期刊
ACS CATALYSIS
卷 11, 期 10, 页码 6104-6112出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c01300
关键词
cobalt (oxy)hydroxide; low crystallinity; short-range ordered grains; oxygen vacancy; oxygen evolution reaction
资金
- National Key Research and Development Program [2020YFC1909600]
- Shenzhen Basic Research Project [JCYJ20190808145203535, JCYJ20190808144413257]
- Major Industrial Projects of Shenzhen [s2017001850011]
- Natural Science Foundation of Guangdong Province [2020A1515010380]
In this study, low-crystalline CoOOH nanosheet arrays were prepared on carbon fiber cloth for the oxygen evolution reaction using an electrochemical strategy. The nanosheets had abundant edge sites of CoOOH and oxygen vacancies, leading to improved OER activity compared to high-crystallinity samples. This research presents a new approach for synthesizing defective materials with a short-range ordered structure and contributes to the understanding of OER catalysts.
In this study, low-crystalline CoOOH nanosheet arrays that are grown on carbon fiber cloth (LC-CoOOH NAs/CFC) were prepared using a facile electrochemical strategy for the oxygen evolution reaction (OER). The low-crystalline CoOOH nanosheets were assembled randomly by numerous short-range (1-5 nm) ordered grains with different orientations, inducing abundant grain boundaries (edge sites of CoOOH). Moreover, a certain number of structural defects (oxygen vacancies) were also engineered on the low-crystalline CoOOH nanosheets. Benefiting from these abundant edge sites of CoOOH and oxygen vacancies, LC-CoOOH NAs/CFC exhibit much improved OER activity compared to the high-crystallinity CoOOH NAs/CFC with a perfect structure. This research provides a new way to synthesize the defective materials with a short-range ordered structure and lays a valuable theoretical foundation for the structure and property of OER catalysts.
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