1
|
Wang S, Wang M, Shao J, Liang X, Pan G, Qi Y. Dual-Functional Tungsten-Doped NiO for Highly Sensitive Triethylamine Sensor with ppb Level Detection Limit. ACS APPLIED MATERIALS & INTERFACES 2024; 16:51354-51363. [PMID: 39264240 DOI: 10.1021/acsami.4c12495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/13/2024]
Abstract
In this study, the W-doped Nickel oxide (NiO) nanoflowers were synthesized using a straightforward hydrothermal method, significantly enhancing the sensing performance toward triethylamine through dual-functional tungsten doping. The optimal doping concentration not only increased the specific surface area of NiO from 25.54 to 189.19 m2 g-1 but also reduced the formation energy of oxygen vacancies. The sensor containing 4 at % W-doped NiO demonstrated exceptional sensitivity to triethylamine, achieving a detection level as high as 229.0 for concentrations of 100 ppm at 237.5 °C. This triethylamine sensor represents a 135-fold enhancement over sensors fabricated from undoped NiO, and offers a rapid response/recovery time of 8 and 30 s, respectively. Furthermore, at a lower triethylamine concentration of 50 ppb, indicating a lower detection limit.
Collapse
Affiliation(s)
- Shangyan Wang
- School of Electronics and Information Engineering, Tianjin Key Laboratory of Electronic Materials and Devices, Hebei University of Technology, 5340 Xiping Road, Beichen District, Tianjin 300401, China
- Hebei Collaborative Innovation Center of Microelectronic Materials and Technology on Ultra Precision Processing, Hebei Engineering Research Center of Microelectronic Materials and Devices (ERC), Tianjin 300130, China
- Innovation and Research Institute of Hebei University of Technology in Shijiazhuang, Shijiazhuang 050299, China
| | - Mengjie Wang
- School of Electronics and Information Engineering, Tianjin Key Laboratory of Electronic Materials and Devices, Hebei University of Technology, 5340 Xiping Road, Beichen District, Tianjin 300401, China
- Hebei Collaborative Innovation Center of Microelectronic Materials and Technology on Ultra Precision Processing, Hebei Engineering Research Center of Microelectronic Materials and Devices (ERC), Tianjin 300130, China
- Innovation and Research Institute of Hebei University of Technology in Shijiazhuang, Shijiazhuang 050299, China
| | - Junkai Shao
- School of Electronics and Information Engineering, Tianjin Key Laboratory of Electronic Materials and Devices, Hebei University of Technology, 5340 Xiping Road, Beichen District, Tianjin 300401, China
- Hebei Collaborative Innovation Center of Microelectronic Materials and Technology on Ultra Precision Processing, Hebei Engineering Research Center of Microelectronic Materials and Devices (ERC), Tianjin 300130, China
- Innovation and Research Institute of Hebei University of Technology in Shijiazhuang, Shijiazhuang 050299, China
| | - Xichen Liang
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, United States
| | - Guofeng Pan
- School of Electronics and Information Engineering, Tianjin Key Laboratory of Electronic Materials and Devices, Hebei University of Technology, 5340 Xiping Road, Beichen District, Tianjin 300401, China
- Hebei Collaborative Innovation Center of Microelectronic Materials and Technology on Ultra Precision Processing, Hebei Engineering Research Center of Microelectronic Materials and Devices (ERC), Tianjin 300130, China
- Innovation and Research Institute of Hebei University of Technology in Shijiazhuang, Shijiazhuang 050299, China
| | - Yuhang Qi
- School of Electronics and Information Engineering, Tianjin Key Laboratory of Electronic Materials and Devices, Hebei University of Technology, 5340 Xiping Road, Beichen District, Tianjin 300401, China
- Hebei Collaborative Innovation Center of Microelectronic Materials and Technology on Ultra Precision Processing, Hebei Engineering Research Center of Microelectronic Materials and Devices (ERC), Tianjin 300130, China
- Innovation and Research Institute of Hebei University of Technology in Shijiazhuang, Shijiazhuang 050299, China
| |
Collapse
|
2
|
Long Y, Wang X, Zhang H, Wang K, Ong WL, Bogaerts A, Li K, Lu C, Li X, Yan J, Tu X, Zhang H. Plasma Chemical Looping: Unlocking High-Efficiency CO 2 Conversion to Clean CO at Mild Temperatures. JACS AU 2024; 4:2462-2473. [PMID: 39055137 PMCID: PMC11267539 DOI: 10.1021/jacsau.4c00153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 04/15/2024] [Accepted: 04/25/2024] [Indexed: 07/27/2024]
