Wang Muheng, Wu Yun, Li Na, Zhao Fei, Zhao Qiang, Li Jinping, Liu Guang
Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, P. R. China.
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
Chem Asian J. 2020 May 4;15(9):1484-1492. doi: 10.1002/asia.202000213. Epub 2020 Apr 9.
Electrochemical water splitting is an ideal pollution-free path to generate hydrogen at large scale, however, the development of highly catalytic electrocatalysts for the water oxidation reaction at large current densities is still a fundamental challenge. Herein, we report a novel, high-wettability water-oxidation electrocatalyst composed of an amorphous NiFe layer and CoS film on commercial nickel foam via a two-step electrodeposition synthetic path. Benefiting from the strong interactions between the NiFe layer and CoS film, enlarged surface active sites and enhanced wettability, the CoS@NiFe/NF electrode exhibited an outstanding water oxidation performance at 10 mA/cm with an overpotential of 175 mV in 1 M KOH solution and steadily delivered a current density of 1 A/cm at merely 330 mV in 30 wt% KOH solution. Even at large densities, the CoS@NiFe/NF hybrids also showed excellent water oxidation stability and corrosion resistance for at least 24 h. Such a synergistic assembling approach to fabricate a CoS@NiFe/NF heterostructure together with excellent OER performance may be a promising strategy for rationally building and designing heterostructural electrocatalysts towards highly efficient water oxidation reaction.
电化学水分解是大规模制氢的理想无污染途径，然而，开发用于大电流密度下水氧化反应的高催化活性电催化剂仍然是一个根本性挑战。在此，我们报道了一种通过两步电沉积合成路径在商用泡沫镍上由非晶态NiFe层和CoS膜组成的新型高润湿性水氧化电催化剂。得益于NiFe层与CoS膜之间的强相互作用、扩大的表面活性位点以及增强的润湿性，CoS@NiFe/NF电极在1 M KOH溶液中，在10 mA/cm²电流密度下表现出优异的水氧化性能，过电位为175 mV，并且在30 wt% KOH溶液中仅需330 mV就能稳定提供1 A/cm²的电流密度。即使在大电流密度下，CoS@NiFe/NF复合材料在至少24小时内也表现出优异的水氧化稳定性和耐腐蚀性。这种协同组装方法制备CoS@NiFe/NF异质结构以及优异的析氧反应性能，可能是合理构建和设计用于高效水氧化反应的异质结构电催化剂的一种有前景的策略。
