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Zhou R, Wu D, Ma J, Ruan L, Feng Y, Ban C, Zhou K, Cai S, Gan LY, Zhou X. Boosting CO 2 piezo-reduction via metal-support interactions in Au/ZnO based catalysts. J Colloid Interface Sci 2024; 661:512-519. [PMID: 38308891 DOI: 10.1016/j.jcis.2024.01.169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 01/17/2024] [Accepted: 01/24/2024] [Indexed: 02/05/2024]
Abstract
Confronting the challenge of climate change necessitates innovative approaches for the reduction of CO2 emissions. Metal-support interaction has been widely demonstrated to enable greatly improved performances in thermal-catalytic, photocatalytic and electrocatalytic CO2 reduction. However, its applicability and specifically its role in the emerging piezo-electrocatalytic CO2 reduction are unknown, severely hampering the utilizations of piezo-electrocatalysis in CO2 conversion. Herein, by adopting Au particles supported on ZnO (Au/ZnO) as a paradigm, it is found that the metal-support interaction can remarkably improve the separation and transfer of piezo-carriers and enhance CO2 adsorption. As a result, Au/ZnO demonstrates a substantially boosted activity for piezo-electrocatalytic CO2 reduction and the optimal sample exhibits a 37.3% increase in CO yield compared to the pristine ZnO. The integration of metal-support interactions opens a new avenue to the design of advanced piezo-electrocatalysts for CO2 reduction.
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Affiliation(s)
- Rundong Zhou
- Corpus Christi College, University of Cambridge, Cambridgeshire CB2 1RH, United Kingdom
| | - Di Wu
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China
| | - Jiangping Ma
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China
| | - Lujie Ruan
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China
| | - Yajie Feng
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China
| | - Chaogang Ban
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China
| | - Kai Zhou
- Analytical and Testing Center, Chongqing University, Chongqing 401331, China
| | - Songjiang Cai
- Chongqing DEPU Foreign Language School, Chongqing 401320, China
| | - Li-Yong Gan
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China.
| | - Xiaoyuan Zhou
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China; Analytical and Testing Center, Chongqing University, Chongqing 401331, China.
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2
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Lei YM, Wu D, Pan MC, Tao XL, Zeng WJ, Gan LY, Chai YQ, Yuan R, Zhuo Y. Dynamic surface reconstruction of individual gold nanoclusters by using a co-reactant enables color-tunable electrochemiluminescence. Chem Sci 2024; 15:3255-3261. [PMID: 38425534 PMCID: PMC10901519 DOI: 10.1039/d3sc06148e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 01/13/2024] [Indexed: 03/02/2024] Open
Abstract
Here we report for the first time the phenomenon of continuously color-tunable electrochemiluminescence (ECL) from individual gold nanoclusters (Au NCs) confined in a porous hydrogel matrix by adjusting the concentration of the co-reactant. Specifically, the hydrogel-confined Au NCs exhibit strong dual-color ECL in an aqueous solution with triethylamine (TEA) as a co-reactant, with a record-breaking quantum yield of 95%. Unlike previously reported Au NCs, the ECL origin of the hydrogel-confined Au NCs is related to both the Au(0) kernel and the Au(i)-S surface. Surprisingly, the surface-related ECL of Au NCs exhibits a wide color-tunable range of 625-829 nm, but the core-related ECL remains constant at 489 nm. Theoretical and experimental studies demonstrate that the color-tunable ECL is caused by the dynamic surface reconstruction of Au NCs and TEA radicals. This work opens up new avenues for dynamically manipulating the ECL spectra of core-shell emitters in biosensing and imaging research.
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Affiliation(s)
- Yan-Mei Lei
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University Chongqing 400715 China
- Institute of Molecular Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University Shanghai 200127 China
| | - Di Wu
- College of Physics and Center of Quantum Materials and Devices, Chongqing University Chongqing 401331 China
| | - Mei-Chen Pan
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University Chongqing 400715 China
| | - Xiu-Li Tao
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University Chongqing 400715 China
| | - Wei-Jia Zeng
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University Chongqing 400715 China
| | - Li-Yong Gan
- College of Physics and Center of Quantum Materials and Devices, Chongqing University Chongqing 401331 China
| | - Ya-Qin Chai
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University Chongqing 400715 China
| | - Ruo Yuan
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University Chongqing 400715 China
| | - Ying Zhuo
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University Chongqing 400715 China
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Zhang M, Cao A, Xiang Y, Ban C, Han G, Ding J, Gan LY, Zhou X. Strongly Coupled Ag/Sn-SnO 2 Nanosheets Toward CO 2 Electroreduction to Pure HCOOH Solutions at Ampere-Level Current. Nanomicro Lett 2023; 16:50. [PMID: 38091129 PMCID: PMC10719210 DOI: 10.1007/s40820-023-01264-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 10/25/2023] [Indexed: 12/17/2023]
Abstract
Electrocatalytic reduction of CO2 converts intermittent renewable electricity into value-added liquid products with an enticing prospect, but its practical application is hampered due to the lack of high-performance electrocatalysts. Herein, we elaborately design and develop strongly coupled nanosheets composed of Ag nanoparticles and Sn-SnO2 grains, designated as Ag/Sn-SnO2 nanosheets (NSs), which possess optimized electronic structure, high electrical conductivity, and more accessible sites. As a result, such a catalyst exhibits unprecedented catalytic performance toward CO2-to-formate conversion with near-unity faradaic efficiency (≥ 90%), ultrahigh partial current density (2,000 mA cm-2), and superior long-term stability (200 mA cm-2, 200 h), surpassing the reported catalysts of CO2 electroreduction to formate. Additionally, in situ attenuated total reflection-infrared spectra combined with theoretical calculations revealed that electron-enriched Sn sites on Ag/Sn-SnO2 NSs not only promote the formation of *OCHO and alleviate the energy barriers of *OCHO to *HCOOH, but also impede the desorption of H*. Notably, the Ag/Sn-SnO2 NSs as the cathode in a membrane electrode assembly with porous solid electrolyte layer reactor can continuously produce ~ 0.12 M pure HCOOH solution at 100 mA cm-2 over 200 h. This work may inspire further development of advanced electrocatalysts and innovative device systems for promoting practical application of producing liquid fuels from CO2.
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Affiliation(s)
- Min Zhang
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, People's Republic of China
| | - Aihui Cao
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS), Fuzhou, 350002, People's Republic of China
| | - Yucui Xiang
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, People's Republic of China
| | - Chaogang Ban
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, People's Republic of China
| | - Guang Han
- College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, People's Republic of China.
- Institute of New Energy Storage Materials and Equipment, Chongqing, 401135, People's Republic of China.
| | - Junjie Ding
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, People's Republic of China
| | - Li-Yong Gan
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, People's Republic of China.
- Institute of New Energy Storage Materials and Equipment, Chongqing, 401135, People's Republic of China.
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China.
| | - Xiaoyuan Zhou
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, People's Republic of China.
- Institute of New Energy Storage Materials and Equipment, Chongqing, 401135, People's Republic of China.
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China.
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Ma J, Xiong X, Wu D, Wang Y, Ban C, Feng Y, Meng J, Gao X, Dai JY, Han G, Gan LY, Zhou X. Band Position-Independent Piezo-Electrocatalysis for Ultrahigh CO 2 Conversion. Adv Mater 2023; 35:e2300027. [PMID: 36876444 DOI: 10.1002/adma.202300027] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 02/18/2023] [Indexed: 05/26/2023]
Abstract
Piezo-electrocatalysis as an emerging mechano-to-chemistry energy conversion technique opens multiple innovative opportunities and draws great interest over the past decade. However, the two potential mechanisms in piezo-electrocatalysis, i.e., screening charge effect and energy band theory, generally coexist in the most piezoelectrics, making the essential mechanism remain controversial. Here, for the first time, the two mechanisms in piezo-electrocatalytic CO2 reduction reaction (PECRR) is distinguished through a narrow-bandgap piezo-electrocatalyst strategy using MoS2 nanoflakes as demo. With conduction band of -0.12 eV, the MoS2 nanoflakes are unsatisfied for CO2 -to-CO redox potential of -0.53 eV, yet they achieve an ultrahigh CO yield of ≈543.1 µmol g-1 h-1 in PECRR. Potential band position shifts under vibration are still unsatisfied with CO2 -to-CO potential verified by theoretical investigation and piezo-photocatalytic experiment, further indicating that the mechanism of piezo-electrocatalysis is independent of band position. Besides, MoS2 nanoflakes exhibit unexpected intense "breathing" effect under vibration and enable the naked-eye-visible inhalation of CO2 gas, independently achieving the complete carbon cycle chain from CO2 capture to conversion. The CO2 inhalation and conversion processes in PECRR are revealed by a self-designed in situ reaction cell. This work brings new insights into the essential mechanism and surface reaction evolution of piezo-electrocatalysis.