Abstract
We propose a plasma chemical looping CO2 splitting (PCLCS) approach that enables highly efficient CO2 conversion into O2-free CO at mild temperatures. PCLCS achieves an impressive 84% CO2 conversion and a 1.3 mmol g-1 CO yield, with no O2 detected. Crucially, this strategy significantly lowers the temperature required for conventional chemical looping processes from 650 to 1000 °C to only 320 °C, demonstrating a robust synergy between plasma and the Ce0.7Zr0.3O2 oxygen carrier (OC). Systematic experiments and density functional theory (DFT) calculations unveil the pivotal role of plasma in activating and partially decomposing CO2, yielding a mixture of CO, O2/O, and electronically/vibrationally excited CO2*. Notably, these excited CO2* species then efficiently decompose over the oxygen vacancies of the OCs, with a substantially reduced activation barrier (0.86 eV) compared to ground-state CO2 (1.63 eV), contributing to the synergy. This work offers a promising and energy-efficient pathway for producing O2-free CO from inert CO2 through the tailored interplay of plasma and OCs.
Collapse
Affiliation(s)
- Yanhui Long
- State
Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
- College
of Energy Engineering, ZJU-UIUC, Zhejiang
University, Hangzhou 310027, China
| | - Xingzi Wang
- School
of Mechanical Engineering, Shanghai Jiao
Tong University, Shanghai 200240, China
| | - Hai Zhang
- School
of Mechanical Engineering, Shanghai Jiao
Tong University, Shanghai 200240, China
| | - Kaiyi Wang
- State
Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Wee-Liat Ong
- College
of Energy Engineering, ZJU-UIUC, Zhejiang
University, Hangzhou 310027, China
| | - Annemie Bogaerts
- Research
Group PLASMANT, Department of Chemistry, University of Antwerp, Universiteitsplein 1, Antwerp 2610, Belgium
| | - Kongzhai Li
- State
Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China
| | - Chunqiang Lu
- Department
of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, U.K.
| | - Xiaodong Li
- State
Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Jianhua Yan
- State
Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
- Ningbo
Innovation Center, Zhejiang University, Ningbo 315100, China
| | - Xin Tu
- Department
of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, U.K.
| | - Hao Zhang
- State
Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
- Ningbo
Innovation Center, Zhejiang University, Ningbo 315100, China
| |
Collapse
|
3
|
Wang Y, Chen J, Liu K, Wang M, Song D, Wang K. Computational Screening of La 2NiO 4+δ Cathodes with Ni Site Doping for Solid Oxide Fuel Cells. Inorg Chem 2023; 62:7574-7583. [PMID: 37133438 DOI: 10.1021/acs.inorgchem.3c01044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Doping on the crystal structure is a common strategy to modify electronic conductivity, ion conductivity, and thermal stability. In this work, a series of transition metal elements (Fe, Co, Cu, Ru, Rh, Pd, Os, Ir, and Pt) doped at the Ni site of La2NiO4+δ compounds as cathode materials of solid oxide fuel cells (SOFCs) are explored based on first-principles calculations, through which the determinant factors for interstitial oxygen formations and migrations are discussed at an atomistic level. The interstitial oxygen formation and migration energies for doped La2NiO4 are largely reduced in contrast to the pristine La2NiO4+δ, which is explained by charge density distributions, charge density gradients, and Bader charge differences. In addition, based on a negative correlation between formation energy and migration barrier, the promising cathode materials for SOFCs were screened out between the doped systems. The Fe-doped structures of x = 0.25, Ru-doped structures of x = 0.25 and x = 0.375, Rh-doped structures of x = 0.50, and Pd-doped structures of x = 0.375 and x = 0.50 are screened out with interstitial oxygen formation energy less than -3 eV and migration barrier less than 1.1 eV. In addition, DOS analysis indicates that doping to La2NiO4+δ also facilitates the electron conductions. Our work provides a theoretical guideline for the optimization and design of La2NiO4+δ-based cathode materials by doping.
Collapse
Affiliation(s)
- Yongqing Wang
- School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
- Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou, Henan 450002, China
| | - Jiangshuai Chen
- School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
- Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou, Henan 450002, China
| | - Keli Liu
- School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
- Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou, Henan 450002, China
| | - Mingyuan Wang
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
- Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou, Henan 450002, China
| | - Dongxing Song
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
- Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou, Henan 450002, China
| | - Ke Wang
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
- Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou, Henan 450002, China
| |
Collapse
|
4
|
Sun J, Kang S, Kim J, Min K. Accelerated Discovery of Novel Garnet-Type Solid-State Electrolyte Candidates via Machine Learning. ACS APPLIED MATERIALS & INTERFACES 2023; 15:5049-5057. [PMID: 36654192 DOI: 10.1021/acsami.2c15980] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
All-solid-state batteries (ASSBs) have attracted considerable attention because of their higher energy density and stability than conventional lithium-ion batteries (LIBs). For the development of promising ASSBs, solid-state electrolytes (SSEs) are essential to achieve structural integrity. Thus, in this study, a machine-learning-based surrogate model was developed to search for ideal garnet-type SSE candidates. The well-known Li7La3Zr2O12 structure was used as a base material, and 73 chemical elements were substituted on La and Zr sites, leading to 5329 potential structures. First, the elasticity database and machine learning descriptors were adopted from previous studies. Subsequently, the machine-learning-based surrogate model was applied to predict the elastic properties of potential SSE materials, followed by first-principles calculations for validation. Furthermore, the active learning process demonstrated that it can effectively decrease prediction uncertainty. Finally, the ionic conductivity of the mechanically superior materials was predicted to suggest optimal SSE candidates. Then, ab initio molecular dynamics simulations are followed for confirmation of diffusion behavior for materials classified as superionic; 10 new tetragonal-phase garnet SSEs are verified with superior mechanical and ionic conductivity properties. We believe that the current model and the constructed database will become a cornerstone for the development of next-generation SSE materials.
Collapse
Affiliation(s)
- Jiwon Sun
- School of Mechanical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea
| | - Seungpyo Kang
- School of Mechanical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea
| | - Joonchul Kim
- School of Mechanical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea
| | - Kyoungmin Min
- School of Mechanical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea
| |
Collapse
|
5
|
Das D, Prakash J, Goutam UK, Manna S, Gupta SK, Sudarshan K. Oxygen vacancy and valence engineering in CeO 2 through distinct sized ion doping and their impact on oxygen reduction reaction catalysis. Dalton Trans 2022; 51:18572-18582. [PMID: 36444845 DOI: 10.1039/d2dt03198a] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Defect tuning in ceria to enhance its catalytic properties is a subject of great interest for the scientific community owing to the growing demand for catalytic materials in drug, automobile and chemical industries. Doping induced defect engineering was found to be one of the most sought out strategies particularly in oxides for achieving multifunctionality. Here, in this study, we have doped ceria with distinct sized trivalent rare-earth ions, namely, Y3+, Eu3+ and La3+, using combustion techniques. Positron annihilation lifetime spectroscopy (PALS) suggested enhanced defect density with doping in general and higher concentration of oxygen vacancies in La3+ doped ceria compared to Y3+ and Eu3+ counterparts. X-ray photoelectron spectroscopy (XPS) suggested the existence of both Ce3+ and Ce4+, with the former having higher fraction in CeO2:La3+ compared to CeO2:Y3+. The electron transfer resistance (Rct) reduced in all the doped samples when compared to undoped ceria and they demonstrated improved catalytic activity towards the oxygen reduction reaction (ORR). The highest reduction in Rct was seen in the 5% La doped sample owing to the very high concentration of oxygen vacancies and Ce3+/Ce4+ ratio and CeO2:5.0% La3+ showed the best performance towards ORR electrocatalysis. The studies are expected to help in further tuning the catalysts in terms of dopant concentrations, and in future work, the strategy will be to control the Ce3+/Ce4+ ratio and see its implication in both catalytic and magnetic applications.
Collapse
Affiliation(s)
- Debarati Das
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India. .,Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India
| | - Jyoti Prakash
- Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India.,Materials Group, Bhabha Atomic Research Centre, Mumbai-400085, India
| | - U K Goutam
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai-400085, India
| | - S Manna
- Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India.,Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India
| | - Santosh K Gupta
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India. .,Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India
| | - K Sudarshan
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India. .,Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India
| |
Collapse
|
6
|
Hu W, Yie KHR, Liu C, Zhu J, Huang Z, Zhu B, Zheng D, Yang B, Huang B, Yao L, Liu J, Shen X, Deng Z. Improving the valence self-reversible conversion of cerium nanoparticles on titanium implants by lanthanum doping to enhance ROS elimination and osteogenesis. Dent Mater 2022; 38:1362-1375. [PMID: 35752471 DOI: 10.1016/j.dental.2022.06.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 05/04/2022] [Accepted: 06/05/2022] [Indexed: 11/29/2022]
Abstract
Equipped with anti-oxidative properties, cerium oxide nanoparticles (CNPs) are gradually being adopted over the years in the field of oxidative stress research. However, the effects of CNPs may be diminished when under the influence of prolonged and substantially elevated levels of oxidative stress. Therefore, it is imperative to enhance the efficacy of CNPs to resist oxidative stress. In this study, our approach involves the fabrication of titanium surface CNPs coatings doped with different concentrations of lanthanum ions (La3+) and the investigation of their local anti-oxidative stress potential. The physicochemical characterization showed that the La-CNPs groups had a substantial increase in the generation of oxygen vacancies within the CNPs structure with the increase of La doping concentration. In vitro findings proofed that the cytocompatibility of different La-CNPs coatings showed a trend of increasing first and then decreasing with the increase of La doping concentration under oxidative stress microenvironment. Among these groups, the 30 % La-CNPs group presented the best cell proliferation and osteogenic differentiation which could activate the FoxO1 pathway, then upregulated the expression of SOD1 and CAT, and finally resulted in the inhibition of ROS production. In vivo results further confirmed that the 30 % La-CNPs group showed significant osteogenic effects in two rat models (osteoporosis and diabetes models). In conclusion, we believe that the 30 % La-CNPs coating holds promising potential for its implant applications in patients with oxidative stress-related diseases.
Collapse
Affiliation(s)
- Wenjia Hu
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China
| | - Kendrick Hii Ru Yie
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China
| | - Chongxing Liu
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China
| | - Jinlei Zhu
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China
| | - Zhuo Huang
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China
| | - Bingbing Zhu
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China
| | - Dongyang Zheng
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China
| | - Bingqian Yang
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China
| | - Benheng Huang
- School and Hospital of Stomatology, Lanzhou University, Lanzhou 730000, China
| | - Lili Yao
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China
| | - Jinsong Liu
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China.
| | - Xinkun Shen
- Science and Education Division, The Third Affiliated Hospital of Wenzhou Medical University (Ruian People's Hospital), Wenzhou 325016, China.
| | - Zhennan Deng
- School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325000, China.
| |
Collapse
|
7
|
Rare Earth (Gd, Pr and La) Promoted Three-Dimensional Ordered Macro/Mesoporous Ni/CeZr Catalysts for Low-Temperature Catalytic Steam Reforming of Toluene as Tar Model. Catal Letters 2022. [DOI: 10.1007/s10562-022-03952-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
8
|
Das D, Gupta SK, Mohapatra M, Sudarshan K. Defect engineering in trivalent ion doped ceria through vanadium assisted charge compensation: insight using photoluminescence, positron annihilation and electron spin resonance spectroscopy. Dalton Trans 2021; 50:17378-17389. [PMID: 34792043 DOI: 10.1039/d1dt03111b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pair matching charge compensation with trivalent and pentavalent dopants in ceria was found to be an attractive strategy in engineering defects with minimal distortions in the lattice and obtaining enhanced catalytic properties. In the present study, charge compensation with a vanadium codopant in trivalent ion doped ceria is studied. Defect evolution in the trivalent ion doped ceria with vanadium codoping has been studied in CeO2:Eu3+, CeO2:La3+,Eu3+ and CeO2:Y3+,Eu3+ systems and the choices of the dopant and co-dopant are triggered by their ionic radius. Eu3+ photoluminescence (PL) is used as a spectroscopic probe to monitor local structural changes around the dopants. Positron lifetime studies showed that oxygen vacancies formed due to trivalent ion doping are weakly associated when larger ions are doped and result in the formation of vacancy aggregates. Positron lifetime studies along with XRD studies show that vanadium codoping effectively removes the vacancies but the distortions are significant when the size mismatch between the pair match used for charge compensation is higher. Photoluminescence demonstrated that the oxygen vacancies associated with Eu are more effectively removed in the case of Y codoped samples. Electron Spin Resonance (ESR) studies suggested that vanadium in excess over the stoichiometric concentration of the trivalent ion can lead to additional defects. These studies are expected to help in tuning the vacancy concentrations as well as controlling the lattice distortions for technological applications such as catalysis, ionic conductivity, etc.
Collapse
Affiliation(s)
- Debarati Das
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India.
| | - Santosh K Gupta
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India. .,Homi Bhabha National Institute, Anushaktinagar, Mumbai - 400094, India
| | - M Mohapatra
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India. .,Homi Bhabha National Institute, Anushaktinagar, Mumbai - 400094, India
| | - K Sudarshan
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India. .,Homi Bhabha National Institute, Anushaktinagar, Mumbai - 400094, India
| |
Collapse
|
9
|
Wang Q, Fan H, Xiao Y, Zhang Y. Applications and recent advances of rare earth in solid oxide fuel cells. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2021.09.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
10
|
Zhang L, Ji W, Guo Q, Cheng Y, Liu X, Lu H, Dai H. Probing into the In-Situ Exsolution Mechanism of Metal Nanoparticles from Doped Ceria Host. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2114. [PMID: 34443943 PMCID: PMC8398560 DOI: 10.3390/nano11082114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/16/2021] [Accepted: 08/18/2021] [Indexed: 11/16/2022]
Abstract
Exsolved nanoparticle catalysts have recently attracted broad research interest as they simultaneously combine the features of catalytic activity and chemical stability in various applications of energy conversion and storage. As the internal mechanism of in-situ exsolution is of prime significance for the optimization of its strategy, comprehensive research focused on the behaviors of in-situ segregation for metal (Mn, Fe, Co, Ni, Cu, Ag, Pt and Au)-substituted CeO2 is reported using first-principles calculations. An interesting link between the behaviors of metal growth from the ceria host and their microelectronic reconfigurations was established to understand the inherent attribute of metal self-regeneration, where a stair-stepping charge difference served as the inner driving force existing along the exsolving pathway, and the weak metal-coordinate associations synergistically facilitate the ceria's in-situ growth. We hope that these new insights provide a microscopic insight into the physics of in-situ exsolution to gain a guideline for the design of nanoparticle socketed catalysts from bottom to top.
