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Nano Research

Article Title

An electrodeposition approach to metal/metal oxide heterostructures for active hydrogen evolution catalysts in near-neutral electrolytes

Authors

Michael J. Kenney, Department of Chemistry, Stanford University, Stanford, CA 94305, USA
Jianan Erick Huang, Department of Chemistry, Stanford University, Stanford, CA 94305, USA
Yong Zhu, School of Physical Sciences and CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China
Yongtao Meng, Department of Chemistry, Stanford University, Stanford, CA 94305, USA College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Mingquan Xu, School of Physical Sciences and CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China
Guanzhou Zhu, Department of Chemistry, Stanford University, Stanford, CA 94305, USA
Wei-Hsuan Hung, Department of Chemistry, Stanford University, Stanford, CA 94305, USA Department of Materials Science and Engineering, Feng Chia University, Taichung 40724, Taiwan, China
Yun Kuang, Department of Chemistry, Stanford University, Stanford, CA 94305, USA State Key laboratory of Chemical Resource Engineering and Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Mengchang Lin, College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Xiaoming Sun, State Key laboratory of Chemical Resource Engineering and Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Wu Zhou, School of Physical Sciences and CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China
Hongjie Dai, Department of Chemistry, Stanford University, Stanford, CA 94305, USA

Keywords

water splitting, catalysis, nanostructured materials, hydrogen evolution, chemical mapping

Abstract

Neutral water splitting is attractive for its use of non-corrosive and environmentally friendly electrolytes. However, catalyst development for hydrogen and oxygen evolution remains a challenge under neutral conditions. Here we report a simple electrodeposition and reductive annealing procedure to produce a highly active Ni-Co-Cr metal/metal oxide heterostructured catalyst directly on Ni foam. The resulting electrocatalyst for hydrogen evolution reaction (HER) requires only 198 mV of overpotential to reach 100 mA/cm2 in 1 M potassium phosphate (pH = 7.4) and can operate for at least two days without significant performance decay. Scanning transmission electron microscopy coupled with electron energy loss spectroscopy (STEM-EELS) imaging reveals a Ni-Co alloy core decorated with blended oxides layers of NiO, CoO and Cr2O3. The metal/metal oxide interfaces are suggested to be responsible for the high HER activity.

Graphical Abstract

Publisher

Tsinghua University Press

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