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.
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).
作者简介
Hsiwen Wu,contributed equally to this work;Fei Xiao,contributed equally to this work;Address correspondence to:Meng Gu,gum@sustech.edu.cn;Address correspondence to:Minhua Shao,kemshao@ust.hk。
