Engineering NiS/Ni2P Heterostructures for Efficient Electrocatalytic Water Splitting

Xiao, Xin, Huang, Dekang, Fu, Yong Qing, Wen, Ming, Jiang, Xingxing, Lv, Xiaowei, Li, Man, Gao, Lin, Liu, Shuangshuang, Wang, Mingkui, Zhao, Chuan and Shen, Yan (2018) Engineering NiS/Ni2P Heterostructures for Efficient Electrocatalytic Water Splitting. ACS Applied Materials & Interfaces, 10 (5). pp. 4689-4696. ISSN 1944-8244

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Abstract

Developing high-active and low-cost bifunctional materials for catalyzing hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) holds pivotal role in water splitting. Therefore, we present a new strategy to form NiS/Ni2P heterostructures. The as-obtained NiS/Ni2P/CC requires overpotentials of 111 mV for the HER and 265 mV for the OER to reach a current density of 20 mA cm-2, outperforming their counterparts such as NiS and Ni2P under the same conditions. Additionally, the NiS/Ni2P/CC electrode requires a 1.67 V cell voltage to deliver 10 mA cm-2 in two-electrode electrolysis system, which is comparable to the cell using the benchmark Pt/C||RuO2 electrode. Detailed characterizations reveal that strong electronic interactions between NiS and Ni2P, abundant active sites, and smaller charge transfer resistance contribute to the improved HER and OER activity.

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