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Affiliation(s)
- Jiangping Ma
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, China
| | - Xin Xiong
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, China
| | - Di Wu
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, China
| | - Yang Wang
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, China
| | - Chaogang Ban
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, China
| | - Yajie Feng
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, China
| | - Jiazhi Meng
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, China
| | - Xingsen Gao
- Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, China
| | - Ji-Yan Dai
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, 999077, China
| | - Guang Han
- College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China
- Institute of Emerging Energy Storage Materials and Equipment, Chongqing, 401135, China
| | - Li-Yong Gan
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, China
- Institute of Emerging Energy Storage Materials and Equipment, Chongqing, 401135, China
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China
| | - Xiaoyuan Zhou
- College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing, 401331, China
- Institute of Emerging Energy Storage Materials and Equipment, Chongqing, 401135, China
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China
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Huang X, Wang J, Zhao C, Gan LY, Xu H. NiO Matrix Decorated by Ru Single Atoms: Electron-Rich Ru-Induced High Activity and Selectivity toward Electrochemical N 2 Reduction. J Phys Chem Lett 2023; 14:3785-3793. [PMID: 37052489 DOI: 10.1021/acs.jpclett.3c00372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Developing a single-atom catalyst with electron-rich active sites is a promising strategy for catalyzing the electrochemical N2 reduction reaction (NRR). Herein, we choose NiO(001) as a model template and deposit a series of single transition metal (TM) atoms with higher formal charges to create the electron-rich active centers. Our first-principles calculations show that low-valent Ru (+2) on NiO(001) can significantly activate N2, with its oxidation states varying from +2 to +4 throughout the catalytic cycle. The Ru/NiO(001) catalyst exhibits the best activity with a relatively low limiting potential of -0.49 V. Furthermore, under NRR operating conditions, the Ru site is primarily occupied by *N2 rather than *H, indicating that NRR overwhelms the hydrogen evolution reaction and thus exhibits excellent selectivity. Our work highlights the potential of designing catalysts with electron-rich active sites for NRR.
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Affiliation(s)
- Xiang Huang
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jiong Wang
- Innovation Center for Chemical Sciences, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Changming Zhao
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Li-Yong Gan
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400030, China
| | - Hu Xu
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Guangdong Provincial Key Laboratory of Computational Science and Material Design, Southern University of Science and Technology, Shenzhen 518055, China
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6
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Wang Y, Zhu L, Yang B, Gan LY, Zuo L. [Changes of serum calcium and bone turnover markers in maintenance hemodialysis patients treated with denosumab]. Zhonghua Yi Xue Za Zhi 2023; 103:594-597. [PMID: 36822871 DOI: 10.3760/cma.j.cn112137-20220913-01935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
A total of 20 patients (8 males and 12 females) aged (64.8±13.9) years who underwent regular hemodialysis and had bone loss or osteoporosis in Peking University People's Hospital from July to December 2021 were recruited. Sixty milligrams of denosumab were given subcutaneously. The average serum calcium decreased by 0.31 mmol/L and 40% (8/20) of the patients had hypocalcemia one month after treatment. The markers of bone turnover began to decrease 3 days after treatment, and continued to decrease until 5 months after denosumab medication. Multivariate logistic regression analysis failed to detect any independent risk factor for hypocalcemia (R2=0.516, P=0.021). Therefore, denosumab can significantly inhibit bone turnover in hemodialysis patients, however, patients with denosumab medication are more prone to hypocalcemia.
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Affiliation(s)
- Y Wang
- Department of Nephrology, Peking University People's Hospital, Beijing 100044, China
| | - L Zhu
- Department of Nephrology, Peking University People's Hospital, Beijing 100044, China
| | - B Yang
- Department of Nephrology, Peking University People's Hospital, Beijing 100044, China
| | - L Y Gan
- Department of Nephrology, Peking University People's Hospital, Beijing 100044, China
| | - L Zuo
- Department of Nephrology, Peking University People's Hospital, Beijing 100044, China
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Huang X, Wang J, Zhao C, Gan LY, Xu H. The surface charge induced high activity of oxygen reduction reaction on the PdTe 2 bilayer. Phys Chem Chem Phys 2023; 25:4105-4112. [PMID: 36651805 DOI: 10.1039/d2cp05772g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Developing transition metal dichalcogenides as electrocatalysts has attracted great interest due to their tunable electronic properties and good thermal stabilities. Herein, we propose a PdTe2 bilayer as a promising electrocatalyst candidate towards the oxygen reduction reaction (ORR), based on extensive investigation of the electronic properties of PdTe2 thin films as well as atomic-level reaction kinetics at explicit electrode potentials. We verify that under electrochemical reducing conditions, the electron emerging on the electrode surface is directly transferred to O2 adsorbed on the PdTe2 bilayer, which greatly reduces the dissociation barrier of O2, and thereby facilitates the ORR to proceed via a dissociative pathway. Moreover, the barriers of the electrochemical steps in this pathway are all found to be less than 0.1 eV at the ORR limiting potential, demonstrating fast ORR kinetics at ambient conditions. This unique mechanism offers excellent energy efficiency and four-electron selectivity for the PdTe2 bilayer, and it is identified as a promising candidate for fuel cell applications.
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Affiliation(s)
- Xiang Huang
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.
| | - Jiong Wang
- Innovation Center for Chemical Sciences, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Changming Zhao
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.
| | - Li-Yong Gan
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400030, China
| | - Hu Xu
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China. .,Guangdong Provincial Key Laboratory of Computational Science and Material Design, Southern University of Science and Technology, Shenzhen 518055, China.,Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
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8
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Kong W, Xiao X, Zhan F, Wang R, Gan LY, Wei J, Fan J, Wu X. A carbon allotrope with twisted Dirac cones induced by grain boundaries composed of pentagons and octagons. Phys Chem Chem Phys 2023; 25:4230-4235. [PMID: 36661111 DOI: 10.1039/d2cp05271g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The grain boundaries (GBs) composed of pentagons and octagons (558 GBs) have been demonstrated to induce attractive transport properties such as Van Hove singularity (VHS) and quasi-one-dimensional metallic wires. Here, we propose a monolayer carbon allotrope which is formed from the introduction of periodic 558 GBs to decorate intact graphene, termed as PHO-graphene. The calculated electronic properties indicate that PHO-graphene not only inherits the previously superior characteristics such as Van Hove singularity and quasi-one-dimensional metallic wires, but also possesses two twisted Dirac cones near the Fermi level. Further calculation finds that the Berry phase is quantized to ± π at the two Dirac points, which is consistent with the distribution of the corresponding Berry curvature. The parity argument uncovers that PHO-graphene hosts a nontrivial band topology and the edge states connecting the two Dirac points are clearly visible. Our findings not only provide a reliable avenue to realize the abundant and extraordinary properties of carbon allotropes, but also offer an attractive approach for designing all carbon-based devices.
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Affiliation(s)
- Weixiang Kong
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 401331, People's Republic of China.
| | - Xiaoliang Xiao
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 401331, People's Republic of China.
| | - Fangyang Zhan
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 401331, People's Republic of China.
| | - Rui Wang
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 401331, People's Republic of China.
| | - Li-Yong Gan
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 401331, People's Republic of China.
| | - Juan Wei
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 401331, People's Republic of China.
| | - Jing Fan
- Center for Computational Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
| | - Xiaozhi Wu
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 401331, People's Republic of China.
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Abstract
Two-dimensional (2D) boron nitride (BN) is a promising candidate for aerospace materials due to its excellent mechanical and thermal stability properties. However, its unusually prominent band gap limits its application prospects. In this work, we report a gapless monolayer BN, t-BN, which has four anisotropic Dirac cones in the first Brillouin zone exactly at the Fermi level. To further confirm the semimetallic character, the nontrivial topological properties are proven through the topologically protected edge states and the invariant non-zero Z2. Additionally, the Young's modulus and Poisson ratio characterize the strong mechanical strength of t-BN. Our theoretical predictions provide more possibilities for exploring the Dirac cone in BN, which will enhance the 2D boron derivative materials.
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Affiliation(s)
- Juan Wei
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Weixiang Kong
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Xiaoliang Xiao
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Rui Wang
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Li-Yong Gan
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Jing Fan
- Center for Computational Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
| | - Xiaozhi Wu
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
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Wang XQ, Gan LY, Ma J, Zhong Y. [Observation of microstructure and vessel density changes in the superficial retinal layer in buried optic disc drusen patients]. Zhonghua Yan Ke Za Zhi 2022; 58:200-204. [PMID: 35280028 DOI: 10.3760/cma.j.cn112142-20210328-00144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Objective: To investigate the changes of the microstructure and vascular density in the superficial retinal layer of buried optic disc drusen (ODD) patients. Methods: Retrospective case-control study. A total of 36 ODD eyes (20 patients) and 26 normal control eyes were recruited in Beijing Union Medical College Hospital from January 2018 to July 2020. Measurement of best corrected visual acuity (BCVA), intraocular pressure, slit lamp, fundus examination and visual field examination were performed. The images and data of spectral domain-optical coherence tomography (SD-OCT) and optical coherence tomography angiography (OCTA) were analyzed and summarized. The differences of nasal retinal nerve fiber layer (RNFL), ganglion cell complex (GCC) thickness and macular superficial vascular density (VD) between ODD patients and normal controls were compared by independent sample t-test or Mann Whitney U test (the right eye was selected in bilateral ODD patients). Results: The 20 ODD patients and 26 normal controls were all female. There was no significant difference in age between the two groups (P>0.05). The BCVA and visual field examination was normal in all ODD patients. The SD-OCT examination showed an oval low signal shadow under the nasal outer nuclear layer of the optic disc, or local accumulation like a medium signal shadow with a clear boundary, and a high signal capsule in ODD patients. The RNFL in the upper nasal side of the ODD group was significantly different from the normal control group [(102.6±19.1) μm vs. (119.0±13.8) μm; t=-2.81; P<0.01]. Compared with normal control group [101.0 (100.0, 102.0) μm], the average GCC thickness in the ODD group [97.0 (89.3, 99.8) μm] was significantly different (U=48.50; P<0.01). The OCTA en-face scan showed that the vascular network in the macular area of the affected eyes was sparser than that of the control eyes. There was significant difference in superficial macular VD beteeen the ODD group (48.5%±2.8%) and the control group (51.0%±2.3%) (t=-2.63; P<0.05). Conclusions: There is thinning in the RNFL upper nasal side and GCC layer of the macular region in buried ODD patients, and the superficial VD of the macular region in buried ODD patients is lower than that in the normal controls.
