State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
Central Theater Command General Hospital of the Chinese People's Liberation Army, Wuhan 430070, China.
Dalton Trans. 2019 Sep 21;48(35):13466-13471. doi: 10.1039/c9dt02841b. Epub 2019 Aug 27.
Phosphorization engineering is an alternative method to explore highly efficient electrocatalysts for water splitting. Herein, a heterostructure consisting of NiP and NiS supported on commercial nickel foam (NiS-NiP/NF) was prepared through the conversion of some NiS molecules into NiP by phosphorization engineering. Electrochemical tests revealed that the partial phosphorization of NiS effectively enhanced the catalytic activity of the host electrocatalyst towards the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in 1 M KOH; in particular, the NiS-NiP/NF electrode exhibited the current density of 50 mA cm at the very low OER overpotential of 287 mV and needed the low overpotential of 130 mV to afford 10 mA cm for the HER. Moreover, the alkaline electrolyzer assembled by two NiS-NiP/NF electrodes could deliver 10 mA cm at the low voltage of 1.58 V and exhibited excellent durability during electrolysis for 15 h. Therefore, our study opens up an attractive fabrication strategy for highly active heterostructure electrocatalysts.
磷化工程是探索高效水分解电催化剂的一种替代方法。在此，通过磷化工程将部分 NiS 分子转化为 NiP，制备了由负载在商业镍泡沫上的 NiP 和 NiS 组成的异质结构（NiS-NiP/NF）。电化学测试表明，NiS 的部分磷化有效地增强了主体电催化剂对 1 M KOH 中析氧反应（OER）和析氢反应（HER）的催化活性；特别是，NiS-NiP/NF 电极在非常低的 287 mV 过电势下表现出 50 mA cm 的电流密度，并且需要 130 mV 的低过电势来提供 10 mA cm 的 HER。此外，由两个 NiS-NiP/NF 电极组装的碱性电解槽可以在低电压 1.58 V 下提供 10 mA cm 的电流，并且在 15 小时的电解过程中表现出优异的耐久性。因此，我们的研究为高活性异质结构电催化剂的制备开辟了一条有吸引力的策略。
