首页|Sub-10-nm-sized Au@AuxIr1-x metal-core/alloy-shell nanoparticles as highly durable catalysts for acidic water splitting

Sub-10-nm-sized Au@AuxIr1-x metal-core/alloy-shell nanoparticles as highly durable catalysts for acidic water splitting

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The absence of efficient and durable catalysts for oxygen evolution reaction(OER)is the main obstacle to hydrogen production through water splitting in an acidic electrolyte.Here,we report a controllable synthesis method of surface IrOx with changing Au/Ir compositions by constructing a range of sub-10-nm-sized core-shell nanocatalysts composed of an Au core and AuxIr1-x alloy shell.In particular,Au@Au0.43Ir0.57 exhibits 4.5 times higher intrinsic OER activity than that of the commercial Ir/C.Synchrotron X-ray-based spectroscopies,electron microscopy and density functional theory calculations revealed a balanced binding of reaction intermediates with enhanced activity.The water-splitting cell using a load of 0.02 mgIr/cm2 of Au@Au0.43Ir0.57 as both anode and cathode can reach 10 mA/cm2 at 1.52 V and maintain activity for at least 194 h,which is better than the cell using the commercial couple Ir/C ||Pt/C(1.63 V,0.2 h).

controllable synthesis of surface IrOxoxygen evolution reactionacidic water splittingcatalytic stabilitytransition metal catalysts

Huimin Wang、Zhe-ning Chen、Yuanyuan Wang、Dongshuang Wu、Minna Cao、Fanfei Sun、Rong Cao

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State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China

University of Chinese Academy of Sciences,Beijing 100049,China

School of Materials Science and Engineering,Nanyang Technological University,Singapore 639798,Singapore

Shanghai Synchrotron Radiation Facility,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201204,China

Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China

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国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金Fujian Science& Technology Innovation Laboratory for Optoelectronic Information of ChinaMinistry of Education(MOE)Tier 1 SingaporeNAP-SUG from NTU Singapore

2018YFA07045022022YFA150390022033008222201020052021ZZ103RG81/22

2024

10.1093/nsr/nwae056

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ISSN：
年,卷(期)：2024.11(4)
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