等离子体刻蚀 Co3O4 纳米片具有丰富的氧空位和高比表面积，用于析氧反应。
Plasma-Engraved Co3 O4 Nanosheets with Oxygen Vacancies and High Surface Area for the Oxygen Evolution Reaction.
机构信息
State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P.R. China.
Department of Macromolecule Science and Engineering, Case Western Reserve University, Ohio, USA.
出版信息
Angew Chem Int Ed Engl. 2016 Apr 18;55(17):5277-81. doi: 10.1002/anie.201600687. Epub 2016 Mar 17.
Co3 O4 , which is of mixed valences Co(2+) and Co(3+) , has been extensively investigated as an efficient electrocatalyst for the oxygen evolution reaction (OER). The proper control of Co(2+) /Co(3+) ratio in Co3 O4 could lead to modifications on its electronic and thus catalytic properties. Herein, we designed an efficient Co3 O4 -based OER electrocatalyst by a plasma-engraving strategy, which not only produced higher surface area, but also generated oxygen vacancies on Co3 O4 surface with more Co(2+) formed. The increased surface area ensures the Co3 O4 has more sites for OER, and generated oxygen vacancies on Co3 O4 surface improve the electronic conductivity and create more active defects for OER. Compared to pristine Co3 O4 , the engraved Co3 O4 exhibits a much higher current density and a lower onset potential. The specific activity of the plasma-engraved Co3 O4 nanosheets (0.055 mA cm(-2) BET at 1.6 V) is 10 times higher than that of pristine Co3 O4 , which is contributed by the surface oxygen vacancies.
Co3 O4 具有混合价态 Co(2+)和 Co(3+)，已被广泛研究作为氧析出反应 (OER) 的高效电催化剂。在 Co3 O4 中适当控制 Co(2+) / Co(3+) 比例可以改变其电子性质，从而改变其催化性能。在此，我们通过等离子体刻蚀策略设计了一种高效的 Co3 O4 基 OER 电催化剂，该策略不仅产生了更高的比表面积，而且在 Co3 O4 表面形成了更多的 Co(2+)，从而产生了氧空位。增加的比表面积确保 Co3 O4 具有更多的 OER 位点，而 Co3 O4 表面的氧空位提高了电导率并为 OER 创造了更多的活性缺陷。与原始 Co3 O4 相比，刻蚀的 Co3 O4 表现出更高的电流密度和更低的起始电位。等离子体刻蚀的 Co3 O4 纳米片的比活性（在 1.6 V 时 BET 为 0.055 mA cm(-2)）比原始 Co3 O4 高 10 倍，这归因于表面氧空位。
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