Collapse
Affiliation(s)
- Lifang Zhang
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| | - Weiwei Ji
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| | - Qiyang Guo
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| | - Yu Cheng
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| | - Xiaojuan Liu
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
- University of Science and Technology of China, Hefei 230026, China
| | - Hongbin Lu
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| | - Hong Dai
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| |
Collapse
|
11
|
Kannan K, Radhika D, Nesaraj AS, Revathi V, Sadasivuni KK. A simple chemical precipitation of ceria based (Sm doped-CGO) nanocomposite: structural and electrolytic behaviour for LT-SOFCs. SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-020-3035-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
|
12
|
Abstract
The crystallographic properties of the Ce1−x(Nd0.63Dy0.37)xO2−x/2 system (0 ≤ x ≤ 0.6) were studied by means of synchrotron powder X-ray diffraction and compared to the ones of Sm-doped ceria. The aim of this work was to investigate the effect of substituting Sm3+ by a mixture of a smaller and a larger ion that ensures a more pronounced Ce4+/dopant size mismatch while having the same average ionic size as Sm3+. Two main findings came to light: (a) the compositional region of the CeO2-based solid solution widens up to x ranging between 0.4 and 0.5, and (b) the cell parameter is larger than the one of Sm-doped ceria at each composition. Both effects are expected to play a significant role on the ionic conductivity of the material. The results are discussed in terms of disorder and cation-vacancy association.
Collapse
|
13
|
Ao B, Tang J, Ye X, Tao R, Qiu R. Phase Segregation, Transition, or New Phase Formation of Plutonium Dioxide: The Roles of Transition Metals. Inorg Chem 2019; 58:4350-4364. [PMID: 30864447 DOI: 10.1021/acs.inorgchem.8b03497] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
As impurities are virtually impossible to exclude from Pu oxides in realistic environments, understanding the roles of impurities is crucial for the applications and designs of Pu oxides. Here we perform a systematic first-principles DFT + U calculation to find the trends of transition-metal (TM) behaviors in PuO2 in terms of energetics, atomic properties, oxidation states, and electronic structures. The results show that group IV-B elements Ti, Zr, and Hf are energetically and electronically favorable in PuO2 and render the possibilities of forming Pu-TM-O ternary phases. In contrast, the remaining TMs tend to destabilize PuO2 and whether phase segregation or transition occurs largely depends on the redox conditions: oxidation one induces segregation, whereas reduction one facilitates the transition from PuO2 to Pu2O3. On the basis of the correlations between the properties of TMs and their relative stabilities in PuO2, we conclude that the degree of electron match between TMs and Pu plays the decisive role in the stability, as established for the cases of tetravalent elements, whereas some electron-mismatched but energetically stable TMs such as III-B and V-B elements could drive the valence transition of Pu, resulting in the phase instability of PuO2.
Collapse
Affiliation(s)
- Bingyun Ao
- Science and Technology on Surface Physics and Chemistry Laboratory , Mianyang 621908 , Sichuan , People's Republic of China
| | - Jun Tang
- Science and Technology on Surface Physics and Chemistry Laboratory , Mianyang 621908 , Sichuan , People's Republic of China
| | - Xiaoqiu Ye
- Science and Technology on Surface Physics and Chemistry Laboratory , Mianyang 621908 , Sichuan , People's Republic of China
| | - Ran Tao
- Science and Technology on Surface Physics and Chemistry Laboratory , Mianyang 621908 , Sichuan , People's Republic of China
| | - Ruizhi Qiu
- Science and Technology on Surface Physics and Chemistry Laboratory , Mianyang 621908 , Sichuan , People's Republic of China
| |
Collapse
|
14
|
Ding Q, Qiu R, Ao B. Dependency of f states in fluorite-type XO2 (X = Ce, Th, U) on the stability and electronic state of doped transition metals. Phys Chem Chem Phys 2019; 21:25962-25975. [DOI: 10.1039/c9cp04371c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transition metals (TMs) exhibit different quantum-mechanical oxidation state (OSqm) population when doped into fluorite-type CeO2, ThO2 and UO2.
Collapse
Affiliation(s)
- Qian Ding
- Science and Technology on Surface Physics and Chemistry Laboratory
- Mianyang 621908
- China
| | - Ruizhi Qiu
- Science and Technology on Surface Physics and Chemistry Laboratory
- Mianyang 621908
- China
| | - Bingyun Ao
- Science and Technology on Surface Physics and Chemistry Laboratory
- Mianyang 621908
- China
| |
Collapse
|