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Xue F, Li Q, Ji W, Lv M, Xu H, Zeng J, Li T, Ren Y, Zhou L, Chen X, Deng J, Lin K, Xing X. Highly efficient semi-hydrogenation in strained ultrathin PdCu shell and the atomic deciphering for the unlocking of activity-selectivity. Chem Sci 2024; 15:11837-11846. [PMID: 39092101 PMCID: PMC11290329 DOI: 10.1039/d4sc03291h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2024] [Accepted: 06/25/2024] [Indexed: 08/04/2024] Open
Abstract
Excellent ethylene selectivity in acetylene semi-hydrogenation is often obtained at the expense of activity. To break the activity-selectivity trade-off, precise control and in-depth understanding of the three-dimensional atomic structure of surfacial active sites are crucial. Here, we designed a novel Au@PdCu core-shell nanocatalyst featuring diluted and stretched Pd sites on the ultrathin shell (1.6 nm), which showed excellent reactivity and selectivity, with 100% acetylene conversion and 92.4% ethylene selectivity at 122 °C, and the corresponding activity was 3.3 times higher than that of the PdCu alloy. The atomic three-dimensional decoding for the activity-selectivity balance was revealed by combining pair distribution function (PDF) and reverse Monte Carlo simulation (RMC). The results demonstrate that a large number of active sites with a low coordination number of Pd-Pd pairs and an average 3.25% tensile strain are distributed on the surface of the nanocatalyst, which perform a pivotal function in the simultaneous improvement of hydrogenation activity and ethylene selectivity. Our work not only develops a novel strategy for unlocking the linear scaling relation in heterogeneous catalysis but also provides a paradigm for atomic 3D understanding of lattice strain in core-shell nanocatalysts.
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Affiliation(s)
- Fan Xue
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing Beijing 100083 China
| | - Qiang Li
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing Beijing 100083 China
| | - Weihua Ji
- College of Materials Science and Engineering, Taiyuan University of Technology Taiyuan 030024 China
| | - Mingxin Lv
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing Beijing 100083 China
| | - Hankun Xu
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing Beijing 100083 China
| | - Jianrong Zeng
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences 201204 Shanghai P. R. China
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences 201800 Shanghai P. R. China
| | - Tianyi Li
- X-Ray Science Division, Argonne National Laboratory Argonne Illinois 60439 USA
| | - Yang Ren
- Department of Physics, City University of Hong Kong Kowloon Hong Kong 999077 China
| | - Lihui Zhou
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, East China University of Science and Technology Shanghai 200237 China
| | - Xin Chen
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing Beijing 100083 China
| | - Jinxia Deng
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing Beijing 100083 China
| | - Kun Lin
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing Beijing 100083 China
| | - Xianran Xing
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing Beijing 100083 China
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Wang S, Ma L, Song D, Yang S. Au Doping PtNi Nanodendrites for Enhanced Electrocatalytic Methanol Oxidation Reaction. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2855. [PMID: 37947700 PMCID: PMC10650142 DOI: 10.3390/nano13212855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 10/19/2023] [Accepted: 10/25/2023] [Indexed: 11/12/2023]
Abstract
To boost the electrocatalytic methanol oxidation reaction (MOR) of Platinum (Pt), making binary PtM (M = transition metals, for example, Fe, Cu, and Ni) with specific morphology is known as a promising method. Although great progress has been made in the synthesis of shaped PtM catalysts toward MOR, enhancing the catalytic performance of the PtM to enable it to be commercialized is still a hotspot. In this work, the Au-doped PtNi dendritic nanoparticles (Au-PtNi DNPs) were obtained by doping a small amount of gold (Au) into initially prepared PtNi DNPs, greatly improving their MOR catalytic activity and durability. The energy-dispersive X-ray spectroscopy mapping (EDXS) indicates that the surface of DNPs is mainly composed of Au dopant and PtNi, while the core is mainly Pt, indicating the formation of Au-doped PtNi/Pt core-shell-like DNP structures. The electrocatalytic performance of the prepared Au-PtNi DNPs with different compositions for the MOR was evaluated using cyclic voltammetry, chronoamperometry, and CO-stripping tests. The experimental findings indicate that the Au-PtNi DNPs showed better MOR performance in comparison with PtNi DNPs and commercial Pt catalysts. Among all the catalysts, 6% Au-PtNi DNPs showed 4.3 times improved mass catalytic activity for the MOR in comparison with commercial Pt catalysts. In addition, all the prepared Au-PtNi DNPs display a remarkable CO tolerance compared to that of PtNi DNPs and commercial Pt catalysts. The dendritic structure of Au-PtNi DNPs can effectively enhance catalytic performance, combined with the electronic effect of Au, Pt, and Ni.
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Affiliation(s)
- Shan Wang
- Key Laboratory for Molecular Genetic Mechanisms and Intervention Research on High Altitude Disease of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, No. 6 East Wenhui Road, Xianyang 712082, China; (L.M.); (D.S.)
| | - Lifeng Ma
- Key Laboratory for Molecular Genetic Mechanisms and Intervention Research on High Altitude Disease of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, No. 6 East Wenhui Road, Xianyang 712082, China; (L.M.); (D.S.)
| | - Dan Song
- Key Laboratory for Molecular Genetic Mechanisms and Intervention Research on High Altitude Disease of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, No. 6 East Wenhui Road, Xianyang 712082, China; (L.M.); (D.S.)
| | - Shengchun Yang
- Ministry of Education Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, Key Laboratory of Shaanxi for Advanced Materials and Mesoscopic Physics, State Key Laboratory for Mechanical Behavior of Materials, School of Physics, Xi’an Jiaotong University, No. 28 West Xianning Road, Xi’an 710049, China
- National Innovation Platform (Center) for Industry-Education Integration of Energy Storage Technology, Xi’an Jiaotong University, No. 28 West Xianning Road, Xi’an 710049, China
- Shaanxi Collaborative Innovation Center for Hydrogen Fuel Cell Performance Improvement, Xi’an Jiaotong University, No. 28 West Xianning Road, Xi’an 710049, China
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Feng C, Lv M, Shao J, Wu H, Zhou W, Qi S, Deng C, Chai X, Yang H, Hu Q, He C. Lattice Strain Engineering of Ni 2 P Enables Efficient Catalytic Hydrazine Oxidation-Assisted Hydrogen Production. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2305598. [PMID: 37433070 DOI: 10.1002/adma.202305598] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Accepted: 07/07/2023] [Indexed: 07/13/2023]
Abstract
Hydrazine-assisted water electrolysis provides new opportunities to enable energy-saving hydrogen production while solving the issue of hydrazine pollution. Here, the synthesis of compressively strained Ni2 P as a bifunctional electrocatalyst for boosting both the anodic hydrazine oxidation reaction (HzOR) and cathodic hydrogen evolution reaction (HER) is reported. Different from a multistep synthetic method that induces lattice strain by creating core-shell structures, a facile strategy is developed to tune the strain of Ni2 P via dual-cation co-doping. The obtained Ni2 P with a compressive strain of -3.62% exhibits significantly enhanced activity for both the HzOR and HER than counterparts with tensile strain and without strain. Consequently, the optimized Ni2 P delivers current densities of 10 and 100 mA cm-2 at small cell voltages of 0.16 and 0.39 V for hydrazine-assisted water electrolysis, respectively. Density functional theory (DFT) calculations reveal that the compressive strain promotes water dissociation and concurrently tunes the adsorption strength of hydrogen intermediates, thereby facilitating the HER process on Ni2 P. As for the HzOR, the compressive strain reduces the energy barrier of the potential-determining step for the dehydrogenation of *N2 H4 to *N2 H3 . Clearly, this work paves a facile pathway to the synthesis of lattice-strained electrocatalysts via the dual-cation co-doping.
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Affiliation(s)
- Chao Feng
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
| | - Miaoyuan Lv
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
| | - Jiaxin Shao
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
| | - Hanyang Wu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
| | - Weiliang Zhou
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
| | - Shuai Qi
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
| | - Chen Deng
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
| | - Xiaoyan Chai
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
| | - Hengpan Yang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
| | - Qi Hu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
| | - Chuanxin He
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, P. R. China
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Yao Q, Yu Z, Li L, Huang X. Strain and Surface Engineering of Multicomponent Metallic Nanomaterials with Unconventional Phases. Chem Rev 2023; 123:9676-9717. [PMID: 37428987 DOI: 10.1021/acs.chemrev.3c00252] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/12/2023]
Abstract
Multicomponent metallic nanomaterials with unconventional phases show great prospects in electrochemical energy storage and conversion, owing to unique crystal structures and abundant structural effects. In this review, we emphasize the progress in the strain and surface engineering of these novel nanomaterials. We start with a brief introduction of the structural configurations of these materials, based on the interaction types between the components. Next, the fundamentals of strain, strain effect in relevant metallic nanomaterials with unconventional phases, and their formation mechanisms are discussed. Then the progress in surface engineering of these multicomponent metallic nanomaterials is demonstrated from the aspects of morphology control, crystallinity control, surface modification, and surface reconstruction. Moreover, the applications of the strain- and surface-engineered unconventional nanomaterials mainly in electrocatalysis are also introduced, where in addition to the catalytic performance, the structure-performance correlations are highlighted. Finally, the challenges and opportunities in this promising field are prospected.
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Affiliation(s)
- Qing Yao
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Zhiyong Yu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Leigang Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
- College of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, China
| | - Xiaoqing Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
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Lu Q, Zhao Y, Huang L, An J, Zheng Y, Yap EH. Low-Dimensional-Materials-Based Flexible Artificial Synapse: Materials, Devices, and Systems. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:373. [PMID: 36770333 PMCID: PMC9921566 DOI: 10.3390/nano13030373] [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: 12/12/2022] [Revised: 01/10/2023] [Accepted: 01/15/2023] [Indexed: 06/18/2023]
Abstract
With the rapid development of artificial intelligence and the Internet of Things, there is an explosion of available data for processing and analysis in any domain. However, signal processing efficiency is limited by the Von Neumann structure for the conventional computing system. Therefore, the design and construction of artificial synapse, which is the basic unit for the hardware-based neural network, by mimicking the structure and working mechanisms of biological synapses, have attracted a great amount of attention to overcome this limitation. In addition, a revolution in healthcare monitoring, neuro-prosthetics, and human-machine interfaces can be further realized with a flexible device integrating sensing, memory, and processing functions by emulating the bionic sensory and perceptual functions of neural systems. Until now, flexible artificial synapses and related neuromorphic systems, which are capable of responding to external environmental stimuli and processing signals efficiently, have been extensively studied from material-selection, structure-design, and system-integration perspectives. Moreover, low-dimensional materials, which show distinct electrical properties and excellent mechanical properties, have been extensively employed in the fabrication of flexible electronics. In this review, recent progress in flexible artificial synapses and neuromorphic systems based on low-dimensional materials is discussed. The potential and the challenges of the devices and systems in the application of neuromorphic computing and sensory systems are also explored.
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Affiliation(s)
- Qifeng Lu
- School of CHIPS, XJTLU Entrepreneur College (Taicang), Xi’an Jiaotong-Liverpool University, 111 Taicang Avenue, Taicang, Suzhou 215488, China
| | - Yinchao Zhao
- School of CHIPS, XJTLU Entrepreneur College (Taicang), Xi’an Jiaotong-Liverpool University, 111 Taicang Avenue, Taicang, Suzhou 215488, China
| | - Long Huang
- School of Intelligent Manufacturing Ecosystem, XJTLU Entrepreneur College (Taicang), Xi’an Jiaotong-Liverpool University, 111 Taicang Avenue, Taicang, Suzhou 215488, China
| | - Jiabao An
- School of Intelligent Manufacturing Ecosystem, XJTLU Entrepreneur College (Taicang), Xi’an Jiaotong-Liverpool University, 111 Taicang Avenue, Taicang, Suzhou 215488, China
| | - Yufan Zheng
- School of Intelligent Manufacturing Ecosystem, XJTLU Entrepreneur College (Taicang), Xi’an Jiaotong-Liverpool University, 111 Taicang Avenue, Taicang, Suzhou 215488, China
| | - Eng Hwa Yap
- School of Robotics, XJTLU Entrepreneur College (Taicang), Xi’an Jiaotong-Liverpool University, 111 Taicang Avenue, Taicang, Suzhou 215488, China
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6
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Park J, Kim HK, Park J, Kim B, Baik H, Baik MH, Lee K. Flattening bent Janus nanodiscs expands lattice parameters. Chem 2023. [DOI: 10.1016/j.chempr.2022.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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7
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Wu G, Han X, Cai J, Yin P, Cui P, Zheng X, Li H, Chen C, Wang G, Hong X. In-plane strain engineering in ultrathin noble metal nanosheets boosts the intrinsic electrocatalytic hydrogen evolution activity. Nat Commun 2022; 13:4200. [PMID: 35858967 PMCID: PMC9300738 DOI: 10.1038/s41467-022-31971-4] [Citation(s) in RCA: 50] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 07/11/2022] [Indexed: 11/23/2022] Open
Abstract
Strain has been shown to modulate the electronic structure of noble metal nanomaterials and alter their catalytic performances. Since strain is spatially dependent, it is challenging to expose the active strained interfaces by structural engineering with atomic precision. Herein, we report a facile method to manipulate the planar strain in ultrathin noble metal nanosheets by constructing amorphous-crystalline phase boundaries that can expose the active strained interfaces. Geometric-phase analysis and electron diffraction profile demonstrate the in-plane amorphous-crystalline boundaries can induce about 4% surface tensile strain in the nanosheets. The strained Ir nanosheets display substantially enhanced intrinsic activity toward the hydrogen evolution reaction electrocatalysis with a turnover frequency value 4.5-fold higher than the benchmark Pt/C catalyst. Density functional theory calculations verify that the tensile strain optimizes the d-band states and hydrogen adsorption properties of the strained Ir nanosheets to improve catalysis. Furthermore, the in-plane strain engineering method is demonstrated to be a general approach to boost the hydrogen evolution performance of Ru and Rh nanosheets.
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Affiliation(s)
- Geng Wu
- Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China
| | - Xiao Han
- Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China
| | - Jinyan Cai
- Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China
| | - Peiqun Yin
- Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China
| | - Peixin Cui
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu, 210008, P.R. China
| | - Xusheng Zheng
- National Synchrotron Radiation Laboratory (NSRL), University of Science and Technology of China, Hefei, Anhui, 230029, P.R. China
| | - Hai Li
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Technology University, Nanjing, Jiangsu, 211816, P.R. China
| | - Cai Chen
- Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China
| | - Gongming Wang
- Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China.
| | - Xun Hong
- Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China.
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8
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Marzec B, Walker J, Jhons Y, Meldrum FC, Shaver M, Nudelman F. Micron-sized biogenic and synthetic hollow mineral spheres occlude additives within single crystals. Faraday Discuss 2022; 235:536-550. [PMID: 35388821 PMCID: PMC9281370 DOI: 10.1039/d1fd00095k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 12/07/2021] [Indexed: 11/21/2022]
Abstract
Incorporating additives within host single crystals is an effective strategy for producing composite materials with tunable mechanical, magnetic and optical properties. The type of guest materials that can be occluded can be limited, however, as incorporation is a complex process depending on many factors including binding of the additive to the crystal surface, the rate of crystal growth and the stability of the additives in the crystallisation solution. In particular, the size of occluded guests has been restricted to a few angstroms - as for single molecules - to a few hundred nanometers - as for polymer vesicles and particles. Here, we present a synthetic approach for occluding micrometer-scale objects, including high-complexity unicellular organisms and synthetic hollow calcite spheres within calcite single crystals. Both of these objects can transport functional additives, including organic molecules and nanoparticles that would not otherwise occlude within calcite. Therefore, this method constitutes a generic approach using calcite as a delivery system for active compounds, while providing them with effective protection against environmental factors that could cause degradation.
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Affiliation(s)
- Bartosz Marzec
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, The King's Buildings, David Brewster Road, Edinburgh EH9 3FJ, UK.
- JEOL UK Ltd, 1-2 Silver Court, Watchmead, Welwyn Garden City, AL7 1LT, UK
| | - Jessica Walker
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, The King's Buildings, David Brewster Road, Edinburgh EH9 3FJ, UK.
- Beamline I14, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
| | - Yasmeen Jhons
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, The King's Buildings, David Brewster Road, Edinburgh EH9 3FJ, UK.
| | - Fiona C Meldrum
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
| | - Michael Shaver
- Department of Materials, School of Natural Sciences, The University of Manchester, UK
| | - Fabio Nudelman
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, The King's Buildings, David Brewster Road, Edinburgh EH9 3FJ, UK.
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Direct assessment of confinement effect in zeolite-encapsulated subnanometric metal species. Nat Commun 2022; 13:821. [PMID: 35145095 PMCID: PMC8831493 DOI: 10.1038/s41467-022-28356-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 01/13/2022] [Indexed: 11/16/2022] Open
Abstract
Subnanometric metal species confined inside the microporous channels/cavities of zeolites have been demonstrated as stable and efficient catalysts. The confinement interaction between the metal species and zeolite framework has been proposed to play the key role for stabilization, though the confinement interaction is elusive to be identified and measured. By combining theoretical calculations, imaging simulation and experimental measurements based on the scanning transmission electron microscopy-integrated differential phase contrast imaging technique, we have studied the location and coordination environment of isolated iridium atoms and clusters confined in zeolite. The image analysis results indicate that the local strain is intimately related to the strength of metal-zeolite interaction and a good correlation is found between the zeolite deformation energy, the charge state of the iridium species and the local absolute strain. The direct observation of confinement with subnanometric metal species encapsulated in zeolites provides insights to understand their structural features and catalytic consequences. Zeolite-encapsulated metal nanoparticles have important catalytic properties, but their effect on the zeolite local structure has been difficult to characterize. Here the authors, using DFT calculations and scanning transmission electron microscopy, characterize the local strain due to confinement effects in metal-zeolite catalysts.
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Abstract
Strain can be a useful handle to alter the catalytic properties of strain-sensitive metals (orange).
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Affiliation(s)
- Yucheng He
- Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People's Republic of China
| | - Pengqi Hai
- Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People's Republic of China
| | - Chao Wu
- Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People's Republic of China
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Li C, Yan S, Fang J. Construction of Lattice Strain in Bimetallic Nanostructures and Its Effectiveness in Electrochemical Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2102244. [PMID: 34363320 DOI: 10.1002/smll.202102244] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 06/09/2021] [Indexed: 06/13/2023]
Abstract
Bimetallic nanocrystals (NCs), associated with various surface functions such as ligand effect, ensemble effect, and strain effect, exhibit superior electrocatalytic properties. The stress-induced surface strain effect can alter binding strength between the surface active sites and reactants as well as their intermediates, and the electrochemical performance of bimetallic NCs can be significantly facilitated by the lattice-strain modification via their morphologies, sizes, shell-thickness, surface defectiveness as well as compositions. In this review, an overview of fundamental principles, characterization techniques, and quantitative determination of the surface lattice strain is provided. Various strategies and synthesis efforts on creating lattice-strain-engineered bimetallic NCs, including the de-alloying process, atomic layer-by-layer deposition, thermal treatment evolution, one-pot synthesis, and other efforts are also discussed. It is further outlined how the lattice strain effect promotes electrochemical catalysis through the selected case studies. The reactions on oxygen reduction reaction, small molecular oxidation, water splitting reaction, and electrochemical carbon dioxide reduction reactions are focused. In particular, studies of lattice strain arisen from core-shell nanostructure and defectiveness are highlighted. Lastly, the potential challenges are summarized and the prospects of lattice-strain-based engineering on bimetallic nanocatalysts with suggestion and guidance of the future electrocatalyst design are envisioned.
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Affiliation(s)
- Can Li
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Shaohui Yan
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Jiye Fang
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, 13902, USA
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12
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Nelli D, Roncaglia C, Ferrando R, Minnai C. Shape Changes in AuPd Alloy Nanoparticles Controlled by Anisotropic Surface Stress Relaxation. J Phys Chem Lett 2021; 12:4609-4615. [PMID: 33971714 DOI: 10.1021/acs.jpclett.1c00787] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The shape of AuPd nanoparticles is engineered by surface stress relaxation, achieved by varying the Au content in nanoparticles of Pd-rich compositions. AuPd nanoparticles are grown in the gas phase for several compositions and growth conditions. Their structure is atomically resolved by HRTEM/STEM and EDX. In pure Pd distributions the dominant structures are FCC truncated octahedra (TO), while increasing the Au content there is a transition to icosahedral (Ih) structures in which Au atoms are preferentially placed at the nanoparticle surface. The transition is sharper for growth conditions closer to equilibrium. The physical origin of the transition is determined with the aid of computer simulations. Global optimization searches and free energy calculations confirm that Ih become the equilibrium structure for increasing the Au content. Atomic stress calculations demonstrate that the TO → Ih shape change is caused by a better relaxation of anisotropic surface stress in icosahedra.
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Affiliation(s)
- Diana Nelli
- Dipartimento di Fisica, Universitá di Genova, via Dodecaneso 33, Genova 16146, Italy
| | - Cesare Roncaglia
- Dipartimento di Fisica, Universitá di Genova, via Dodecaneso 33, Genova 16146, Italy
| | - Riccardo Ferrando
- Dipartimento di Fisica, Universitá di Genova and CNR-IMEM, via Dodecaneso 33, Genova 16146, Italy
| | - Chloé Minnai
- Molecular Cryo-Electron Microscopy Unit, Okinawa Institute of Science and Technology Graduate University Onna-son, Kunigami-gun, Okinawa 904-0495, Japan
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Baskaran S, Xu CQ, Jiang YF, Wang YG, Li J. Phosphorene Supported Single-Atom Catalysts for CO Oxidation: A Computational Study. Chemphyschem 2021; 22:378-385. [PMID: 33289945 DOI: 10.1002/cphc.202000950] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Indexed: 10/22/2022]
Abstract
Single-atom catalysts (SACs) have attracted extensive attention owing to their high catalytic activity. The development of efficient SACs is crucial for applications in heterogeneous catalysis. In this article, the geometric configuration, electronic structure, stabilitiy and catalytic performance of phosphorene (Pn) supported single metal atoms (M=Ru, Rh, Pd, Ir, Pt, and Au) have been systematically investigated using density functional theory calculations and ab initio molecular dynamics simulations. The single atoms are found to occupy the hollow site of phosphorene. Among the catalysts studied, Ru-decorated phosphorene is determined to be a potential catalyst by evaluating adsorption energies of gaseous molecules. Various mechanisms including the Eley-Rideal (ER), Langmuir-Hinshelwood (LH) and trimolecular Eley-Rideal (TER) mechanisms are considered to validate the most favourable reaction pathway. Our results reveal that Ru-Pn exhibits outstanding catalytic activity toward CO oxidation reaction via TER mechanism with the corresponding rate-determining energy barrier of 0.44 eV, making it a very promising SAC for CO oxidation under mild conditions. Overall, this work may provide a new avenue for the design and fabrication of two-dimensional materials supported SACs for low-temperature CO oxidation.
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Affiliation(s)
- Sambath Baskaran
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Cong-Qiao Xu
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Ya-Fei Jiang
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Yang-Gang Wang
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Jun Li
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China.,Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, China
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14
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Liu J, Zhang J. Nanointerface Chemistry: Lattice-Mismatch-Directed Synthesis and Application of Hybrid Nanocrystals. Chem Rev 2020; 120:2123-2170. [DOI: 10.1021/acs.chemrev.9b00443] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jia Liu
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, P.R. China
| | - Jiatao Zhang
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, P.R. China
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15
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Suzuki R, Onodera T, Kasai H, Oikawa H. Chemical modification utilizing a terminal structure exposed on the specific surface of polymer-metal complex nanocrystals. RSC Adv 2020; 10:6135-6138. [PMID: 35496015 PMCID: PMC9049687 DOI: 10.1039/c9ra10244b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 01/17/2020] [Indexed: 11/21/2022] Open
Abstract
It has been difficult to selectively modify the surface of molecular crystals by chemical reactions because they usually have no reaction points on their surfaces. In this paper, focusing on the unique nanocrystal surface of the polymer metal complex (PMC) [{Cu2(μ-Br)2(PPh3)2}(μ-bpy)]n having an exposed reactive terminal chain, we successfully modified the surface of PMC nanocrystals (NCs) through an alkylation reaction. Interestingly, after the alkylation reaction, the luminescence spectrum of PMC NCs blue-shifted, and the luminescence quantum yield increased. PMC NCs with a large specific surface area showed optically peculiar or characteristic properties compared with the corresponding bulk crystals. PMC NCs have high potential as a new class of luminescent materials due to their surface effect. We modified the surface of polymer metal complex nanocrystals (PMC NCs) with the alkylation reaction by utilizing coordinatively unsaturated bipyridine ligands exposed on the (010), and successfully changed the luminescence properties of PMC NCs.![]()
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Affiliation(s)
- Ryuju Suzuki
- Institute of Multidisciplinary Research for Advanced Materials
- Tohoku University
- Sendai 980-8577
- Japan
| | - Tsunenobu Onodera
- Institute of Multidisciplinary Research for Advanced Materials
- Tohoku University
- Sendai 980-8577
- Japan
| | - Hitoshi Kasai
- Institute of Multidisciplinary Research for Advanced Materials
- Tohoku University
- Sendai 980-8577
- Japan
| | - Hidetoshi Oikawa
- Institute of Multidisciplinary Research for Advanced Materials
- Tohoku University
- Sendai 980-8577
- Japan
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16
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Linghu Y, Wu C. NO disproportionation over defective 1T′-MoS 2 monolayers. Phys Chem Chem Phys 2020; 22:13154-13159. [DOI: 10.1039/d0cp01800g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
NO disproportionation can be catalyzed by MoS2 monolayers loaded with S vacancies. When the MoS2 sheet is under 3% compressive strain, two NO molecules at a S vacancy can form a NO2. The left N atom will react with a third NO to afford N2O under 3% tensile strain.
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Affiliation(s)
- Yaoyao Linghu
- Frontier Institute of Science and Technology
- Xi'an Jiaotong University
- Xi'an 710054
- China
| | - Chao Wu
- Frontier Institute of Science and Technology
- Xi'an Jiaotong University
- Xi'an 710054
- China
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17
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Kim YY, Darkins R, Broad A, Kulak AN, Holden MA, Nahi O, Armes SP, Tang CC, Thompson RF, Marin F, Duffy DM, Meldrum FC. Hydroxyl-rich macromolecules enable the bio-inspired synthesis of single crystal nanocomposites. Nat Commun 2019; 10:5682. [PMID: 31831739 PMCID: PMC6908585 DOI: 10.1038/s41467-019-13422-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 11/05/2019] [Indexed: 11/24/2022] Open
Abstract
Acidic macromolecules are traditionally considered key to calcium carbonate biomineralisation and have long been first choice in the bio-inspired synthesis of crystalline materials. Here, we challenge this view and demonstrate that low-charge macromolecules can vastly outperform their acidic counterparts in the synthesis of nanocomposites. Using gold nanoparticles functionalised with low charge, hydroxyl-rich proteins and homopolymers as growth additives, we show that extremely high concentrations of nanoparticles can be incorporated within calcite single crystals, while maintaining the continuity of the lattice and the original rhombohedral morphologies of the crystals. The nanoparticles are perfectly dispersed within the host crystal and at high concentrations are so closely apposed that they exhibit plasmon coupling and induce an unexpected contraction of the crystal lattice. The versatility of this strategy is then demonstrated by extension to alternative host crystals. This simple and scalable occlusion approach opens the door to a novel class of single crystal nanocomposites.
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Affiliation(s)
- Yi-Yeoun Kim
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
| | - Robert Darkins
- Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK
| | - Alexander Broad
- Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK
| | - Alexander N Kulak
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Mark A Holden
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Ouassef Nahi
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Steven P Armes
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, UK
| | - Chiu C Tang
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
| | - Rebecca F Thompson
- The Astbury Biostructure Laboratory, Astbury Centre for Structural Molecular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, UK
| | - Frederic Marin
- UMR CNRS 6282 Biogeosciences, Université de Bourgogne-Franche-Comté, 6 Boulevard Gabriel, 21000, Dijon, France
| | - Dorothy M Duffy
- Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK.
| | - Fiona C Meldrum
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
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18
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Zhou C, Liang X, Hutchings GS, Jhang JH, Fishman ZS, Wu R, Gozar A, Schwarz UD, Ismail-Beigi S, Altman EI. Tuning two-dimensional phase formation through epitaxial strain and growth conditions: silica and silicate on Ni xPd 1-x(111) alloy substrates. NANOSCALE 2019; 11:21340-21353. [PMID: 31670730 DOI: 10.1039/c9nr05944j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Two-dimensional (2D) materials can have multiple phases close in energy but with distinct properties, with the phases that form during growth dependent on experimental conditions and the growth substrate. Here, the competition between 2D van der Waals (VDW) silica and 2D Ni silicate phases on NixPd1-x(111) alloy substrates was systematically investigated experimentally as a function of Si surface coverage, annealing time and temperature, O2 partial pressure, and substrate composition and the results were compared with thermodynamic predictions based on density functional theory (DFT) calculations and thermochemical data for O2. Experimentally, 2D Ni silicate was exclusively observed at higher O2 pressures (∼10-6 Torr), higher annealing temperatures (1000 K), and more prolonged annealing (10 min) if the substrate contained any Ni and for initial Si coverages up to 2 monolayers. In contrast, decreasing the O2 pressure to ∼10-8 Torr and restricting the annealing temperature and time enabled 2D VDW silica formation. Amorphous 2D VDW silica was observed even when the substrate composition was tuned to lattice match crystalline 2D VDW silica. The trend of decreased O2 pressure favoring 2D VDW silica was consistent with the theoretical predictions; however, theory also suggested that sufficient Si coverage could avoid Ni silicate formation. The effect of epitaxial strain on 2D Ni silicate was investigated by modifying the solid solution alloy substrate composition. It was found that 2D Ni silicate will stretch to match the substrate lattice constant up to 1.12% tensile strain. When the lattice mismatch was over 1.40%, incommensurate crystalline domains were observed, indicating relaxation of the overlayer to its favored lattice constant. The limited epitaxial strain that could be applied was attributed to a combination of the 2D silicate stiffness, the insensitivity of its bonding to the substrate to its alignment with the substrate, and its lack of accessible structural rearrangements that can reduce the strain energy. The results demonstrate how the resulting 2D material can be manipulated through the growth conditions and how a solid solution alloy substrate can be used to maximize the epitaxial strain imparted to the 2D system.
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Affiliation(s)
- Chao Zhou
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT 06520, USA
| | - Xin Liang
- Department of Applied Physics, Yale University, New Haven, CT 06520, USA
| | - Gregory S Hutchings
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520, USA.
| | - Jin-Hao Jhang
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520, USA.
| | - Zachary S Fishman
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520, USA.
| | - Rongting Wu
- Department of Applied Physics, Yale University, New Haven, CT 06520, USA and Energy Sciences Institute, Yale University, West Haven, CT 06516, USA
| | - Adrian Gozar
- Department of Applied Physics, Yale University, New Haven, CT 06520, USA and Energy Sciences Institute, Yale University, West Haven, CT 06516, USA
| | - Udo D Schwarz
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT 06520, USA and Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520, USA.
| | - Sohrab Ismail-Beigi
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT 06520, USA and Department of Applied Physics, Yale University, New Haven, CT 06520, USA
| | - Eric I Altman
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520, USA.
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19
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Benson EE, Ha MA, Gregg BA, van de Lagemaat J, Neale NR, Svedruzic D. Dynamic Tuning of a Thin Film Electrocatalyst by Tensile Strain. Sci Rep 2019; 9:15906. [PMID: 31685891 PMCID: PMC6828675 DOI: 10.1038/s41598-019-52245-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 10/03/2019] [Indexed: 11/25/2022] Open
Abstract
We report the ability to tune the catalytic activities for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by applying mechanical stress on a highly n-type doped rutile TiO2 films. We demonstrate through operando electrochemical experiments that the low HER activity of TiO2 can reversibly approach those of the state-of-the-art non-precious metal catalysts when the TiO2 is under tensile strain. At 3% tensile strain, the HER overpotential required to generate a current density of 1 mA/cm2 shifts anodically by 260 mV to give an onset potential of 125 mV, representing a drastic reduction in the kinetic overpotential. A similar albeit smaller cathodic shift in the OER overpotential is observed when tensile strain is applied to TiO2. Results suggest that significant improvements in HER and OER activities with tensile strain are due to an increase in concentration of surface active sites and a decrease in kinetic and thermodynamics barriers along the reaction pathway(s). Our results highlight that strain applied to TiO2 by precisely controlled and incrementally increasing (i.e. dynamic) tensile stress is an effective tool for dynamically tuning the electrocatalytic properties of HER and OER electrocatalysts relative to their activities under static conditions.
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Affiliation(s)
- Eric E Benson
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Mai-Anh Ha
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Brian A Gregg
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | | | - Nathan R Neale
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
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20
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Xiang R, Peng L, Wei Z. Tuning Interfacial Structures for Better Catalysis of Water Electrolysis. Chemistry 2019; 25:9799-9815. [DOI: 10.1002/chem.201901168] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Rui Xiang
- Chongqing Key Laboratory of Chemical Process for Clean Energy, and Resource Utilization, School of Chemistry and Chemical EngineeringChongqing University No.55 Daxuecheng South Rd., Shapingba Chongqing 401331 P.R. China
| | - Lishan Peng
- Chongqing Key Laboratory of Chemical Process for Clean Energy, and Resource Utilization, School of Chemistry and Chemical EngineeringChongqing University No.55 Daxuecheng South Rd., Shapingba Chongqing 401331 P.R. China
| | - Zidong Wei
- Chongqing Key Laboratory of Chemical Process for Clean Energy, and Resource Utilization, School of Chemistry and Chemical EngineeringChongqing University No.55 Daxuecheng South Rd., Shapingba Chongqing 401331 P.R. China
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21
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22
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Yun J, Zhang Y, Ren Y, Xu M, Yan J, Zhao W, Zhang Z. Tunable band gap of graphyne-based homo- and hetero-structures by stacking sequences, strain and electric field. Phys Chem Chem Phys 2018; 20:26934-26946. [PMID: 30283931 DOI: 10.1039/c8cp03533d] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A comprehensive investigation was carried out on graphyne/graphyne (Gyne/Gyne), graphyne-like BN/graphyne-like BN (BNyne/BNyne) and graphyne/graphyne-like BN (Gyne/BNyne) bilayer structures using van der Waals (vdW)-corrected density functional theory. These bilayers exhibited distinct stacking-dependent characteristics in their ground state electronic structure and also had different responses to external strain and a vertical electric field. For the Gyne/Gyne and Gyne/BNyne bilayers, the application of biaxial tensile strain led to an increase in the band gap, while the application of biaxial compressive strain in addition to uniaxial strain, either under tension or compression, induced a reduction in the band gap. However, in the case of the BNyne/BNyne bilayer, the application of biaxial tensile strain led to a decrease in the band gap, but an increase in the band gap occurred under biaxial compressive strain, which could be explained by a change in the ionic nature of the B-N bonds. Under a vertical electric field, the band gaps of the homo-bilayers (Gyne/Gyne and BNyne/BNyne) decreased and were symmetrical. However, the hetero-bilayer (Gyne/BNyne) exhibited a decreased band gap under a positive electric field, but an almost constant band gap under a negative electric field. The physical origin of the band gap variation under an electric field was unraveled using energy-band theory. Our findings pave the way for experimental research and provide valuable insight into two-dimensional vdW layered structures for use in next generation flexible nanoelectronics and optoelectronic devices.
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Affiliation(s)
- Jiangni Yun
- School of Information Science and Technology, Northwest University, Xi'an, 710127, P. R. China.
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23
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Wang S, Xiong L, Bi J, Zhang X, Yang G, Yang S. Structural and Electronic Stabilization of PtNi Concave Octahedral Nanoparticles by P Doping for Oxygen Reduction Reaction in Alkaline Electrolytes. ACS APPLIED MATERIALS & INTERFACES 2018; 10:27009-27018. [PMID: 30040371 DOI: 10.1021/acsami.8b07742] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The enhancement in the catalytic activity of PtM (transition metals, TMs) alloy nanoparticles (NPs) results from the electronic structure of Pt being modified by the TM. However, the oxidation of the TM would lead to the electronegativity difference between Pt and TM being much lowered, which induces a decrease in the number of electrons transferred from the TM to Pt, resulting in excessive oxygenated species accumulating on the surface of Pt, thus deteriorating their performance. In this work, the oxygen reduction reaction (ORR) performance of PtNi (Pt68Ni32) concave octahedral NPs (CONPs) in alkaline electrolytes is much improved by doping small amounts of phosphorus. The P-doped PtNi CONPs (P-PtNi) show about 2 and 10 times enhancement for ORR compared to PtNi and commercial Pt/C catalysts. The high-angle annular dark-field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy mapping characterizations reveal that the P dopant uniformly distributes throughout the CONPs, Pt mainly locates at the edges and corners, whereas Ni situates at the center, forming a P-doped Pt-frame@Ni quasi-core-shell CONP. The X-ray photoelectron spectroscopy spectra indicate that the P dopant obviously increases the electron density of Pt compared with that of PtNi NPs, which contributes to the stabilization of the electronic structure of PtNi CONPs, thus restraining the excessive HO2- species produced on the catalysts, which endow them with a high catalytic performance in the ORR. In addition, the P attached to the Ni sites in the PtNi NPs partially prevents the Ni atoms being oxidized by the external O species, which is conducive to the structural and electrochemical stability of the PtNi NPs during the ORR. The present results provide a new insight into the development of ORR catalysts with low utilization of Pt.
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Affiliation(s)
| | | | | | | | | | - Shengchun Yang
- Collaborative Innovation Center of Suzhou Nano Science and Technology , Suzhou Academy of Xi'an Jiaotong University , 215000 Suzhou , People's Republic of China
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24
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Evazzade I, Lobzenko IP, Saadatmand D, Korznikova EA, Zhou K, Liu B, Dmitriev SV. Graphene nanoribbon as an elastic damper. NANOTECHNOLOGY 2018; 29:215704. [PMID: 29488901 DOI: 10.1088/1361-6528/aab2f4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Heterostructures composed of dissimilar two-dimensional nanomaterials can have nontrivial physical and mechanical properties which are potentially useful in many applications. Interestingly, in some cases, it is possible to create heterostructures composed of weakly and strongly stretched domains with the same chemical composition, as has been demonstrated for some polymer chains, DNA, and intermetallic nanowires supporting this effect of two-phase stretching. These materials, at relatively strong tension forces, split into domains with smaller and larger tensile strains. Within this region, average strain increases at constant tensile force due to the growth of the domain with the larger strain, at the expense of the domain with smaller strain. Here, the two-phase stretching phenomenon is described for graphene nanoribbons with the help of molecular dynamics simulations. This unprecedented feature of graphene that is revealed in our study is related to the peculiarities of nucleation and the motion of the domain walls separating the domains of different elastic strain. It turns out that the loading-unloading curves exhibit a hysteresis-like behavior due to the energy dissipation during the domain wall nucleation and motion. Here, we put forward the idea of implementing graphene nanoribbons as elastic dampers, efficiently converting mechanical strain energy into heat during cyclic loading-unloading through elastic extension where domains with larger and smaller strains coexist. Furthermore, in the regime of two-phase stretching, graphene nanoribbon is a heterostructure for which the fraction of domains with larger and smaller strain, and consequently its physical and mechanical properties, can be tuned in a controllable manner by applying elastic strain and/or heat.
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Affiliation(s)
- Iman Evazzade
- Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
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25
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Kim SM, Lee SY. The plasma-induced formation of silver nanocrystals in aqueous solution and their catalytic activity for oxygen reduction. NANOTECHNOLOGY 2018; 29:085602. [PMID: 29283110 DOI: 10.1088/1361-6528/aaa443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ag nanocrystals with different architectures are synthesized using a submerged plasma discharge without the involvement of any chemicals. The Ag architecture relies on the electron density in the plasma that could enable the Ag ions to be reduced instantaneously to generate a large number of small Ag nanoparticles. With a low electron density of 7.1 × 10-22 m-3, the Ag nanowires with a corrugated structure induced by twinning and stacking faults are formed along the entire longitudinal 〈111〉 direction. However, with a high electron density 13.7 × 10-22 m-3, the Ag nanodendrites are constructed with a defect-free structure. Due to the unique structure composed of twins and stacking faults, the Ag nanowires show a specific current density that is 2.7 times higher than the Ag nanodendrites towards the oxygen reduction reaction. This work not only suggests a synthetic route to the formation of nanowires with structural defects but also offers a rational design of electrocatalysts with enhanced catalytic activity.
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Affiliation(s)
- Sung-Min Kim
- Surface R&D Group, Korea Institute of Industrial Technology, Incheon, 21999, Republic of Korea
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26
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Fan J, Xu B, Zhao JZ, Xu H. Controllable dissociation of H2O on a CeO2(111) surface. Phys Chem Chem Phys 2018; 20:1575-1582. [DOI: 10.1039/c7cp06117j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The lattice strain is an effective approach to tune the adsorption states of H2O on metal oxide surfaces.
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Affiliation(s)
- J. Fan
- Department of Physics
- Southern University of Science and Technology
- Shenzhen 518055
- China
| | - B. Xu
- Physics Department and Institute for Nanoscience and Engineering
- University of Arkansas
- Fayetteville
- USA
| | - J. Z. Zhao
- Department of Physics
- Southern University of Science and Technology
- Shenzhen 518055
- China
| | - H. Xu
- Department of Physics
- Southern University of Science and Technology
- Shenzhen 518055
- China
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27
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Xue T, Wu C, Ding X, Sun J. Dissociative adsorption of O2 on strained Pt(111). Phys Chem Chem Phys 2018; 20:17927-17933. [DOI: 10.1039/c8cp01966e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The adsorption and dissociation of O2 and the adsorption of O* adatoms over strained Pt(111) surfaces have been systematically studied using density functional theory calculations.
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Affiliation(s)
- Tiantian Xue
- Frontier Institute of Science and Technology
- State Key Laboratory for Mechanical Behavior of Materials
- Xi’an Jiaotong University
- Xi’an 710049
- People's Republic of China
| | - Chao Wu
- Frontier Institute of Science and Technology
- State Key Laboratory for Mechanical Behavior of Materials
- Xi’an Jiaotong University
- Xi’an 710049
- People's Republic of China
| | - Xiangdong Ding
- Frontier Institute of Science and Technology
- State Key Laboratory for Mechanical Behavior of Materials
- Xi’an Jiaotong University
- Xi’an 710049
- People's Republic of China
| | - Jun Sun
- Frontier Institute of Science and Technology
- State Key Laboratory for Mechanical Behavior of Materials
- Xi’an Jiaotong University
- Xi’an 710049
- People's Republic of China
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