Porous Ni-Mo-S Nanowire Network Film Electrode as a High-Efficiency Bifunctional Electrocatalyst for Overall Water Splitting
Porous Ni-Mo-S Nanowire Network Film Electrode as a High-Efficiency Bifunctional Electrocatalyst for Overall Water Splitting
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DOI：
10.1002/celc.201700965
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发表时间：
2018-01-01
期刊：
影响因子：
4
通讯作者：
Wang, Xiaoguang
中科院分区：
文献类型：
--
作者：
Ma, Zizai;Meng, Huijie;Wang, Xiaoguang
开发具有优异的析氢反应（HER）和析氧反应（OER）活性和稳定性的无贵金属电催化剂对于促进电催化分解水生成H-2至关重要。在泡沫镍上电镀镍-钼，然后硫化，制备了一种新型的三维自支撑Ni-Mo-S纳米线网络膜电极，作为HER和OER的双功能催化剂。电化学测试结果表明，Ni-Mo-S电极具有极高的催化活性和耐久性，在碱性介质中，该电极的电催化电流密度为100 mAcm（-2），HER过电位为290 mV，OER过电位为390 mV。结合其上级和稳健的OER催化活性，通过采用Ni-Mo-S与Ni-Mo-S并行进行全面水分解，构建了在2.0V电池电压下可达到100 mAcm（-2）的碱性电解槽，从而表明了一种均匀、具有成本效益且地球资源丰富的材料体系，可用于高效生产H2。
Developing noble-metal-free electrocatalysts with excellent activity and stability for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is essential for promoting the generation of H-2 by electrocatalytic water splitting. Herein, a novel 3D self-supported Ni-Mo-S nanowire network film electrode was prepared by facile electroplating nickel-molybdenum on nickel foam followed by sulfurization as bifunctional catalysts for both HER and OER. Electrochemical measurements reveal that superb high catalytic activity and durability is acquired on the Ni-Mo-S electrode, which can afford an electrocatalytic current density of 100mAcm(-2) with an overpotential of 290mV for the HER and an overpotential of 390mV for the OER in alkaline medium. Coupled with the superior and robust OER catalytic activity, an alkaline electrolyzer that can achieve 100mAcm(-2) at a cell voltage of 2.0V was constructed by applying Ni-Mo-S parallel to Ni-Mo-S for overall water splitting, thus indicating a homogeneous, cost-effective, and earth-abundant material system for highly efficient H-2 production.