College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China.
Nanoscale. 2017 Aug 31;9(34):12343-12347. doi: 10.1039/c7nr04344a.
Developing nanoporous nanoarray electrocatalysts for efficient water oxidation in environmentally benign media is highly desired but still remains a key challenge. In this communication, we report the fabrication of a nanoporous crystalline CoBO nanowire array on Ti mesh (CoBO/TM) from a Co(OH)F nanowire array on Ti mesh (Co(OH)F/TM) via an anion-exchange reaction. As a three dimensional (3D) catalyst electrode for water oxidation, CoBO/TM exhibits superior catalytic activity and needs an overpotential of only 446 mV to drive a geometrical catalytic current density of 10 mA cm in 0.1 M potassium borate (pH = 9.2). Notably, this catalyst also shows strong long-term electrochemical durability with high turnover frequency values of 0.19 and 0.81 mol O per s at overpotentials of 400 and 500 mV, respectively.
在环境友好的介质中开发用于高效水氧化的纳米多孔纳米阵列电催化剂是人们非常期望的，但仍然是一个关键挑战。在本通讯中，我们报告了一种纳米多孔结晶 CoBO 纳米线阵列在 Ti 网上的制备（CoBO/TM），该纳米线阵列是通过阴离子交换反应从 Ti 网上的 Co(OH)F 纳米线阵列（Co(OH)F/TM）制备得到的。作为水氧化的三维（3D）催化剂电极，CoBO/TM 表现出优异的催化活性，仅需 446 mV 的过电势即可在 0.1 M 硼酸钾（pH = 9.2）中驱动 10 mA cm 的几何催化电流密度。值得注意的是，该催化剂还表现出很强的长期电化学耐久性，在 400 mV 和 500 mV 的过电势下，其周转率频率值分别高达 0.19 和 0.81 mol O per s。
