Cui Liang, Qu Fengli, Liu Jingquan, Du Gu, Asiri Abdullah M, Sun Xuping
College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, P. R. China.
College of Chemical and Environmental Engineering, Qingdao University, Qingdao, 266071, Shandong, P. R. China.
ChemSusChem. 2017 Apr 10;10(7):1370-1374. doi: 10.1002/cssc.201700113. Epub 2017 Mar 9.
Developing earth-abundant electrocatalysts for efficient and stable water oxidation under near neutral conditions is of great importance but still remains a key challenge. Herein, we demonstrate the development of an interconnected network of core-shell CoP@CoBiPi through anodic polarization of a CoP nanoarray in potassium borate aqueous electrolyte (KBi). This 3 D CoP@CoBiPi exhibits high catalytic activity for water oxidation at pH 9.2 and needs an overpotential (η) of only 410 mV to drive a geometrical catalytic current density of 10 mA cm , with a high turnover frequency of 819 h at an overpotential of 610 mV. Remarkably, this catalyst also demonstrates high long-term electrochemical stability with its activity being maintained for at least 27 h in KBi. This study provides us an attractive earth-abundant 3 D catalyst electrode for water-splitting devices toward efficient and stable water oxidation under benign conditions.
开发在近中性条件下用于高效稳定水氧化的地球丰富型电催化剂具有重要意义，但仍是一项关键挑战。在此，我们展示了通过在硼酸钾水溶液（KBi）中对CoP纳米阵列进行阳极极化来制备核壳结构CoP@CoBiPi的互连网络。这种三维CoP@CoBiPi在pH 9.2时对水氧化表现出高催化活性，驱动几何催化电流密度为10 mA cm只需410 mV的过电位（η），在610 mV过电位下具有819 h的高周转频率。值得注意的是，这种催化剂还表现出高的长期电化学稳定性，其活性在KBi中至少保持27 h。这项研究为我们提供了一种有吸引力的地球丰富型三维催化剂电极，用于水分解装置在温和条件下实现高效稳定的水氧化。
