Secondary reduction strategy synthesis of Pt-Co nanoparticle catalysts towards boosting the activity of proton exchange membrane fuel cells
作者机构：State Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijing100029China
出 版 物：《Particuology》 (颗粒学报(英文版))
年 卷 期：2023年第79卷第8期
页 面：18-26页
核心收录：
学科分类：07[理学] 070304[理学-物理化学(含∶化学物理)] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学]
基 金：supported by the National Key Research and Development Program of China(grant No.2022YFB3807500) the National Natural Science Foundation of China(grant No.21922802,22220102003) the Beijing Natural Science Foundation(grant No.JQ19007) “Double-First-Class”construction projects(grant No.XK180301,XK1804-02).
主 题：Ordered Pt3Co nanoparticle Low platinum catalyst Secondary reduction strategy Oxygen reduction reaction Proton exchange membrane fuel cells
摘 要：Based on the volcanic relationship between catalytic activity and key adsorption energies,Pt-Co alloy materials have been widely studied as cathode oxygen reduction reaction(ORR)catalysts in proton exchange membrane fuel cells(PEMFCs)due to their higher active surface area and adjustable D-band energy levels compared to Pt/C.However,how to balance the alloying degree and ORR performance of Pt-Co catalyst remains a great challenge.Herein,we first synthesized a well-dispersed Pt/Co/C precursor by using a mild dimethylamine borane(DMAB)as the reducing agent.The precursor was calcined at high temperature under H_(2)/Ar mixed gas by a secondary reduction strategy to obtain an ordered Pt_(3)Co intermetallic compound nanoparticle catalyst with a high degree of alloying.The optimization of elec-tronic structure due to Pt-Co alloying and the strong metal-carrier interaction ensure the high kinetic activity of the cell membrane electrode.Additionally,the high degree of graphitization increases the electrical conductivity during the reaction.As a result,the activity and stability of the catalyst were significantly improved,with a half-wave potential as high as 0.87 V,which decreased by only 20 mV after 10000 potential cycles.Single-cell tests further validate the high intrinsic activity of the ordered Pt_(3)Co catalyst with mass activity up to 0.67 A mg_(pt)^(-1),exceeding the United States Department of Energy(US DOE)standard(0.44 A mg_(pt)^(-1)),and a rated power of 5.93 W mg_(pt)^(-1).
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