journal article·2023-12-08

Regulating Crystal Phase in Ir-Ge Interstitials for Hydrogen Evolution Electrocatalysis

Zhenyu Li, Lunhuai Sheng, Ruiping Deng, Zexuan Zheng, Peng Hou, Mengxin Chen, Zhuoyuan Ma, Ke Sun, Yuannan Wang, Qiaoyu Liu, Ping Xu, Xuelu Ma, Haibin Chu

ACS Energy Letters· Volume 8· Issue 12
Publisher page

Abstract

The exploration of new catalysts and identification of crucial active sites are of great significance to the field of energy conversion and storage. Here, we report the phase-selective synthesis of three interstitial Ir-Ge electrocatalysts: IrGe, Ir 3 Ge 7, and Ir 4 Ge 5 . The IrGe catalyst possesses the appropriate d–sp orbital hybridization, which activates the Ge site with optimal hydrogen adsorption energy. In situ electrochemical experiments and density functional theory calculations reveal a hydrogen spillover effect by which the H* formed on Ir sites transfers to the Ge sites in IrGe, resulting in activated Ge sites with outstanding catalytic activity. As a result, IrGe exhibits an ultralow overpotential of 12 mV at 10 mA cm –2 for the hydrogen evolution reaction (HER) under acidic conditions, outperforming Pt and other reported Ir-based catalysts. This work not only provides an alternative strategy for the design of new catalysts but also lays a foundation for the identification of catalytic active sites.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Catalytic Processes in Materials Science · Ammonia Synthesis and Nitrogen Reduction

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Chemistry and Chemical Engineering, Inner Mongolia Engineering and Technology Research Center for Catalytic Conversion and Utilization of Carbon Resource Molecules, Inner Mongolia University, Hohhot 010021, China

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

School of Chemical & Environmental Engineering, China University of Mining & Technology, Beijing 100083, China

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China

Department of Chemical Engineering, Columbia University, New York, 10027, United States

Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China

College of Chemistry, Jilin University, Changchun 130012, China

Funding

Inner Mongolia Autonomous Region · Beijing Municipal Natural Science Foundation · National Natural Science Foundation of China · Higher Education Discipline Innovation Project · Fujian Provincial Key Laboratory of Functional Marine Sensing Materials, Minjiang University · Fundamental Research Funds for the Central Universities

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