高温退火提升质子交换膜燃料电池阴极催化剂的铂利用率  

High-temperature annealing improves Pt utilization of proton exchange membrane fuel cell cathode catalysts

作　　者：李俊杰 李子睿 李帅 徐聪 李昂 童磊 梁海伟 Junjie Li;Zirui Li;Shuai Li;Cong Xu;Ang Li;Lei Tong;Haiwei Liang(Hefei National Research Center for Physical Sciences at the Microscale,Department of Chemistry,University of Science and Technology of China,Hefei 230026,China;Nano Science and Technology Institute,University of Science and Technology of China,Suzhou 215123,China)

机构地区：[1]Hefei National Research Center for Physical Sciences at the Microscale,Department of Chemistry,University of Science and Technology of China,Hefei 230026,China [2]Nano Science and Technology Institute,University of Science and Technology of China,Suzhou 215123,China

出　　处：《Science China Materials》2024年第6期1851-1857,共7页中国科学（材料科学）（英文版）

基　　金：the funding support from the National Natural Science Foundation of China (22325903,22221003,and 22071225);the National Key Research and Development Program of China (2018YFA0702001);the Plan for Anhui Major Provincial Science&Technology Project (202203a0520013 and 2021d05050006);the USTC Research Funds of the Double First-Class Initiative (YD2060002032)。

摘　　要：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.High-temperature annealing is widely re-cognized as an effective way to improve the durability of Pt/C cathode catalysts used in proton exchange membrane fuel cells(PEMFCs),yet systematic studies on its effects on PEMFC performance are still lacking.Herein,we explore the effect of high-temperature annealing on the PEMFC performance,based on a thorough comparative analysis of Pt/C catalysts annealed at temperatures ranging from 500-900℃.Our re-sults reveal that high-temperature annealing not only en-hances the catalyst durability but also substantially increases Pt utilization,which in turn drives the increase in mass ac-tivity and the enhancement of low-current-density perfor-mance.Based on an array of electrochemical and physical characterization results,we infer that the increased utilization of Pt might stem from nanoparticle migration induced by high-temperature annealing,leading to closer proximity be-tween Pt nanoparticles and ionomers.This reduced distance potentially enhances the accessibility of protons to the Pt na-noparticles,thereby improving the Pt utilization.

关 键 词：Pt/C catalyst fuel cell oxygen reduction reaction Pt utilization high-temperature annealing 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TQ426[化学工程]