纳米片
过电位
共沉淀
析氧
材料科学
钴
化学工程
氢氧化物
纳米技术
电催化剂
电导率
无机化学
化学
电化学
物理化学
电极
工程类
作者
Yuan Wang,Chenxi Yang,Zhimin Li,Zuozhong Liang,Guozhong Cao
出处
期刊:Small
[Wiley]
日期:2020-05-26
卷期号:16 (25)
被引量:21
标识
DOI:10.1002/smll.202001973
摘要
Recently, the curly structure attracts researchers' attention due to the strain effect, electronic effect, and improved surface area, which exhibits enhanced electrocatalytic activity. However, the synthesis of metastable curved structures is very difficult. Herein, a simple room temperature coprecipitation method is proposed to synthesize 3D cobalt (Co) hydroxide (α-Co(OH)2 ) electrocatalysts that consist of curly 2D nanosheets. The formation process of curly nanosheets is elaborated systematically and the results demonstrate that the NHx group has great effect on the formation of curly structure. Combining the advantage of 2D curly nanosheet and 3D aggregate structure, the as-prepared α-Co(OH)2 curly nanosheet aggregates show the best water oxidation activity with an overpotential of 269 mV at j = 10 mA cm-2 in 1.0 m KOH. The electrocatalytic process studies demonstrate that the formation of CoIV O species is the rate-determining step. Theoretical calculations further confirm the beneficial effect of the bent structure on the conductivity, the adsorption of OH- and the formation of OOH* species.
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