Qi Junlei, Yan Yaotian, Liu Tao, Zhou Xin, Cao Jian, Feng Jicai
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.
School of Chemistry and Chemical Engineering, MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology, Harbin 150001, China.
J Colloid Interface Sci. 2020 Apr 1;565:400-404. doi: 10.1016/j.jcis.2020.01.045. Epub 2020 Jan 16.
Herein, porous CoO-CoO heterostructured nanosheets are constructed by plasma treatment. The density-functional theory calculations demonstrate that constructing CoO-CoO heterostructures modify the electronic structure to achieve enhanced electrical conductivity, but also boost the charge transfer to realize enhanced surface reactivity. Contributing to the short ion diffusion path, the rich electroactive surface sites and enhanced charge transfer capability, the resulting CoO-CoO nanosheet arrays possess the low overpotential of 270 mV at 10 mA cm and the low Tafel slope of 49 mV dec. This work provides a novel strategy to construct heterostructured nanosheet arrays by surface reorganization for cost-effective OER electrocatalyst.
在此，通过等离子体处理构建了多孔CoO-CoO异质结构纳米片。密度泛函理论计算表明，构建CoO-CoO异质结构不仅改变了电子结构以提高电导率，还促进了电荷转移以增强表面反应活性。由于离子扩散路径短、富含电活性表面位点以及电荷转移能力增强，所得的CoO-CoO纳米片阵列在10 mA cm时具有270 mV的低过电位和49 mV dec的低塔菲尔斜率。这项工作提供了一种通过表面重组构建异质结构纳米片阵列的新策略，用于制备具有成本效益的析氧反应电催化剂。
