Highly active and durable core-shell electrocatalysts for proton exchange membrane fuel cells  

作　　者：Hsiwen Wu Fei Xiao Jing Wang Meng Gu Minhua Shao 

机构地区：[1]Department of Chemical and Biological Engineering,The Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong,China [2]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [3]Fok Ying Tung Research Institute,The Hong Kong University of Science and Technology,Guangzhou 511458,China [4]Energy Institute and Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution,The Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong,China

出　　处：《Nano Research》2024年第10期8772-8784,共13页纳米研究（英文版）

基　　金：supported by the National Key R&D Program of China(No.2020YFB1505800);the Guangzhou Key Research and Development Program(No.202103040002);the Green Tech Fund(No.GTF202020092);the National Key R&D Program of China(No.2022YFA1503900);the Guangdong Scientific Program(No.2019QN01L057).

摘　　要：This work presents simple post-treatment methods to selectively and partially remove the Pd core of Pd-Pt core–shell(Pt@Pd/C)catalysts.The proton exchange membrane fuel cell with the post-treated Pt@Pd/C cathode(Pt loading:0.10 mg·cm^(-2))delivers an impressive peak power density of 1.2 W·cm^(-2).The partial removal of Pd core endows an ultrahigh oxygen reduction reaction(ORR)mass activity of 0.32 A·g_(PGM)-1 when normalized to the platinum group metal(PGM)mass,or equivalently 0.55 A·mg_(Pt)^(-1) at 0.9 V measured in a fuel cell.The post-treatment thickens the Pt shells and mitigates the Pd dissolution during potential cycling.As a result,the post-treated core-shell catalyst demonstrates superior durability in ORR mass activity and polarization power density retention than untreated core-shell catalyst and benchmark Pt/C.In-situ inductively coupled plasmamass spectrometry(ICP-MS)results highlight that the amount of dissolved Pd in post-treated core–shell catalyst is 17-times lower than that of the untreated one.Our findings highlight the importance of structural tuning of catalysts in enhancing their mass activity and durability.

关 键 词：core-shell catalyst platinum monolayer proton exchange membrane fuel cell oxygen reduction reaction DURABILITY 

分 类 号：O64[理学—物理化学]