Surface decoration prompting the decontamination of active sites in high-temperature proton exchange membrane fuel cells  

作　　者：Jiaqi Lin Pupu Yang Yimin Jiang Shiqian Du Dongcai Zhang Gen Huang Jinbo Wang Jun Wang Qie Liu Miaoyu Li Yujie Wu Peng Long Yangyang Zhou Li Tao Shuangyin Wang 

机构地区：[1]Research Institute of Hunan University in Chongqing,Chongqing 401120,China [2]College of Chemistry and Chemical Engineering,Jiangxi Science and Technology Normal University,Nanchang 330013,China [3]KBC Hydrogen Energy Technology Co.,Ltd.,Yiyang 413100,China

出　　处：《Chinese Chemical Letters》2024年第11期549-553,共5页中国化学快报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2021YFA1500900);the National Natural Science Foundation of China(Nos.22102053,21825201,22172047 and U19A2017);the Provincial Natural Science Foundation of Hunan(Nos.2019GK2031,2016TP1009,2020JJ5045 and 2021JJ30089);the Science and Technology Innovation Program of Hunan Province,China(Nos.2020RC2020,2022RC1036);Shenzhen Science and Technology Program(No.JCYJ20210324122209025);Basic and Applied Basic Research Foundation of Guangdong Province-Regional joint fund project(No.2021B1515120024);Natural Science Foundation of Chongqing(No.cstc2021jcyj-msxmX0770);the Science Funds of the Education Office of Jiangxi Province(No.GJJ2201324);the Science Funds of Jiangxi Province(No.20224BAB213018);the China Postdoctoral Science Foundation(Certificate No.2023M741121)。

摘　　要：In electrochemical energy devices,the operating conditions always exert enormous influence on electrocatalysts'performances.Phosphoric acid(PA),acted as the proton carriers,can be adsorbed on Pt surface,block active sites and affect the electronic structure of Pt unfavorably,which severely restricts the performance of high-temperature proton exchange membrane fuel cells(HT-PEMFCs).Herein,simply basic organic compounds,such as dicyandiamide(DCD),melamine(Mel)and cyanuric acid(CA),are decorated on Pt surface(DCD-Pt/C,Mel-Pt/C and CA-Pt/C)to induce the adsorption transfer of proton carriers.The decoration can not only inject electrons to Pt and enhance oxygen reduction reaction(ORR)activity but also can induce PA to transfer from Pt surface to organic compounds,decontaminating active sites.In addition,the organic compounds with the larger conjugated system and the smaller electronegativity of ligating atoms would have a greater interaction with Pt,causing a larger decoration amount on Pt surface,which leads to more excellent ORR activity and resistance to PA blockage effect.Therefore,MelPt/C shows a peak power density of 629 mW/cm^(2),exceeding commercial Pt/C(437 mW/cm^(2)),DCD-Pt/C(539 m W/cm^(2))and CA-Pt/C(511 mW/cm^(2))with the same loading.

关 键 词：High-temperature proton exchange membrane fuel cells Decontamination of active sites Oxygen reduction reaction Surface decoration Adsorption transfer 

分 类 号：TM911.4[电气工程—电力电子与电力传动]