Efficient Water Oxidation Using Nanostructured 伪-Nickel-Hydroxide as an Electrocatalyst
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- 作者：Minrui Gao ; Wenchao Sheng ; Zhongbin Zhuang ; Qianrong Fang ; Shuang Gu ; Jun Jiang ; Yushan Yan
- 刊名：Journal of the American Chemical Society
- 出版年：2014
- 出版时间：May 14, 2014
- 年：2014
- 卷：136
- 期：19
- 页码：7077-7084
- 全文大小：605K
- 年卷期：v.136,no.19(May 14, 2014)
- ISSN：1520-5126
文摘
Electrochemical water splitting is a clean technology that can store the intermittent renewable wind and solar energy in H2 fuels. However, large-scale H2 production is greatly hindered by the sluggish oxygen evolution reaction (OER) kinetics at the anode of a water electrolyzer. Although many OER electrocatalysts have been developed to negotiate this difficult reaction, substantial progresses in the design of cheap, robust, and efficient catalysts are still required and have been considered a huge challenge. Herein, we report the simple synthesis and use of 伪-Ni(OH)2 nanocrystals as a remarkably active and stable OER catalyst in alkaline media. We found the highly nanostructured 伪-Ni(OH)2 catalyst afforded a current density of 10 mA cm鈥? at a small overpotential of a mere 0.331 V and a small Tafel slope of 42 mV/decade, comparing favorably with the state-of-the-art RuO2 catalyst. This 伪-Ni(OH)2 catalyst also presents outstanding durability under harsh OER cycling conditions, and its stability is much better than that of RuO2. Additionally, by comparing the performance of 伪-Ni(OH)2 with two kinds of 尾-Ni(OH)2, all synthesized in the same system, we experimentally demonstrate that 伪-Ni(OH)2 effects more efficient OER catalysis. These results suggest the possibility for the development of effective and robust OER electrocatalysts by using cheap and easily prepared 伪-Ni(OH)2 to replace the expensive commercial catalysts such as RuO2 or IrO2.