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Science China Materials 2024年第6期67卷 1851-1857页

作者：李俊杰李子睿李帅徐聪李昂童磊梁海伟 Hefei National Research Center for Physical Sciences at the Microscale Department of ChemistryUniversity of Science and Technology of ChinaHefei 230026China Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123China

高温退火被认为是提升质子交换膜燃料电池中铂碳阴极催化剂耐久性的有效方法,但关于其对燃料电池性能的影响尚缺乏研究报道.本文通过对不同温度制备的铂碳催化剂进行详细对比分析,探讨了高温退火对燃料电池性能的影响.结果表明,高温退... 详细信息

高温退火被认为是提升质子交换膜燃料电池中铂碳阴极催化剂耐久性的有效方法,但关于其对燃料电池性能的影响尚缺乏研究报道.本文通过对不同温度制备的铂碳催化剂进行详细对比分析,探讨了高温退火对燃料电池性能的影响.结果表明,高温退火不仅增强了催化剂的耐久性,还显著提升了铂的利用率,进而提高了其质量活性和低电流密度性能.基于一系列电化学和物理表征结果,我们推测铂利用率的提升源于高温退火导致的铂纳米颗粒迁移行为,进而缩短了铂纳米颗粒与离子聚的间距.而较短的间距有利于提高质子对铂纳米颗粒的可及性,最终实现了铂纳米颗粒利用率的提升.

关键词： pt/C catalyst fuel cell oxygen reduction reaction pt utilization high-temperature annealing

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The effect of catalyst layer design on catalyst utilization in PEMFC studied via stochastic reconstruction method

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Energy and AI 2023年第3期13卷 64-75页

作者： Congfan Zhao Shu Yuan Xiaojing Cheng Zhifeng Zheng Jia Liu Jiewei Yin Shuiyun Shen Xiaohui Yan Junliang Zhang Institute of Fuel Cells School of Mechanical EngineeringShanghai Jiao Tong University800 Dongchuan RoadShanghai 200240PR China MOE Key Laboratory of Power Machinery and Engineering Shanghai Jiao Tong University800 Dongchuan RoadShanghaiPR China Shanghai Hydrogen Propulsion Technology Co. Ltd1788 Xiechun RdShanghai 201804PR China

Catalyst utilization is an important determinant of proton exchange membrane fuel cell performance,and increasing the catalyst utilization is one of the most critical approaches to reducing the catalyst loading in PEMFC.4-phase stochastic reconstruction method based on the variable-resolution Quartet Structure Generation Set(QSGS)algorithm is utilized to elucidate the influence of different parameters of electrode preparation,including the porosity,the dispersion degree of carbon agglomerate,ionomer content,and carbon support size,on the catalyst utilization in the catalyst *** was found that there exist optimal values for the porosity,dispersion degree of carbon agglomerate,ionomer content,and carbon support sizes in CLs and any deviations from these optimal values would lead to transport issues of electron,proton and mass within *** electron,proton and mass transport into consideration simultaneously,the optimal pt utilization is 46.55%among 48 cases in this investigation,taken at the carbon support diameter of 40 nm,the porosity of 0.4,the agglomerate spatial density of 25μm^(−3) and I/C at *** selection of porosity,ultrasonic dispersion technique and ionomer content for conventional electrode preparation requires compromises on mass,electron and proton transport,leading to catalyst utilization in CLs hardly exceeding 50%.Therefore,the next generation of catalyst layer design and preparation technology is desired.

关键词： PEMFC Catalyst layer pt utilization Reconstruction method Triple phase boundary

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pt/Mo2C heteronanosheets for superior hydrogen evolution reaction

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Journal of Energy Chemistry 2020年第8期29卷 317-323,I0011页

作者： Zhao Liu Jing Li Shiji Xue Shunfa Zhou Konggang Qu Ying Li Weiwei Cai Sustainable Energy Laboratory Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage&Novel Cell Technology Liaocheng UniversityLiaocheng 252059ShandongChina Research Institute for New Materials Technology Chongqing University of Arts and SciencesChongqing 402160China Zhejiang Institute China University of GeosciencesHangzhou 311305ZhejiangChina

One of the most primary challenges to achieve large-scale hydrogen generation from water electrolysis is the sluggish kinetics and noble metal dependence of cathodic hydrogen evolution reaction(HER).By considering the excellent water dissociation catalytic activity of Mo2C, abundant pt/Mo2C interfaces were facilely engineered via galvanic replacement(gr) by using Mo/Mo2C nanosheets as self-sacrificed templates to alter the alkaline HER mechanism on pt based catalyst. The rational designed interface-rich gr-pt/Mo2C catalyst exhibited excellent activity with the overpotential to drive 10 mA/cm2 current density decreased by 18.5 mV compared with the commercial pt/C catalyst. 34.3 mV/dec Tafel slope confirms the Volmer-Tafel HER route on gr-pt/Mo2C in alkaline condition. Platinum utilization is calculated to be improved by 9.7 times by considered the low pt loading in the gr-pt/Mo2C catalyst. With its satisfied stability, the scalable gr-pt/Mo2C catalyst shows promising application potential in industrial electrolysis systems.

关键词： Hydrogen evolution reaction Heteronanosheet Galvanic replacement pt/Mo2C interface pt utilization

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