Nanoscale nickel oxide/nickel heterostructures for active hydrogen evolution electrocatalysis

Ming Gong, Wu Zhou, Mon-Che Tsai, Jigang Zhou, Mingyun Guan, Meng-Chang Lin, Bo Zhang, Yongfeng Hu, Di-Yan Wang, Jiang Yang, Stephen J. Pennycook, Bing-Joe Hwang and Hongjie Dai ()
Additional contact information
Ming Gong: Stanford University
Wu Zhou: Oak Ridge National Laboratory
Mon-Che Tsai: National Taiwan University of Science and Technology
Jigang Zhou: Canadian Light Source Inc.
Mingyun Guan: Stanford University
Meng-Chang Lin: Stanford University
Bo Zhang: Stanford University
Yongfeng Hu: Canadian Light Source Inc.
Di-Yan Wang: Stanford University
Jiang Yang: Stanford University
Stephen J. Pennycook: The University of Tennessee
Bing-Joe Hwang: National Taiwan University of Science and Technology
Hongjie Dai: Stanford University

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Active, stable and cost-effective electrocatalysts are a key to water splitting for hydrogen production through electrolysis or photoelectrochemistry. Here we report nanoscale nickel oxide/nickel heterostructures formed on carbon nanotube sidewalls as highly effective electrocatalysts for hydrogen evolution reaction with activity similar to platinum. Partially reduced nickel interfaced with nickel oxide results from thermal decomposition of nickel hydroxide precursors bonded to carbon nanotube sidewalls. The metal ion–carbon nanotube interactions impede complete reduction and Ostwald ripening of nickel species into the less hydrogen evolution reaction active pure nickel phase. A water electrolyzer that achieves ~20 mA cm−2 at a voltage of 1.5 V, and which may be operated by a single-cell alkaline battery, is fabricated using cheap, non-precious metal-based electrocatalysts.

Date: 2014
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DOI: 10.1038/ncomms5695

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