journal article·2020-06-19

Interface Catalysts of Ni/Co2N for Hydrogen Electrochemistry

Kaixi Sun, Tong Zhang, Liming Tan, Dexia Zhou, Yuqin Qian, Xiaoxia Gao, Fahui Song, Hongtao Bian, Zhou Lu, Jingshuang Dang, Hong Gao, Jeremy Shaw, Shutang Chen, Gugang Chen, Yi Rao

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Abstract

The development of active, durable, and nonprecious electrocatalysts for hydrogen electrochemistry is highly desirable but challenging. In this work, we design and fabricate a novel interface catalyst of Ni and Co2N (Ni/Co2N) for hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR). The Ni/Co2N interfacial catalysts not only achieve a current density of −10.0 mA cm–2 with an overpotential of 16.2 mV for HER but also provide a HOR current density of 2.35 mA cm–2 at 0.1 V vs reversible hydrogen electrode (RHE). Furthermore, the electrode couple made of the Ni/Co2N interfacial catalysts requires only a cell voltage of 1.57 V to gain a current density of 10 mA cm–2 for overall water splitting. Hybridizations in the three elements of Ni-3d, N-2p, and Co-3d result in charge transfer in the interfacial junction of the Ni and Co2N materials. Our density functional theory calculations show that both the interfacial N and Co sites of Ni/Co2N prefer to hydrogen adsorption in the hydrogen catalytic activities. This study provides a new approach for the construction of multifunctional catalysts for hydrogen electrochemistry.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Electrochemical Analysis and Applications · Fuel Cells and Related Materials

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

Affiliations

Key Laboratory of Pesticide & Chemical Biology Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei 430079, China

Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, United States

Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

University of Chinese Academy of Sciences, Beijing 100049, China

Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China

Anhui Province Key Laboratory of Optoelectronic Material Science and Technology, School of Physics of Electronic Information, Anhui Normal University, Wuhu, Anhui 241002, China

Honda Research Institute, USA, Inc., San Jose, California 95134, United States

Funding

Ministry of Education of the People's Republic of China · National Natural Science Foundation of China · Utah State University · MOE Key Laboratory of Applied Surface and Colloid Chemistry, Shaanxi Normal University

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