Activation of transition metal oxides by in-situ electro-regulated structure-reconstruction for ultra-efficient oxygen evolution
Activation of transition metal oxides by in-situ electro-regulated structure-reconstruction for ultra-efficient oxygen evolution
复制标题
通过原位电调节结构重建活化过渡金属氧化物以实现超高效析氧
DOI：
10.1016/j.nanoen.2019.01.094
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发表时间：
2019-04-01
期刊：
影响因子：
17.6
通讯作者：
Qiu, Jieshan
中科院分区：
文献类型：
--
作者：
Huang, Huawei;Yu, Chang;Qiu, Jieshan
Cobalt oxides with abundant defects, including those with fully exposed active sites and abundant oxygen vacancies, exhibit superb catalytic activities towards oxygen evolution reaction (OER). Herein, we report a facile in-situ electrochemical self-optimization strategy to produce carbon-fiber-supported defective CoOx (E-CoOx/CF), in which the partial self-dissolution of acidic oxides under alkaline OER operational conditions and releasing of in-situ generated oxygen molecules are taken as advantages for reconstruction of Co species with abundant defects, Co2+ and oxygen vacancies. The resultant E-CoOx/CF can achieve 10 mA cm(-2) at a low overpotential of 249 mV with a remarkable stability (> 100 h without performance decay). Moreover, this electrochemical etching method can also be extended to the preparation of highly active transition metal nickel oxides for enhanced OER. This study represents a new yet efficient strategy for rationally designing and developing advanced transition metal oxides for various electrochemical applications and beyond.
