Wang Jianying, Teng Xue, Niu Yanli, Guo Lixia, Kong Jianfei, He Xiaoming, Chen Zuofeng
Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University Shanghai 200092 China
Jiangsu Vocational College of Medicine Yancheng 224005 Jiangsu Province China.
RSC Adv. 2019 Jul 12;9(38):21679-21684. doi: 10.1039/c9ra04368c. eCollection 2019 Jul 11.
A highly efficient and low-cost oxygen evolution reaction electrocatalyst is essential for water splitting. Herein, a simple and cost-effective autologous growth method is developed to prepare NiFe-based integrated electrodes for water oxidation. In this method, a Ni(OH) nanosheet film is first developed on nickel foam by oxidative deposition in a chemical bath solution. The as-prepared nanosheet electrode is then immersed into a solution containing Fe(iii) cations to form an Fe-doped Ni(OH) electrode by utilization of the different solubility of metal cations. Benefiting from its unique and integrated nanostructure, this hierarchically structured electrode displays extremely high catalytic activity toward water oxidation. In 1 M KOH, the electrode can deliver a current density of 1000 mA cm at an overpotential of only 330 mV. This work provides a facile way to produce an efficient, durable, and Earth-abundant OER electrocatalyst with no energy input, which is attractive for large-scale water splitting.
一种高效且低成本的析氧反应电催化剂对于水分解至关重要。在此，开发了一种简单且经济高效的自生长方法来制备用于水氧化的镍铁基集成电极。在该方法中，首先通过在化学浴溶液中进行氧化沉积在泡沫镍上制备出氢氧化镍纳米片薄膜。然后将所制备的纳米片电极浸入含有铁（III）阳离子的溶液中，利用金属阳离子不同的溶解度形成铁掺杂的氢氧化镍电极。受益于其独特的集成纳米结构，这种分级结构电极对水氧化表现出极高的催化活性。在1 M氢氧化钾溶液中，该电极在仅330 mV的过电位下可提供1000 mA/cm²的电流密度。这项工作提供了一种无需能量输入就能制备高效、耐用且储量丰富的析氧反应电催化剂的简便方法，这对于大规模水分解具有吸引力。