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Affiliation(s)
- X Q Wang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - L Y Gan
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - J Ma
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Y Zhong
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
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Rao Q, Hu FX, Gan LY, Guo C, Liu Y, Zhang C, Chen C, Yang HB, Li CM. Boron-Nitrogen-Co-Doping Nanocarbons to Create Rich Electroactive Defects toward Simultaneous Sensing Hydroquinone and Catechol. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2021.139427] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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12
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Kong W, Xiao X, Xu W, Wang R, Gan LY, Wei J, Fan J, Wu X. The Dirac cone in two-dimensional tetragonal silicon carbides: a ring coupling mechanism. Nanoscale 2021; 13:18267-18272. [PMID: 34714316 DOI: 10.1039/d1nr04586e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The exploration of novel two-dimensional semimetallic materials is always an attractive topic. We propose a series of two-dimensional silicon carbides with a tetragonal lattice. The band structure of silicon carbides with tetragonal carbon rings and silicon rings exhibits Dirac cones. Interestingly, the Dirac cone of tetragonal SiC originates from a "ring coupling" mechanism. This mechanism refers to the mutual coupling between the four carbon atoms in the tetragonal C ring, and the same coupling in the tetragonal Si ring. Additionally, the "ring coupling" mechanism is applicable to other group IV binary compounds such as monolayer GeC and SnC. This work provides reliable evidence for the argument that two-dimensional tetragonal materials can produce Dirac cones.
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Affiliation(s)
- Weixiang Kong
- Department of Physics, Chongqing University, Chongqing 401331, P. R. China.
| | - Xiaoliang Xiao
- Department of Physics, Chongqing University, Chongqing 401331, P. R. China.
| | - Wangping Xu
- Department of Physics, Chongqing University, Chongqing 401331, P. R. China.
| | - Rui Wang
- Department of Physics, Chongqing University, Chongqing 401331, P. R. China.
| | - Li-Yong Gan
- Department of Physics, Chongqing University, Chongqing 401331, P. R. China.
| | - Juan Wei
- Department of Physics, Chongqing University, Chongqing 401331, P. R. China.
| | - Jing Fan
- Center for Computational Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
| | - Xiaozhi Wu
- Department of Physics, Chongqing University, Chongqing 401331, P. R. China.
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Kong W, Wang R, Xiao X, Zhan F, Gan LY, Wei J, Fan J, Wu X. Dirac Fermions in Graphene with Stacking Fault Induced Periodic Line Defects. J Phys Chem Lett 2021; 12:10874-10879. [PMID: 34730356 DOI: 10.1021/acs.jpclett.1c02996] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The exploration of carbon phases with intact massless Dirac fermions in the presence of defects is critical for practical applications to nanoelectronics. Here, we identify by first-principles calculations that the Dirac cones can exist in graphene with stacking fault (SF) induced periodic line defects. These structures are width (n)-dependent to graphene nanoribbon and are thus termed as (SF)n-graphene. The electronic properties reveal that the semimetallic features with Dirac cones occur in (SF)n-graphene with n = 3m + 1, where m is a positive integer, and then lead to a quasi-one-dimensional conducting channel. Importantly, it is found that the twisted Dirac cone in the (SF)4-graphene is tunable among type-I, type-II, and type-III through a small uniaxial strain. The further stability analysis shows that (SF)n-graphene is thermodynamic stable. Our findings provide an artificial avenue for exploring Dirac Ffermions in carbon-allotropic structures in the presence of defects.
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Affiliation(s)
- Weixiang Kong
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Rui Wang
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Xiaoliang Xiao
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Fangyang Zhan
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Li-Yong Gan
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Juan Wei
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
| | - Jing Fan
- Center for Computational Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
| | - Xiaozhi Wu
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, People's Republic of China
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Huang X, Gan LY, Wang J, Ali S, He CC, Xu H. Developing Proton-Conductive Metal Coordination Polymer as Highly Efficient Electrocatalyst toward Oxygen Reduction. J Phys Chem Lett 2021; 12:9197-9204. [PMID: 34528786 DOI: 10.1021/acs.jpclett.1c02665] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Developing earth-abundant transition metal (TM)-based electrocatalysts toward oxygen reduction reaction (ORR) is significant in overcoming the high cost of fuel cells. Herein, using an as-synthesized proton-conductive coordination polymer (termed TM-DHBQ) as a template, we investigate the ORR performance of a series of such TM-DHBQs via screening 3d, 4d, and 5d TMs. We find that most 3d TM-DHBQs exhibit distinguished durability under ORR turnover conditions. The formation energies of these TM-DHBQs and adsorption free energies of ORR intermediates show a good correlation with the number of outer electrons of TM ions in TM-DHBQs, enabling the formation energy as a robust ORR activity descriptor. The Sabatier-type volcano plot and microkinetic modeling coidentify Fe- and Co-DHBQs as two promising alternatives to Pt-based ORR electrocatalysts. For those TM-DHBQs showing strong bonding to oxygen species, the ORR intermediate is found to combine with the TM ion serving as the active center.
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Affiliation(s)
- Xiang Huang
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Li-Yong Gan
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400030, China
| | - Jiong Wang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Sajjad Ali
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Chang-Chun He
- Department of Physics, South China University of Technology, Guangzhou 510640, China
| | - Hu Xu
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Guangdong Provincial Key Laboratory of Computational Science and Material Design, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
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15
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Zou H, Liu X, Wang K, Duan Y, Wang C, Zhang B, Zhou K, Yu D, Gan LY, Zhou X. Constructing highly active Co sites in Prussian blue analogues for boosting electrocatalytic water oxidation. Chem Commun (Camb) 2021; 57:8011-8014. [PMID: 34286711 DOI: 10.1039/d1cc02224e] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
High-valence cobalt sites are considered as highly active centers for the oxygen evolution reaction (OER) and their corresponding construction is thus of primary importance in the pursuit of outstanding performance. Herein, we report the design and facile synthesis of abundant high-valence cobalt sites by introducing Zn2+ into CoFe Prussian blue analogues (PBAs). The modification results in the drastic morphological transformation from a pure phase (CoFe-PBA) to a three-phase composite (CoFeZn-PBA), with a significant increase not only the amount of highly oxidized Co sites but the specific surface area (by up to 4 times). Moreover, the obtained sample also exhibits outstanding electric conductivity. Consequently, an excellent OER performance with an overpotential of 343 mV@10 mA cm-2 and a Tafel slope of 75 mV dec-1 was achieved in CoFeZn-PBA, which outperforms the commercial IrO2 catalyst. Further analysis reveals that CoFeZn-PBA becomes (oxyhydr)oxides after the OER.
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Affiliation(s)
- Hanjun Zou
- College of Physics and State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 401331, China.
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Huang X, Wang J, Gao J, Zhang Z, Gan LY, Xu H. Structural Evolution and Underlying Mechanism of Single-Atom Centers on Mo 2C(100) Support during Oxygen Reduction Reaction. ACS Appl Mater Interfaces 2021; 13:17075-17084. [PMID: 33787216 DOI: 10.1021/acsami.1c01477] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The single-metal atoms coordinating with the surface atoms of the support constitute the active centers of as-prepared single-atom catalysts (SACs). However, under hash electrochemical conditions, (1) supports' surfaces may experience structural change, which turn to be distinct from those at ambient conditions; (2) during catalysis, the dynamic responses of a single atom to the attack of reaction intermediates likely change the coordination environment of a single atom. These factors could alter the performance of SACs. Herein, we investigate these issues using Mo2C(100)-supported single transition-metal (TM) atoms as model SACs toward catalyzing the oxygen reduction reaction (ORR). It is found that the Mo2C(100) surface is oxidized under ORR turnover conditions, resulting in significantly weakened bonding between single TM atoms and the Mo2C(100) surface (TM@Mo2C(100)_O* term for SAC). While the intermediate in 2 e- ORR does not change the local structures of the active centers in these SACs, the O* intermediate emerging in 4 e- ORR can damage Rh@ and Cu@Mo2C(100)_O*. Furthermore, on the basis of these findings, we propose Pt@Mo2C(100)_O* as a qualified ORR catalyst, which exhibits extraordinary 4 e- ORR activity with an overpotential of only 0.33 V, surpassing the state-of-the-art Pt(111), and thus being identified as a promising alternative to the commercial Pt/C catalyst.
