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Zhang Y, Han S, Zhu S, Chen R, Li T, Lyu Z, Zhao M, Gu M, Shao M, Xia Y. Slowly Removing Surface Ligand by Aging Enhances the Stability of Pd Nanosheets toward Electron Beam Irradiation and Electrocatalysis. Angew Chem Int Ed Engl 2023; 62:e202314634. [PMID: 37955915 DOI: 10.1002/anie.202314634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/11/2023] [Accepted: 11/13/2023] [Indexed: 11/14/2023]
Abstract
Surface ligands play an important role in shape-controlled growth and stabilization of colloidal nanocrystals. Their quick removal tends to cause structural deformation and/or aggregation to the nanocrystals. Herein, we demonstrate that the surface ligand based on poly(vinylpyrrolidone) (PVP) can be slowly removed from Pd nanosheets (NSs, 0.93±0.17 nm in thickness) by simply aging the colloidal suspension. The aged Pd NSs show well-preserved morphology, together with significantly enhanced stability toward both e-beam irradiation and electrocatalysis (e.g., ethanol oxidation). It is revealed that the slow desorption of PVP during aging forces the re-exposed Pd atoms to reorganize, facilitating the surface to transform from being nearly perfect to defect-rich. The resultant Pd NSs with abundant defects no longer rely on surface ligand to stabilize the atomic arrangement and thus show excellent structural and electrochemical stability. This work provides a facile and effective method to maintain the integrity of colloidal nanocrystals by slowly removing the surface ligand.
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Affiliation(s)
- Yu Zhang
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Emory University, 30332, Atlanta, GA, USA
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
- School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, China
| | - Shaobo Han
- Department of Materials Science and Engineering, Southern University of Science and Technology, 518055, Shenzhen, P. R. China
| | - Shangqian Zhu
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Ruhui Chen
- School of Chemistry and Biochemistry, Georgia Institute of Technology, 30332, Atlanta, GA, USA
| | - Tiehuai Li
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Zhiheng Lyu
- School of Chemistry and Biochemistry, Georgia Institute of Technology, 30332, Atlanta, GA, USA
| | - Ming Zhao
- School of Chemistry and Biochemistry, Georgia Institute of Technology, 30332, Atlanta, GA, USA
| | - Meng Gu
- Department of Materials Science and Engineering, Southern University of Science and Technology, 518055, Shenzhen, P. R. China
| | - Minhua Shao
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Younan Xia
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Emory University, 30332, Atlanta, GA, USA
- School of Chemistry and Biochemistry, Georgia Institute of Technology, 30332, Atlanta, GA, USA
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Javed A, Palafox Gonzalez P, Thangadurai V. A Critical Review of Electrolytes for Advanced Low- and High-Temperature Polymer Electrolyte Membrane Fuel Cells. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37326582 DOI: 10.1021/acsami.3c02635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
In the 21st century, proton exchange membrane fuel cells (PEMFCs) represent a promising source of power generation due to their high efficiency compared with coal combustion engines and eco-friendly design. Proton exchange membranes (PEMs), being the critical component of PEMFCs, determine their overall performance. Perfluorosulfonic acid (PFSA) based Nafion and nonfluorinated-based polybenzimidazole (PBI) membranes are commonly used for low- and high-temperature PEMFCs, respectively. However, these membranes have some drawbacks such as high cost, fuel crossover, and reduction in proton conductivity at high temperatures for commercialization. Here, we report the requirements of functional properties of PEMs for PEMFCs, the proton conduction mechanism, and the challenges which hinder their commercial adaptation. Recent research efforts have been focused on the modifications of PEMs by composite materials to overcome their drawbacks such as stability and proton conductivity. We discuss some current developments in membranes for PEMFCs with special emphasis on hybrid membranes based on Nafion, PBI, and other nonfluorinated proton conducting membranes prepared through the incorporation of different inorganic, organic, and hybrid fillers.
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Affiliation(s)
- Aroosa Javed
- Department of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4, Canada
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Rohani R, Pakizeh M, Chenar MP. Toluene/water separation using MCM-41/ PEBA mixed matrix membrane via pervaporation process. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120988] [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]
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4
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Li W, Chen C, Liu X, Li X, Jiang X, Liu X, Yang J, Liu J. Continuous graphene oxide nanolayer arranged on hydrophilic modified polytetrafluoroethylene substrate to construct high performance proton exchange membranes. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Wei G, Liang Y, Wang Y, Liu X, Wang L. Achieving high power density of 859.5 mW cm−2: Self-cross-linking polymer membrane based on rigid fluorenone structure. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Oroujzadeh M, Mehdipour‐Ataei S. Evaluation of properties and performance of poly(ether sulfone ketone) membranes in proton exchange membrane fuel cells. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5756] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Maryam Oroujzadeh
- Faculty of Polymer Science, Department of Polyurethane and Advanced Materials Iran Polymer and Petrochemical Institute Tehran Iran
| | - Shahram Mehdipour‐Ataei
- Faculty of Polymer Science, Department of Polyurethane and Advanced Materials Iran Polymer and Petrochemical Institute Tehran Iran
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Li W, Wang H, Zhang J, Xiang Y, Lu S. Advancements of Polyvinylpyrrolidone-Based Polymer Electrolyte Membranes for Electrochemical Energy Conversion and Storage Devices. CHEMSUSCHEM 2022; 15:e202200071. [PMID: 35318798 DOI: 10.1002/cssc.202200071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 03/12/2022] [Indexed: 06/14/2023]
Abstract
Polymer electrolyte membranes (PEMs) play vital roles in electrochemical energy conversion and storage devices, such as polymer electrolyte membrane fuel cell (PEMFC), redox flow battery, and water electrolysis. As the crucial component of these devices, PEMs need to possess high ion conductivity and electronic insulation, remarkable mechanical and chemical stability, and outstanding isolation function for the materials on both sides of the cathode and anode. Polyvinylpyrrolidone has received widespread attention in the research of PEMs owing to its tertiary amine basic groups and exceptional hydrophilic properties. This review focuses on the application status of polyvinylpyrrolidone-based PEMs in PEMFC, vanadium redox flow battery, and alkaline water electrolysis, and describes in detail the key scientific problems in these fields, providing constructive suggestions and guidance for the application of polyvinylpyrrolidone-based PEMs in electrochemical energy conversion and storage devices.
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Affiliation(s)
- Wen Li
- Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing, 100191, P. R. China
| | - Haining Wang
- Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing, 100191, P. R. China
| | - Jin Zhang
- Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing, 100191, P. R. China
| | - Yan Xiang
- Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing, 100191, P. R. China
| | - Shanfu Lu
- Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing, 100191, P. R. China
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