期刊
CHEMICAL ENGINEERING JOURNAL
卷 429, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132226
关键词
Cobalt (II) oxide; Hydrogen evolution reaction; Core/shell nanowire arrays; Electrocatalyst; Formation mechanism
资金
- China Postdoctoral Science Foundation [2020 M671713]
This study presents a facile method to fabricate Co@CoO core/shell nanowire arrays as an efficient electrocatalyst for HER. The nanowire arrays exhibit superior catalytic activity with ultra-low overpotential in alkaline solution and excellent long-term stability, making them promising for hydrogen evolution applications.
Exploration of high-efficiency non-noble-metal-based electrocatalysts towards Hydrogen evolution reaction (HER) is critical for water electrolysis. In this work, we adopt a facile hydrothermal deposition plus hydrogen reduction strategy to fabricate self-supported Co@CoO core/shell nanowire arrays as a high-performance electrocatalyst for HER. The Co@CoO nanowire arrays are firmly anchored on the nickel foam substrate, forming an integrated electrode with excellent stability. The formation mechanism of the unique Co@CoO core/shell nanowire arrays is also explored. By virtue of the superior intrinsic catalytic activity of CoO shell and excellent electrical conductivity of Co core, the Co@CoO electrode exhibits significantly promoted catalytic activity for HER with an ultra-low overpotential (76 mV at 10 mA cm(-2)) in alkaline solution, which is superior to almost all the reported CoO-based electrocatalysts. Moreover, the Co@CoO electrode also yields superior long-term durability without any significant performance degradation. DFT calculations further verify the underlying mechanisms. Our proposed optimization strategy sheds light on the development of high activity earth-abundant-metal-based electrocatalyst for hydrogen evolution.
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