Improving the electrocatalytic performances of Pt-based catalysts for oxygen reduction reaction via strong interactions with single-CoN4-rich carbon support

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外文摘要：Developing platinum-group-metal(PGM)catalysts possessing strong metal-support interaction and con-trollable PGM size is urgent for the sluggish oxygen reduction reaction(ORR)in proton-exchange mem-brane fuel cells.Herein,we propose an in-situ self-assembled reduction strategy to successfully induce highly-dispersed sub-3nm platinum nanoparticles(Pt NPs)to attach on resin-derived atomic Co coordi-nated by N-doped carbon substrate(Pt/CoSA-N-C)for ORR.To be specific,the interfacial electron inter-action effect,along with a highly robust CoSA-N-C support endow the as-fabricated Pt/CoSA-N-C catalyst with significantly enhanced catalytic properties,i.e.,a mass activity(MA)of 0.719 A/mgPt at 0.9 ViR-free and a reduction of 24.2％in MA after a 20,000-cycles test.Density functional theory(DFT)calculations demonstrate that the enhanced electron interaction between Pt and CoSA-N-C support decreases the d-band center of Pt,which is in favor of lowering the desorption energy of*OH on Pt/CosA-N-C surface and accelerating the formation of H2O,thus enhance the instinct activity of ORR.Furthermore,the higher binding energy between Pt and CoSA-N-C compared to Pt and C indicates that the migration of Pt has been suppressed,which theoretically explains the improved durability of Pt/CoSA-N-C.Our work offers an enlightenment on constructing composite Pt-based catalysts with multiple active sites.

外文关键词：

Fuel cellsOxygen reduction reactionPlatinumSingle-CoN4-rich carbon supportMetal-substrate interaction

作者：

Jin Long、Xingqun Zheng、Bin Wang、Chenzhong Wu、Qingmei Wang、Lishan Peng

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作者单位：

Guizhou University Key Laboratory of Green Chemical and Clean Energy Technology,Guizhou University Engineering Research Center of Efficient Utilization for Industrial Waste,Institute of Dual-carbon and New Energy Technology Innovation and Development of Guizhou Province,School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China

College of Safety Engineering,Chongqing University of Science & Technology,Chongqing 401331,China

Key Laboratory of Rare Earths,Chinese Academy of Sciences,Ganjiang Innovation Academy,Ganzhou 341119,China

基金：

国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Science and Technology Support Project of Guizhou Provincial Science and Technology DepartmentScience and Technology Support Project of Guizhou Provincial Science and Technology DepartmentOpen Project of Institute of Dualcarbon and New Energy Technology Innovation and Development of Guizhou Province中国科学院青年创新促进会项目Selfdeployed Projects of Ganjiang Innovation Academy,CAS

项目编号：

22169005222091862206800922262006ZK[2023]050[2023]403DCRE-2023-062023343E355F006

出版年：

2024

DOI：

10.1016/j.cclet.2023.109354

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

年,卷(期)：2024.35(5)

参考文献量55