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Affiliation(s)
- Xiang Huang
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jiong Wang
- Institute of Advanced Synthesis (IAS), School of Chemistry and Chemical Engineering, Northwestern Polytechnical University (NPU), Xi'an 710072, China
- Yangtze River Delta Research Institute of NPU, Taicang Jiangsu, 215400, China
| | - Jiajian Gao
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Zhe Zhang
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Li-Yong Gan
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400030, China
| | - Hu Xu
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Guangdong Provincial Key Laboratory of Computational Science and Material Design, Southern University of Science and Technology, Shenzhen 518055, China
- Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
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Cui JJ, Zhang MM, Luo MY, Gan LY, Yang JY, Xie HY, Kang WJ, Zhao JL. [Veracity of using a visual chart with a testing distance of 2.5 meters for measurement of distance visual acuity in teenagers]. Zhonghua Yan Ke Za Zhi 2021; 57:122-125. [PMID: 33541053 DOI: 10.3760/cma.j.cn112142-20200429-00296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Objective: To compare the results of visual acuity testing for teenagers with visual acuity charts designed at 2.5-meter and 5-meter distances, and to investigate the accuracy of the 2.5-meter visual acuity chart. Methods: It was a self-control study. A total of 227 teenagers (454 eyes) with ametropia who came to the ophthalmic clinic of Peking Union Medical College Hospital from March 2019 to September 2019 were included. There were 123 males and 104 females aged (11.74±3.26) years. The vision examiners were trained in the same testing environment and passed the consistency test. Distance visual acuity of all participants was tested with charts designed at 2.5 meters and 5 meters in a 10-minute interval. According to the age (7-9, 10-12, 13-15 and 16-18 years old) and visual acuity (1.00-0.52, 0.40-0.30 and 0.22-0.10), the results of two kinds of visual acuity charts were compared. The testing order of the two visual charts was randomly determined. The visual acuity results were converted into logMAR values and compared. Paried t-student test was used to compare the difference between two charts, and Pearson correlation test was used to explore the correlation between the results of two charts. Results: The visual acuity of the right eye was 0.37±0.24 (logMAR) at 2.5 meters and 0.50±0.26 (logMAR) at 5 meters. The distance visual acuity measured with the 2.5-meter visual acuity chart was better (t=16.19, P<0.01). The visual acuity of the left eye was 0.36±0.23 (logMAR) at 2.5 meters and 0.45±0.23 (logMAR) at 5 meters (t=11.71, P<0.01). The differences between two charts were larger among teenagers with lower visual acuity (r=0.387,P<0.01). Conclusion: Under the same test conditions, the distance visual acuity measured with a 2.5-meter chart was significantly better than a 5-meter chart. The visual acuity chart designed at 2.5 meters was not an appropriate tool to measure distance vision in adolescents. (Chin J Ophthalmol, 2021, 57: 122-125).
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Affiliation(s)
- J J Cui
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - M M Zhang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - M Y Luo
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - L Y Gan
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - J Y Yang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - H Y Xie
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - W J Kang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - J L Zhao
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
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18
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Wang YH, Ma J, Li H, Xu HY, Gan LY, Zhang X, Wang XQ, Zhong Y. [Peripapillary and macular vessel density in eyes with different phases of thyroid-associated ophthalmopathy]. Zhonghua Yan Ke Za Zhi 2020; 56:824-831. [PMID: 33152840 DOI: 10.3760/cma.j.cn112142-20191115-00574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To analyze the characteristics of vessel density in the optic disc and macular area of patients with different phases of thyroid-associated ophthalmopathy (TAO) and their correlation with visual function. Methods: This case-control study was conducted at the Department of Ophthalmology of Peking Union Medical College Hospital between June 2019 and September 2019. TAO patients and healthy volunteers were included in the study. Patients with a clinical activity score greater than or equal to 3 points were categorized as active TAO. Dysthyroid optic neuropathy (DON) patients with a course less than 6 months were categorized as acute phase of DON, and those more than 6 months were in the chronic group. Healthy volunteers were in the control group. Each group included 12 subjects, with right eyes for analysis. There were 6 males and 6 females in each group. All participants underwent comprehensive ophthalmic examination including best corrected visual acuity and visual field examination for the mean defect (MD). Best corrected visual acuity was subsequently converted to logarithm of minimum angle of resolution (logMAR). Optical coherence tomography was used to measure the thickness of the retinal nerve fiber layer (RNFL) and retinal ganglion cell complex (GCC). Optical coherence tomography angiography was used to the peripapillary and macular vessel density. The differences in the vessel densities in the optic disc and macular area between groups and their correlation with different factors were analyzed. Analysis of variance, non-parametric Mann-Whitney U test and Spearman coefficient were conducted for statistical analysis. Results: There was no significant difference in age among the four groups (P>0.05). The logMAR of the acute DON group was 0.1 (0.0, 0.2), worse than the control group, which was 0.0 (0.0, 0.0) (U=114.000, P<0.05). The overall vessel densities of the optic disc in acute DON and chronic DON were significantly lower than the control group (54.70%±2.31% and 54.31%±3.65% vs. 57.54%±2.17%; t=3.104, 2.636; both P<0.05). The overall superficial vessel densities of the macular area in active TAO, acute DON and chronic DON were significantly lower than the control group (46.07%±3.06% and 42.26%±5.05% and 45.63%±3.87% vs. 49.34%±3.08%), and the differences were statistically significant (t=2.614, 4.147, 2.603; all P<0.05). There was no statistically significant difference in the size of the foveal avascular zone or the density of deep blood vessels in the macular area among the four groups (all P>0.05). In the active TAO period, there was no correlation between the MD value, RNFL thickness, GCC thickness and the vessel densities of the optic disc and macular area (all P>0.05). The vascular density of the whole layer of the optic disc in acute DON was negatively correlated with the MD value (r=-0.591, P<0.05) and positively correlated with the RNFL thickness and GCC thickness (r=0.595, 0.693; both P<0.05). In chronic DON, the overall capillary density of the optic disc was negatively correlated with the MD value (r=-0.673, P<0.05); the superficial overall blood vessel density of the macular area was positively correlated with the thickness of RNFL and GCC (r=0.732, 0.712;both P<0.01). Conclusions: In active TAO, only the blood supply to the superficial layer of the macular area is decreased. In the acute and chronic phases of DON, the blood supply to the superficial layer of the macular area and the optic disc is both reduced; the smaller the blood vessel density, the more severe the visual field defect, and the thinner the RNFL and GCC. (Chin J Ophthalmol, 2020, 56:824-831).
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Affiliation(s)
- Y H Wang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, ChinaWang Yuhan is now working at Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - J Ma
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, ChinaWang Yuhan is now working at Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - H Li
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, ChinaWang Yuhan is now working at Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - H Y Xu
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, ChinaWang Yuhan is now working at Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - L Y Gan
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, ChinaWang Yuhan is now working at Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - X Zhang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, ChinaWang Yuhan is now working at Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - X Q Wang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, ChinaWang Yuhan is now working at Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - Y Zhong
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, ChinaWang Yuhan is now working at Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
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Li CC, Wang B, Chen D, Gan LY, Feng Y, Zhang Y, Yang Y, Geng H, Rui X, Yu Y. Topotactic Transformation Synthesis of 2D Ultrathin GeS 2 Nanosheets toward High-Rate and High-Energy-Density Sodium-Ion Half/Full Batteries. ACS Nano 2020; 14:531-540. [PMID: 31846288 DOI: 10.1021/acsnano.9b06855] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Currently, development of metal sulfide anodes for sodium-ion batteries (SIBs) with high capacity, fast charging/discharging, and good cycling performance continues to present a great challenge. Hence, a topochemical conversion strategy is reported to fabricate 2D ultrathin GeS2 nanosheets (thickness: ∼1.2 nm) as the potential anodes for sodium storage. The 2D ultrathin nanostructure can mitigate the electrode-electrolyte contact issue faced by bulk material and provide shorter transport/diffusion pathways for Na ions and electrons, resulting in excellent rate performance. Impressively, ultrathin GeS2 nanosheets can bring a large capacity of 515 mAh g-1 even after 2000 cycles under 10 A g-1. Additionally, as revealed by calculations and in situ/ex situ technique analysis, a favorable mechanism of Na+ intercalation/deintercalation into/from the GeS2 interlayer region (GeS2 ↔ NaxGeS2) is demonstrated. Furthermore, when coupled with the advanced cathode of Na3V2(PO4)2O2F, the sodium-ion full cell shows a stable high energy density (213 Wh kg-1), which makes our ultrathin GeS2 nanosheets a promising candidate for SIBs.
