Sandwich‐Structured Fe‐Ni<sub>2</sub>P/MoS<i><sub>x</sub></i>/NF Bifunctional Electrocatalyst for Overall Water Splitting
Xinglin Zhang, Chen Liang, Xinyu Qu, