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High-throughput synthesis of size-controlled Pt-based catalysts

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Particuology 2023年第12期83卷 232-240页

作者： Zhuoran Deng Liqiang Zhao Daojian Cheng State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China College of Information Science and Technology Beijing University of Chemical TechnologyBeijing100029China

pt catalysts are commonly used for chemical reaction processes due to its high catalytic activity and selectivity.Notably,the size of metal particles often has a significant impact on the performance of the metal-loaded catalysts.Therefore,developing highly efficiently synthesis method for the size control of pt catalysts has great development prospects and research value.In this study,high-throughput size tuning of Pt-based catalysts was achieved by carbonizing the carriers.The experimental and characterization results showed that the size of the loaded pt nanoparticles varied with different concentrations of glucose solution during carriers carbonization process.The reduction of 4-nitrophenol as a template reaction indicated that the reaction rate constant of the catalyst is approximately linear with the size of pt particles.Importantly,a laboratory-built high-throughput synthesis system was applied for the catalyst synthesis,which enhances the automation of the laboratory exploratory experiments and makes it possible to synthesize catalysts with controllable size in batches.

关键词： High-throughput synthesis Size modulation Pt-based catalysts 4-Nitrophenol reduction

Recent progress of pt-based oxygen reduction reaction catalysts for proton exchange membrane fuel cells

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Rare Metals 2024年第6期43卷 2444-2468页

作者： Feng Zhan Kun-Song Hu Jin-Hua Mai Li-Sheng Zhang Zhen-Guo Zhang Huan He Xin-Hua Liu School of Resources Environment and MaterialsGuangxi University School of Transportation Science and Engineering Beihang University IDTECH (Suzhou) Co.Ltd Dyson School of Design Engineering Imperial College London

With the increasing consumption of fossil fuels,proton exchange membrane fuel cells(PEMFCs) have attracted considerable attention as green and sustainable energy conversion devices.The slow kinetics of the cathodic oxygen reduction reaction(ORR) has a major impact on the performance of PEMFCs,and although platinum(pt) can accelerate the reaction rate of the ORR,the scarcity and high cost of pt resources still limit the development of PEMFCs.Therefore,the development of low-cost high-performance ORR catalysts is essential for the commercial application and development of PEMFCs.This paper reviews the research progress of researchers on pt-based ORR catalysts in recent years,including pt/C catalysts,pt-based alloy catalysts,pt-based intermetallic compounds,and pt-based single-atom catalysts(SACs),with a focus on pt-based alloy catalysts with different nanostructures.We described in detail the difficulties and solutions in the research process of various ORR catalysts and explained the principle of their activity enhancement with density functional theory(DFT).In addition,an outlook on the development of Pt-based catalysts is given,and reducing the amount of pt used and improving the performance of catalysts are the directions to work on in the coming period.

关键词： Pt-based catalysts PEMFCs pt-based intermetallic compounds Single-atom catalysts

Efficient bifunctional catalysts of CoSe/N-doped carbon nanospheres supported pt nanoparticles for methanol electrolysis of hydrogen generation

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Nano Research 2022年第10期15卷 8936-8945页

作者： Yang Zhou Qiaowei Wang Xinlong Tian Ligang Feng School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China

Methanol electrolysis is significant but challenging as an energy-saving technique for electrochemical hydrogen production.Herein,we demonstrated a novel and efficient bifunctional catalyst of CoSe/N-doped carbon nanospheres supported pt nanoparticles for hydrogen generation via methanol electrolysis;high catalytic performance for both methanol oxidation(MOR)and hydrogen evolution(HER)was observed benefitting from the effective interaction of metal and support effect as well as the oxophilic characteristics of cobalt selenide.Theoretical calculation disclosed the increased charge density of pt induced by the CoSe/NC support has a bifunctional ability for optimizing the H*adsorption energy for hydrogen evolution reaction and weakening the CO adsorption energy of methanol oxidation reaction.Specifically,the largely improved CO-tolerance ability was observed in the CO-stripping technique,where about 90 mV less of the peak potential for CO oxidation than that of pt/C catalyst was observed,resulting from a strong electronic effect as indicated by the spectroscopic analysis.The peak current density of 84.2 mA·cm^(–2) was found for MOR,which was about 3.1 times higher than that of pt/C;and a low overpotential of 32 mV was required to reach 10 mA·cm^(–2) for HER in 0.5 mol·L^(–1) H_(2)SO_(4) with 1.0 mol·L^(–1) CH3OH.When serviced as both anode and cathode catalyst in a methanol electrolyzer,a low cell potential of 0.67 V to offer 10 mA cm^(-2) was obtained,about 170 mV less than that of pt/C catalyst;moreover,it was 1.1 V lower than that of water-splitting(1.77 V),indicating a promising energy-saving technique for hydrogen generation.They also showed very good catalytic stability and anti-poisoning ability during the catalysis process.This work would help understand the metal-support interaction for hydrogen generation vis methanol electrolysis.