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Affiliation(s)
- Cheng Chao Li
- School of Chemical Engineering and Light Industry , Guangdong University of Technology , Guangzhou 510006 , China
| | - Bo Wang
- School of Chemical Engineering and Light Industry , Guangdong University of Technology , Guangzhou 510006 , China
| | - Dong Chen
- Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Collaborative Innovation Center of Advanced Energy Materials, School of Materials and Energy , Guangdong University of Technology , Guangzhou 510006 , China
| | - Li-Yong Gan
- Institute for Structure and Function and Department of Physics , Chongqing University , Chongqing 400030 , China
| | - Yuezhan Feng
- Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education , Zhengzhou University , Zhengzhou 450002 , China
| | - Yufei Zhang
- School of Chemical Engineering and Light Industry , Guangdong University of Technology , Guangzhou 510006 , China
| | - Yang Yang
- School of Chemical Engineering and Light Industry , Guangdong University of Technology , Guangzhou 510006 , China
| | - Hongbo Geng
- School of Chemical Engineering and Light Industry , Guangdong University of Technology , Guangzhou 510006 , China
| | - Xianhong Rui
- Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Collaborative Innovation Center of Advanced Energy Materials, School of Materials and Energy , Guangdong University of Technology , Guangzhou 510006 , China
| | - Yan Yu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Materials Science and Engineering , University of Science and Technology of China, Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences (CAS) , Hefei , Anhui 230026 , China
- State Key Laboratory of Fire Science , University of Science and Technology of China , Hefei , Anhui 230026 , China
- Dalian National Laboratory for Clean Energy (DNL) , Chinese Academy of Sciences (CAS) , Dalian 116023 , China
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Wang YH, Ma J, Gan LY, Zhang X, Wang XQ, Chou YY, Wang XJ, Sun ZZ, Tao ZY, Zhong Y. [Optic nerve morphology and vessel density in eyes with different phases of non-arteritic anterior ischemic optic neuropathy]. Zhonghua Yan Ke Za Zhi 2019; 55:677-686. [PMID: 31495153 DOI: 10.3760/cma.j.issn.0412-4081.2019.09.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To compare the blood flow around the optic disc and related factors in patients with acute and chronic non-arteritic anterior ischemic optic neuropathy (NAION) and healthy volunteers with small disc cups under the same anatomical structure. Methods: This was a prospective case-control study. NAION patients with unilateral onset and healthy volunteers of the same phase were included in the study conducted at the Department of Ophthalmology of Peking Union Medical College Hospital between February 2017 and September 2018. Patients with a course of ≤ 3 months were categorized in the acute phase of NAION, and those with a course of >3 months were in the chronic phase of NAION. Healthy volunteers were in the control group. All subjects underwent the examination of best corrected visual acuity converted to logarithm of the minimum angle of resolution (LogMAR), measurement of non-contact intraocular pressure, slit lamp examination, small pupil fundus examination, and axial measurement. Optical coherence tomography was used to measure the thickness of retinal nerve fiber layers (RNFL) and retinal ganglion cell complex (GCC). Optical coherence tomography angiography was used to measure the vessel density around the optic disc. NAION patients underwent the visual field examination. Analysis of variance, non-parametric Mann-Whitney U test and Spearman coefficient was used for statistical analysis. Results: This study included 16 patients with acute phase of NAION, aged (57±9) years, 6 males and 10 females. There were 17 patients with chronic disease, aged (56±10) years, 7 males and 10 females. There were 15 healthy controls, aged (57±10) years old, 6 males and 9 females. There were no significant differences in age and gender between the groups (both P>0.05). The RNFL and the GCC in the NAION chronic phase group were significantly thinner than those in the acute phase group [(78±38) μm vs. (191±99) μm, (75±19) μm vs. (98±28) μm; t=4.389, 2.758; both P<0.05]. The cup/disc area ratio, cup/disc vertical diameter ratio and cup/disc horizontal diameter ratio in the chronic phase group were larger than those in the acute phase group [0.18 (0.11, 0.31) vs. 0.05 (0.01, 0.18), 0.45 (0.39, 0.56) vs. 0.22 (0.11, 0.41), 0.39 (0.28, 0.54) vs. 0.20 (0.07, 0.42)], and the difference was statistically significant (U=212.000, 208.000, 205.000; all P<0.05). Compared with the optic disc vessel density in the control group (53%±6%), there was a significant decrease in the acute phase group and the chronic phase group (45%±7%, 41%±8%; t=3.705, 4.940; both P<0.01). The blood vessel density in the nasal inferior of the chronic phase group was significantly lower than that in the acute phase group (36%±8% vs. 42%±7%, P=0.039), other sections didn't have significant difference (all P>0.05). There were tortuous capillaries in 8/16 of the acute phase cases, with a low blood flow density and visual field defect in relative positions. Correlation analysis showed that the whole density and peripapillary density in the NAION patients were negatively correlated with LogMAR, mean visual field defect, cup/disc area ratio, focal loss of volume of GCC and general loss of volume of GCC (r=-0.510, -0.733, -0.372, -0.532, -0.648; all P<0.01), but positively correlated with GCC and RNFL thickness (r=0.604, 0.508; both P<0.01). Conclusions: The optic disc vessel density in the acute phase and chronic phase of NAION is significantly reduced. The vessel density in the nasal area of the chronic phase is significantly reduced compared with the acute phase. The vessel density is correlated with visual acuity, visual field defect, disc indexes, thickness of RNFL and GCC. (Chin J Ophthalmol, 2019, 55: 677-686).
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Affiliation(s)
- Y H Wang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
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Zhang X, Ma J, Wang YH, Gan LY, Li L, Wang XQ, Li DH, Xing B, Feng M, Zhu HJ, Lu L, Feng F, You H, Zhang ZH, Zhong Y. [The correlation of ganglion cell layer thickness with visual field defect in non-functional pituitary adenoma with chiasm compression]. Zhonghua Yan Ke Za Zhi 2019; 55:186-194. [PMID: 30841685 DOI: 10.3760/cma.j.issn.0412-4081.2019.03.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the consequences of the thickness of ganglion cell layer (GCL) and visual field defect of non-functional pituitary adenoma with chiasm compression. Methods: A case control study. The study included 40 (80 eyes) non-functional pituitary adenoma patients in Peking Union Medical College Hospital from March 2015 to February 2017. Twenty patients (no visual field defect group, 40 eyes) of them were detected to be chiasm compressed or touched by the adenoma with no visual field defect detected, and the other 20 patients (visual field defect group, 40 eyes) were the sex-and-age matched pituitary adenoma patients with bitemporal heminopsia. This study also included 20 (control group, 40 eyes) sex-and-age matched healthy controls. The para-papillary retinal nerve fiber layer (RNFL) thickness in 6 quadrants including nasal, temporal, nasal superior, temporal superior, nasal inferior and temporal inferior as well as the macular GCL thickness and ganglion cell-inner plexiform layer (GCIPL) thickness in 4 quadrants including nasal superior, nasal inferior, temporal superior and temporal inferior were measured. The non-parametric test was used to compare the RNFL, GCL and GCIPL thickness among the three groups. Results: The mean age among the three groups was (46±10) years and the difference among the three groups was not significant (P=0.88). The sex ratio of the three groups was 9∶11 (male∶female) and the difference among the three groups was not significant. The mean axial length among the three groups was (23.22±0.90) mm and the difference among the three groups was not significant (P=0.51). The thickness of para-papillary RNFL of temporal superior, temporal, nasal superior, nasal, nasal inferior quadrants and whole circumference was significantly thinner in the visual field defect group than the control group [(129.88±28.64) μm, (63.63±26.84) μm, (88.08±32.16) μm, (50.68±19.99) μm, (92.48±25.06) μm, and (85.00±20.65) μm vs. (141.10±18.95) μm, (79.12±16.78) μm, (113.68±21.28) μm, (69.67±14.23) μm, (117.80±31.32) μm, and (102.80±9.68) μm, t=2.26, 3.06, 4.14, 4.84, 4.25, 4.88, all P<0.05]. In the nasal quadrant, the para-papillary RNFL of the no visual field defect group was significantly thinner compared with the control group [(61.45±9.83) μm vs. (69.67±14.23) μm, t=2.97, P<0.05]. The total GCL thickness was (30.48±5.42) μm in the visual field defect group, (31.35±2.77) μm in the no visual field defect group, thinner than that in the control group [(33.32±2.92) μm, t=2.92, 3.62; both P<0.05]. The total GCIPL thickness showed no significant difference among the three groups (P=0.07). In the superior and inferior temporal quadrants, the GCL and GCIPL thickness showed no significant difference among the three groups (all P>0.05). In the superior and inferior nasal quadrants, the GCL thickness was (29.41±5.97) μm, and (28.47±5.13) μm in the visual field defect group, (31.15±3.27) μm and (30.61±2.96) μm in the no visual field defect group, and (34.23±3.16) μm and (32.97±2.78) μm in the control group. The GCL thickness in the nasal quadrant was thinner in the visual field defect group (t=4.45, 4.82)and the no visual field defect group(t=4.23, 3.63) than in the control group (all P<0.01). However, no significant difference in GCL thickness was detected between the visual field defect group and the no visual field defect group (both P>0.05). In the superior and inferior nasal quadrants, the GCIPL thickness was (54.06±10.50) μm and (51.77±9.18) μm in the visual field defect group, (58.03±4.00) μm and (56.23±5.37) μm in the no visual field defect group, and (62.26±7.11) μm and (59.39±6.64) μm in the control group. The GCIPL thickness was thinner in the nasal quadrant in the visual field defect group than in the control group (t=3.95, 4.20, both P<0.01). Only in the Superior nasal quadrant, the GCIPL was significantly thinner in the no visual field defect group than the control group (t=3.25, P<0.01). Conclusion: The optic GCL may get thinner in pituitary nonfunctional adenoma with chiasm compression patients without the RNFL layer thinning and visual field defect. (Chin J Ophthalmol, 2019, 55: 186-194).
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Affiliation(s)
- X Zhang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - J Ma
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Y H Wang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - L Y Gan
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - L Li
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - X Q Wang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - D H Li
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - B Xing
- Department of Neurosurgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - M Feng
- Department of Neurosurgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - H J Zhu
- Department of Endocrinology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - L Lu
- Department of Endocrinology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - F Feng
- Department of Radiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - H You
- Department of Radiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Z H Zhang
- Department of Radiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Y Zhong
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
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22
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Du YT, Kan X, Yang F, Gan LY, Schwingenschlögl U. MXene/Graphene Heterostructures as High-Performance Electrodes for Li-Ion Batteries. ACS Appl Mater Interfaces 2018; 10:32867-32873. [PMID: 30160474 DOI: 10.1021/acsami.8b10729] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Recently, MXene/graphene heterostructures have been successfully fabricated and found to exhibit outstanding performance as electrodes for Li-ion batteries. However, insights into the mechanism behind the encouraging experimental results are missing. We use first-principles calculations to systematically investigate the electrochemical properties of MXene/graphene heterostructures, choosing Ti2CX2 (X = F, O, and OH) as representative MXenes. Our calculations disclose that the presence of graphene not only avoids restacking effects of MXene layers but also enhances the electric conductivity, Li adsorption strength (while maintaining a high Li mobility), and mechanical stiffness. These favorable attributes collectively lead to the excellent performance of MXene/graphene electrodes observed experimentally. While the Ti2CO2/graphene heterostructure is proposed to be the most promising candidate within the studied materials, the developed comprehensive understanding is of significance also for the future rational design of MXene-based electrodes.
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Affiliation(s)
- Yun-Ting Du
- Key Laboratory of Advanced Technology of Materials (Ministry of Education), Superconductivity and New Energy R&D Center , Southwest Jiaotong University , Chengdu , Sichuan 610031 , China
- School of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Xiang Kan
- Key Laboratory of Advanced Technology of Materials (Ministry of Education), Superconductivity and New Energy R&D Center , Southwest Jiaotong University , Chengdu , Sichuan 610031 , China
| | - Feng Yang
- Key Laboratory of Advanced Technology of Materials (Ministry of Education), Superconductivity and New Energy R&D Center , Southwest Jiaotong University , Chengdu , Sichuan 610031 , China
| | - Li-Yong Gan
- School of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Udo Schwingenschlögl
- Physical Science and Engineering Division (PSE) , King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900 , Saudi Arabia
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23
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Zhang H, Wang W, Zhao H, Zhao L, Gan LY, Guo LH. Facet-Dependent Interfacial Charge Transfer in Fe(III)-Grafted TiO2 Nanostructures Activated by Visible Light. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02075] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hui Zhang
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China
| | - Weimin Wang
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China
- Institute of Environmental and Safety Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China
| | - Huanxin Zhao
- Institute of Environmental and Safety Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China
| | - Lixia Zhao
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China
| | - Li-Yong Gan
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
| | - Liang-Hong Guo
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China
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24
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Chen ZJ, Cao GX, Gan LY, Dai H, Xu N, Zang MJ, Dai HB, Wu H, Wang P. Highly Dispersed Platinum on Honeycomb-like NiO@Ni Film as a Synergistic Electrocatalyst for the Hydrogen Evolution Reaction. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02212] [Citation(s) in RCA: 109] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zheng-Jun Chen
- School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, People’s Republic of China
| | - Guo-Xuan Cao
- School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, People’s Republic of China
| | - Li-Yong Gan
- School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, People’s Republic of China
| | - Hao Dai
- School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, People’s Republic of China
| | - Ning Xu
- School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, People’s Republic of China
| | - Ming-Jie Zang
- School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, People’s Republic of China
| | - Hong-Bin Dai
- School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, People’s Republic of China
| | - Hui Wu
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
| | - Ping Wang
- School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, People’s Republic of China
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25
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Ding Y, Wu R, Abidi IH, Wong H, Liu Z, Zhuang M, Gan LY, Luo Z. Stacking Modes-Induced Chemical Reactivity Differences on Chemical Vapor Deposition-Grown Trilayer Graphene. ACS Appl Mater Interfaces 2018; 10:23424-23431. [PMID: 29916694 DOI: 10.1021/acsami.8b05635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Trilayer graphene (TLG) synthesized by chemical vapor deposition (CVD), in particular the twisted TLG, exhibits sophisticated electronic structures that depend on their stacking modes. Here, we computationally and experimentally demonstrate the chemical reactivity differences of CVD-TLG induced by the stacking modes and corroborated by a photoexcited phenyl-grafting reaction. The experimental results show that the ABA stacking TLGs have the most inert chemical property, yet 30°-30° stacking twisted TLGs are the most active. Further, density functional theory calculations have shown that the chemical reactivity difference can be quantitatively explained by the differences in the number of hot electrons generated in their valence band during irradiation. The activity difference is further verified by the calculated adsorption energy of phenyl on the TLGs. Our work provides insight into the chemistry of TLG and addresses the challenges associated with selective functionalization of TLG with phenyl groups. The understandings developed in this project can also guide the future development of TLG-based functional devices.
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Affiliation(s)
- Yao Ding
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Ruizhe Wu
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Irfan Haider Abidi
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Hoilun Wong
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Zhenjing Liu
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Minghao Zhuang
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Li-Yong Gan
- School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province , South China University of Technology , Guangzhou 510641 , P.R. China
| | - Zhengtang Luo
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
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26
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Qiu YP, Yin H, Dai H, Gan LY, Dai HB, Wang P. Tuning the Surface Composition of Ni/meso-CeO2with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine. Chemistry 2018; 24:4902-4908. [DOI: 10.1002/chem.201705923] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Yu-Ping Qiu
- School of Materials Science and Engineering, Key Laboratory of, Advanced Energy Storage Materials of Guangdong Province; South China University of Technology; Guangzhou 510641 P.R. China
| | - Hui Yin
- School of Materials Science and Engineering, Key Laboratory of, Advanced Energy Storage Materials of Guangdong Province; South China University of Technology; Guangzhou 510641 P.R. China
| | - Hao Dai
- School of Materials Science and Engineering, Key Laboratory of, Advanced Energy Storage Materials of Guangdong Province; South China University of Technology; Guangzhou 510641 P.R. China
| | - Li-Yong Gan
- School of Materials Science and Engineering, Key Laboratory of, Advanced Energy Storage Materials of Guangdong Province; South China University of Technology; Guangzhou 510641 P.R. China
| | - Hong-Bin Dai
- School of Materials Science and Engineering, Key Laboratory of, Advanced Energy Storage Materials of Guangdong Province; South China University of Technology; Guangzhou 510641 P.R. China
| | - Ping Wang
- School of Materials Science and Engineering, Key Laboratory of, Advanced Energy Storage Materials of Guangdong Province; South China University of Technology; Guangzhou 510641 P.R. China
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27
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Din HU, Idrees M, Rehman G, Nguyen CV, Gan LY, Ahmad I, Maqbool M, Amin B. Electronic structure, optical and photocatalytic performance of SiC–MX2 (M = Mo, W and X = S, Se) van der Waals heterostructures. Phys Chem Chem Phys 2018; 20:24168-24175. [DOI: 10.1039/c8cp03933j] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The stacking of monolayers in the form of van der Waals heterostructures is a useful strategy for band gap engineering and the control of dynamics of excitons for potential nano-electronic devices.
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Affiliation(s)
- H. U. Din
- Department of Physics
- Hazara University
- Mansehra 21300
- Pakistan
| | - M. Idrees
- Department of Physics
- Hazara University
- Mansehra 21300
- Pakistan
| | - Gul Rehman
- Department of Physics
- University of Malakand
- Chakdara 18800
- Pakistan
- Center for Computational Materials Science
| | - Chuong V. Nguyen
- Department of Materials Science and Engineering
- Le Quy Don Technical University
- Ha Noi 100000
- Vietnam
| | - Li-Yong Gan
- School of Materials Science and Engineering
- South China University of Technology
- Guangzhou 510641
- China
| | - Iftikhar Ahmad
- Department of Physics
- University of Malakand
- Chakdara 18800
- Pakistan
- Center for Computational Materials Science
| | - M. Maqbool
- Department of Clinical & Diagnostic Sciences
- The University of Alabama at Birmingham
- Birmingham
- USA
| | - B. Amin
- Department of Physics
- Hazara University
- Mansehra 21300
- Pakistan
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28
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Xin Y, Kan X, Gan LY, Zhang Z. Heterogeneous Bimetallic Phosphide/Sulfide Nanocomposite for Efficient Solar-Energy-Driven Overall Water Splitting. ACS Nano 2017; 11:10303-10312. [PMID: 28898052 DOI: 10.1021/acsnano.7b05020] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Solar-driven overall water splitting is highly desirable for hydrogen generation with sustainable energy sources, which need efficient, earth-abundant, robust, and bifunctional electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, we propose a heterogeneous bimetallic phosphide/sulfide nanocomposite electrocatalyst of NiFeSP on nickel foam (NiFeSP/NF), which shows superior electrocatalytic activity of low overpotentials of 91 mV at -10 mA cm-2 for HER and of 240 mV at 50 mA cm-2 for OER in 1 M KOH solution. In addition, the NiFeSP/NF presents excellent overall water splitting performance with a cell voltage as low as 1.58 V at a current density of 10 mA cm-2. Combining with a photovoltaic device of a Si solar cell or integrating into photoelectrochemical (PEC) systems, the bifunctional NiFeSP/NF electrocatalyst implements unassisted solar-driven water splitting with a solar-to-hydrogen conversion efficiency of ∼9.2% and significantly enhanced PEC performance, respectively.
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Affiliation(s)
- Yanmei Xin
- School of Chemistry and Molecular Engineering, East China Normal University , 500 Dongchuan Road, Shanghai 200241, China
| | - Xiang Kan
- Superconductivity and New Energy R&D Center, Southwest Jiaotong University , Chengdu 610031, China
| | - Li-Yong Gan
- Superconductivity and New Energy R&D Center, Southwest Jiaotong University , Chengdu 610031, China
- School of Material Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology , Guangzhou 510641, China
| | - Zhonghai Zhang
- School of Chemistry and Molecular Engineering, East China Normal University , 500 Dongchuan Road, Shanghai 200241, China
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29
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Jin YJ, Wang R, Zhao JZ, Du YP, Zheng CD, Gan LY, Liu JF, Xu H, Tong SY. The prediction of a family group of two-dimensional node-line semimetals. Nanoscale 2017; 9:13112-13118. [PMID: 28849838 DOI: 10.1039/c7nr03520a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Using first-principles calculations, we predict a family group of two-dimensional semimetals MX (M = Pd, Pt; X = S, Se, Te), which has a zig-zag type mono-layer structure in the Pmma (no. 41) layer group. Band structure analysis reveals that node-line features are caused by band inversion and the inversion exists even in the absence of spin-orbital-coupling. First-principles calculations show the robust lattice stability of these predicted materials. This work provides the possibility of making a group of novel two-dimensional materials with semimetal features.
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Affiliation(s)
- Yuan-Jun Jin
- Department of Physics, South University of Science and Technology of China, 518055 Shenzhen, China.
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30
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Li SL, Yin H, Kan X, Gan LY, Schwingenschlögl U, Zhao Y. Potential of transition metal atoms embedded in buckled monolayer g-C3N4 as single-atom catalysts. Phys Chem Chem Phys 2017; 19:30069-30077. [DOI: 10.1039/c7cp05195f] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We use first-principles calculations to systematically explore the potential of transition metal atoms (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Ir, Pt, and Au) embedded in buckled monolayer g-C3N4 as single-atom catalysts.
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Affiliation(s)
- Shu-Long Li
- Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - Hui Yin
- School of Materials Science and Engineering
- South China University of Technology
- Guangzhou 510006
- China
| | - Xiang Kan
- Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - Li-Yong Gan
- Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - Udo Schwingenschlögl
- King Abdullah University of Science and Technology (KAUST)
- Physical Science and Engineering Division (PSE)
- Thuwal 23955-6900
- Saudi Arabia
| | - Yong Zhao
- Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu 610031
- China
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31
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Abstract
Herein, we systematically explored the electronic properties of Sc-based MXenes via first-principles calculations, with the aim to extend their applicability.
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Affiliation(s)
- Jing-He Liu
- Key Laboratory of Advanced Technology of Materials (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu
- China
| | - Xiang Kan
- Key Laboratory of Advanced Technology of Materials (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu
- China
| | - Bin Amin
- Department of Physics
- Hazara University
- Pakistan
| | - Li-Yong Gan
- Key Laboratory of Advanced Technology of Materials (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu
- China
| | - Yong Zhao
- Key Laboratory of Advanced Technology of Materials (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu
- China
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32
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Kong Q, Feng W, Wang Q, Gan LY, Sun C. SiS nanosheets as a promising anode material for Li-ion batteries: a computational study. Phys Chem Chem Phys 2017; 19:8563-8567. [DOI: 10.1039/c7cp00379j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two-dimensional Pma2-SiS monolayer has been predicted to show promising Li-storage properties.
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Affiliation(s)
- Qingquan Kong
- School of Mechanical Engineering
- Chengdu University
- Chengdu
- China
| | - Wei Feng
- School of Mechanical Engineering
- Chengdu University
- Chengdu
- China
| | - Qingyuan Wang
- School of Mechanical Engineering
- Chengdu University
- Chengdu
- China
| | - Li-Yong Gan
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu
- China
| | - Chenghua Sun
- School of Mechanical Engineering
- Chengdu University
- Chengdu
- China
- Department of Chemistry and Biotechnology
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33
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Khan SA, Amin B, Gan LY, Ahmad I. Strain engineering of electronic structures and photocatalytic responses of MXenes functionalized by oxygen. Phys Chem Chem Phys 2017; 19:14738-14744. [DOI: 10.1039/c7cp02513k] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unstrained and biaxial tensile strained Ti2CO2, Zr2CO2, and Hf2CO2can be used to oxidize H2O into O2, while compressed Ti2CO2fails to oxidize H2O to O2.
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Affiliation(s)
- S. A. Khan
- Department of Physics
- Hazara University
- Pakistan
| | - B. Amin
- Department of Physics
- Hazara University
- Pakistan
| | - Li-Yong Gan
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu
- China
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Xin X, Gan LY, Van Hove MA, Ren X, Wang H, Guo CS, Zhao Y. Exploring Molecules beyond CO as Tip Functionalizations in High-Resolution Noncontact Atomic Force Microscopy: A First Principles Approach. ACS Omega 2016; 1:1004-1009. [PMID: 31457178 PMCID: PMC6640759 DOI: 10.1021/acsomega.6b00168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 11/09/2016] [Indexed: 06/10/2023]
Abstract
Atomic resolution of molecules has been achieved using noncontact atomic force microscopy (AFM) with the key step to functionalize the tip apex by attaching suitable molecules so as to achieve high spatial resolution through a sharper tip. A few molecular terminations have been explored theoretically and experimentally, and they exhibit various imaging behaviors. Here, we explore the influence of the structures and chemical compositions of various molecular candidates as tips on the contrast of AFM images by a first principles approach. Our results reveal that the two end atoms of a linear molecule terminating nearest the sample dominate the imaging behaviors, for example, atomic resolution, sharpness, distortion, and so forth, whereas the symmetry of the termination plays an important role in the distortion of AFM images. These findings suggest that new tip terminations can be engineered by decoupling the three end atoms responsible for imaging behaviors from the tip structure behind them, which is attached to the macro tip apex.
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Affiliation(s)
- Xiaojun Xin
- Key
Laboratory of Advanced Technology of Materials (Ministry of Education),
Superconductivity and New Energy R&D Center and School of Physical Science and
Technology, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
| | - Li-Yong Gan
- Key
Laboratory of Advanced Technology of Materials (Ministry of Education),
Superconductivity and New Energy R&D Center and School of Physical Science and
Technology, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
| | - Michel A. Van Hove
- Institute
of Computational and Theoretical Studies and Department of Physics, Hong Kong Baptist University, Kowloon, Hong Kong Special Administrative
Region
| | - Xinguo Ren
- Key Laboratory of Quantum Information and Synergistic Innovation Center of
Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Hongyan Wang
- Key
Laboratory of Advanced Technology of Materials (Ministry of Education),
Superconductivity and New Energy R&D Center and School of Physical Science and
Technology, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
| | - Chun-Sheng Guo
- Key
Laboratory of Advanced Technology of Materials (Ministry of Education),
Superconductivity and New Energy R&D Center and School of Physical Science and
Technology, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
| | - Yong Zhao
- Key
Laboratory of Advanced Technology of Materials (Ministry of Education),
Superconductivity and New Energy R&D Center and School of Physical Science and
Technology, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
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Guo C, Zhou Y, Shi XQ, Gan LY, Jiang H, Zhao Y. Robust half-metallic ferromagnetism and curvature dependent magnetic coupling in fluorinated boron nitride nanotubes. Phys Chem Chem Phys 2016; 18:12307-11. [PMID: 27086676 DOI: 10.1039/c6cp01477a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The fluorinated boron nitride (F-BN) nanostructures are found to be fully spin polarized and half-metallic by means of first-principles calculations based on the Heyd-Scuseria-Ernzerhof hybrid functional. It is found that the full spin polarization and 1 μB local moment in F-BN nanotubes are independent of tube radius and it is also robust in planar ribbons and sheets. The long-ranged ferromagnetic coupling between local moments decreases with decreasing tube radius. This suggests that F-BN systems with small local curvatures could be more easily experimentally observed and have greater potential applications in spin devices.
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Affiliation(s)
- Chunsheng Guo
- Key Laboratory of Advanced Technology of Materials (Ministry of Education), Superconductivity and New Energy R&D Center, Southwest Jiaotong University, Mail Stop 165#, Chengdu, Sichuan 610031, China.
| | - Yu Zhou
- Key Laboratory of Advanced Technology of Materials (Ministry of Education), Superconductivity and New Energy R&D Center, Southwest Jiaotong University, Mail Stop 165#, Chengdu, Sichuan 610031, China.
| | - Xin-Qiang Shi
- Department of Physics, South University of Science and Technology of China, Shenzhen 518055, China
| | - Li-Yong Gan
- Key Laboratory of Advanced Technology of Materials (Ministry of Education), Superconductivity and New Energy R&D Center, Southwest Jiaotong University, Mail Stop 165#, Chengdu, Sichuan 610031, China.
| | - Hong Jiang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Application, College of Chemistry and Molecular Engineering, Peking University, 100871 Beijing, China.
| | - Yong Zhao
- Key Laboratory of Advanced Technology of Materials (Ministry of Education), Superconductivity and New Energy R&D Center, Southwest Jiaotong University, Mail Stop 165#, Chengdu, Sichuan 610031, China. and School of Materials Science and Engineering, University of New South Wales, Sydney, 2052 NSW, Australia
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Yang F, Xi J, Gan LY, Wang Y, Lu S, Ma W, Cai F, Zhang Y, Cheng C, Zhao Y. Improved charge transfer and photoelectrochemical performance of CuI/Sb 2 S 3 /TiO 2 heterostructure nanotube arrays. J Colloid Interface Sci 2016; 464:1-9. [DOI: 10.1016/j.jcis.2015.11.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 11/02/2015] [Accepted: 11/04/2015] [Indexed: 10/22/2022]
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Gan LY, Zhang LH, Zhang Q, Guo CS, Schwingenschlögl U, Zhao Y. Strain tuning of the charge density wave in monolayer and bilayer 1T-TaS2. Phys Chem Chem Phys 2016; 18:3080-5. [DOI: 10.1039/c5cp05695k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Analysis of monolayer and bilayer 1T-TaS2 suggests that the insulating state of the bulk is a consequence of interlayer decoupling.
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Affiliation(s)
- Li-Yong Gan
- Key Laboratory of Advanced Technology of Materials (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu
- China
| | - Li-Hong Zhang
- Key Laboratory of Advanced Technology of Materials (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu
- China
| | - Qingyun Zhang
- PSE Division
- KAUST
- Thuwal 23955-6900
- Kingdom of Saudi Arabia
| | - Chun-Sheng Guo
- Key Laboratory of Advanced Technology of Materials (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu
- China
| | | | - Yong Zhao
- Key Laboratory of Advanced Technology of Materials (Ministry of Education)
- Superconductivity and New Energy R&D Center
- Southwest Jiaotong University
- Chengdu
- China
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Nie A, Gan LY, Cheng Y, Li Q, Yuan Y, Mashayek F, Wang H, Klie R, Schwingenschlogl U, Shahbazian-Yassar R. Twin boundary-assisted lithium ion transport. Nano Lett 2015; 15:610-5. [PMID: 25517795 DOI: 10.1021/nl504087z] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
With the increased need for high-rate Li-ion batteries, it has become apparent that new electrode materials with enhanced Li-ion transport should be designed. Interfaces, such as twin boundaries (TBs), offer new opportunities to navigate the ionic transport within nanoscale materials. Here, we demonstrate the effects of TBs on the Li-ion transport properties in single crystalline SnO2 nanowires. It is shown that the TB-assisted lithiation pathways are remarkably different from the previously reported lithiation behavior in SnO2 nanowires without TBs. Our in situ transmission electron microscopy study combined with direct atomic-scale imaging of the initial lithiation stage of the TB-SnO2 nanowires prove that the lithium ions prefer to intercalate in the vicinity of the (101̅) TB, which acts as conduit for lithium-ion diffusion inside the nanowires. The density functional theory modeling shows that it is energetically preferred for lithium ions to accumulate near the TB compared to perfect neighboring lattice area. These findings may lead to the design of new electrode materials that incorporate TBs as efficient lithium pathways, and eventually, the development of next generation rechargeable batteries that surpass the rate performance of the current commercial Li-ion batteries.
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Affiliation(s)
- Anmin Nie
- Department of Mechanical Engineering-Engineering Mechanics, Michigan Technological University , 1400 Townsend Dive, Houghton, Michigan 49931, United States
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Cheng Y, Nie A, Zhang Q, Gan LY, Shahbazian-Yassar R, Schwingenschlogl U. Origin of the phase transition in lithiated molybdenum disulfide. ACS Nano 2014; 8:11447-11453. [PMID: 25375988 DOI: 10.1021/nn505668c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Phase transitions and phase engineering in two-dimensional MoS2 are important for applications in electronics and energy storage. By in situ transmission electron microscopy, we find that H-MoS2 transforms to T-LiMoS2 at the early stages of lithiation followed by the formation of Mo and Li2S phases. The transition from H-MoS2 to T-LiMoS2 is explained in terms of electron doping and electron-phonon coupling at the conduction band minima. Both are essential for the development of two-dimensional semiconductor-metal contacts based on MoS2 and the usage of MoS2 as anode material in Li ion batteries.
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Affiliation(s)
- Yingchun Cheng
- Department of Materials Science and Engineering, King Abdullah University of Science & Technology , Thuwal, 23955-6900, Kingdom of Saudi Arabia
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Abstract
First-principles calculations are performed to explore the geometry, bonding, and electronic structures of six ultrathin photovoltaic heterostructures consisting of pristine and B- or N-doped fullerenes and MoS2 or WS2 monolayers. The fullerenes prefer to be attached with a hexagon parallel to the monolayer, where B and N favor proximity to the monolayer. The main electronic properties of the subsystems stay intact, suggesting weak interfacial interaction. Both the C60/MoS2 and C60/WS2 systems show type-II band alignments. However, the built-in potential in the former case is too small to effectively drive electron-hole separation across the interface, whereas the latter system is predicted to show good photovoltaic performance. Unfortunately, B and N doping destroys the type-II band alignment on MoS2 and preserves it only in one spin channel on WS2, which is unsuitable for excitonic solar cells. Our results suggest that the C60/WS2 system is highly promising for excitonic solar cells.
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Affiliation(s)
- Li-Yong Gan
- PSE Division, KAUST, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Qingyun Zhang
- PSE Division, KAUST, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Yingchun Cheng
- PSE Division, KAUST, Thuwal 23955-6900, Kingdom of Saudi Arabia
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Nie A, Gan LY, Cheng Y, Asayesh-Ardakani H, Li Q, Dong C, Tao R, Mashayek F, Wang HT, Schwingenschlögl U, Klie RF, Yassar RS. Atomic-scale observation of lithiation reaction front in nanoscale SnO2 materials. ACS Nano 2013; 7:6203-6211. [PMID: 23730945 DOI: 10.1021/nn402125e] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In the present work, taking advantage of aberration-corrected scanning transmission electron microscopy, we show that the dynamic lithiation process of anode materials can be revealed in an unprecedented resolution. Atomically resolved imaging of the lithiation process in SnO2 nanowires illustrated that the movement, reaction, and generation of b = [1[overline]1[overline]1] mixed dislocations leading the lithiated stripes effectively facilitated lithium-ion insertion into the crystalline interior. The geometric phase analysis and density functional theory simulations indicated that lithium ions initial preference to diffuse along the [001] direction in the {200} planes of SnO2 nanowires introduced the lattice expansion and such dislocation behaviors. At the later stages of lithiation, the Li-induced amorphization of rutile SnO2 and the formation of crystalline Sn and LixSn particles in the Li2O matrix were observed.
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Affiliation(s)
- Anmin Nie
- Department of Mechanical Engineering-Engineering Mechanics, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA
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Gan LY, Tian RY, Yang XB, Zhao YJ. Surface structure and phase transition of K adsorption on Au(111): by ab initio atomistic thermodynamics. J Chem Phys 2012; 136:044510. [PMID: 22299894 DOI: 10.1063/1.3678842] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We studied the interactions between atomic potassium (K) and Au(111) at a range of coverage (i.e., Θ(K) = 0.11-0.5 monolayer (ML)) by ab initio atomic thermodynamics. For K on-surface adsorption, we found that K energetically favors the three-fold hollow sites (fcc or hcp), while the most significant surface rumpling was obtained at the atop sites. The incorporation of gold atoms in the adsorbate layer gradually becomes energetically favorable with increasing K coverage. We proposed a possible model with a stoichiometry of K(2)Au for the (2 × 2)-0.5 ML phase observed in lower energy electron diffraction (LEED): one K at atop site and the other K as well as one Au adatom at the second-nearest fcc/hcp and hcp/fcc, respectively. Clear theoretical evidences were given for the ionic interaction of K on Au surface. Additionally, phase transitions were predicted based on chemical potential equilibrium of K, largely in line with the earlier reported LEED observations: the clean surface → (√3 × √3)R30° → (2 × 2), and (2 × 2) → (√3 × √3)R30° reversely at an elevated temperature.
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Affiliation(s)
- Li-Yong Gan
- Department of Physics, South China University of Technology, Guangzhou 510640, People's Republic of China
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Gan LY, Zhao YJ. Erratum: “Charge effect in S enhanced CO adsorption: A theoretical study of CO on Au, Ag, Cu, and Pd (111) surfaces coadsorbed with S, O, Cl, and Na” [J. Chem. Phys. 133, 094703 (2010)]. J Chem Phys 2011. [DOI: 10.1063/1.3553260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Gan LY, Tian RY, Yang XB, Peng SL, Zhao YJ. Interaction between NO and Na, O, S, Cl on Au and Pd(111) surfaces. Phys Chem Chem Phys 2011; 13:14466-75. [DOI: 10.1039/c1cp20974d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gan LY, Zhao YJ. Charge effect in S enhanced CO adsorption: A theoretical study of CO on Au, Ag, Cu, and Pd (111) surfaces coadsorbed with S, O, Cl, and Na. J Chem Phys 2010; 133:094703. [DOI: 10.1063/1.3483235] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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