关键词： bifunctional electrocatalyst methanol electrolysis hydrogen evolution reaction Pt-based catalysts metal-organic frameworks

Tuning metal-support interaction of pt-based electrocatalysts for hydrogen energy conversion

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Science China Chemistry 2023年第12期66卷 3398-3414页

作者： Shenzhou Li Tanyuan Wang Qing Li State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518000China

pt-based electrocatalysts hold great promise for key electrocatalytic reactions in hydrogen-related energy conversion devices.Generally,the catalytic performance is significantly influenced by metal-support interactions(MSI)in the catalysts,making the tuning of MSI in Pt-based catalysts a highly intriguing research focus.In this review,the catalytic mechanism of pt-based electrocatalysts is firstly introduced.Subsequently,the effects of MSI on supported pt electrocatalysts are summarized into four types:geometric effects,electronic effects,synergistic effects,and structural reconfiguration.Finally,the prospect of optimizing the performance of pt-based electrocatalysts by engineering MSI is exhibited,with the aim of inspiring innovation and advancement of supported pt catalysts,thereby facilitating the development and utilization of hydrogen energy.

关键词： metal-support interaction Pt-based catalysts electrocatalysis hydrogen evolution reaction oxygen reduction reaction

Strain engineering of pt-based electrocatalysts for oxygen reaction reduction

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Frontiers in Energy 2024年第2期18卷 241-262页

作者： Zeyu WANG Yanru LIU Shun CHEN Yun ZHENG Xiaogang FU Yan ZHANG Wanglei WANG State Key Laboratory of Solidification Processing Atomic Control and Catalysis Engineering LaboratorySchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration National Clinical Research Center for Oral DiseasesShaanxi Key Laboratory of StomatologyDepartment of Dental MaterialsSchool of StomatologyThe Fourth Military Medical UniversityXi’an 710032China Institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Key Laboratory of Marine Chemistry Theory and Technology(Ministry of Education) College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China

Proton exchange membrane fuel cells(PEMFCs)are playing irreplaceable roles in the construction of the future sustainable energy system.However,the insufficient performance of platinum(pt)-based electrocatalysts for oxygen reduction reaction(ORR)hinders the overall efficiency of PEMFCs.Engineering the surface strain of catalysts is considered an effective way to tune their electronic structures and therefore optimize catalytic behavior.In this paper,insights into strain engineering for improving Pt-based catalysts toward ORR are elaborated in detail.First,recent advances in understanding the strain effects on ORR catalysts are comprehensively discussed.Then,strain engineering methodologies for adjusting ptbased catalysts are comprehensively discussed.Finally,further information on the various challenges and potential prospects for strain modulation of Pt-based catalysts is provided.

关键词： strain engineering Pt-based catalysts oxygen reduction reaction(ORR) catalytic performance proton exchange membrane fuel cells(PEMFCs)

In situ preparation and the characterization of pt/SnO_2

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Chinese Chemical Letters 2012年第3期23卷 371-374页

作者： Jian She Wang Jiao Jiao Li Chang Chun Yang School of Chemical Engineering and Energy Zhengzhou UniversityZhengzhou 450000China Department of Chemistry Zhengzhou UniversityZhengzhou 450000China

To enhance the cycling stability of Pt-based catalysts,the anti-corrosion property of support and the attachment of pt with support should both get improved.For this purpose,a novel method is presented for in situ preparing pt/SnO_2.The structure of pt/ SnO_2 is characterized by X-ray diffraction（XRD） and transmission electron microscopy（TEM）,confirming the homogeneous deposition of pt on SnO_2.The high resolution TEM（HRTEM） shows the large interfaces between pt and SnO_2.The TEM photos recorded after accelerated durability tests with pt/SnO_2 show that the agglomeration and size increment of pt particles is not severe, indicating the good stability of pt/SnO_2.The electrochemical active surface area（EAS） of pt/SnO_2 keeps increasing during the 1000 cycles of cyclic voltammetric（CV） sweeping in H_2SO_4,while the EAS decayed by 35%when mixing pt/SnO_2 with carbon nanotubes（CNTs）,indicating the superior anti-corrosion property of SnO_2 in contrast to CNTs.

关键词： Pt-based catalysts Tin dioxide In situ preparation Stability

Enhanced ORR performance of pt catalysts in acidic media by coupling with topological C defects

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The Innovation 2021年第4期2卷 65-71页

作者： Yan Dong Yuan Wang Ziqi Tian Kemin Jiang Yanle Li Yichao Lin Colin W.Oloman Elod L.Gyenge Jianwei Su Liang Chen Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China Department of Chemical and Biological Engineering Clean Energy Research Center(CERC)The University of British ColumbiaVancouver V6T 1Z3Canada Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Ministry of Education)Anhui UniversityHefeiAnhui 230601China

Defect engineering is a promising strategy for supported catalysts to improve the catalytic activity and durability.Here,we selected the Cmatrix enriched with topological defects to serve as the substrate material,in which the topological defects can act as anchoring centers to trappt nanoparticles for driving the O_(2) reduction reactions(ORRs).Both experimental characterizations and theoretical simulations revealed the strong ptdefect interaction with enhanced charge transfer on the interface.Despite a low pt loading,the supported catalyst can still achieve a remarkable 55 mV positive shift of half-wave potential toward ORR in O_(2)-saturated 0.1 M HClO_(4) electrolyte compared with the commercial pt catalyst on graphitized C.Moreover,the degeneration after 5,000 voltage cycles was negligible.This finding indicates that the presence of strong interaction between pt and topological C defects can not only stabilize pt nanoparticles but also optimize the electronic structures of pt/C catalysts toward ORR.

关键词： O_(2)reduction reaction Pt-based catalysts topological C defects metal-support interactions proton-exchange-membrane fuel cells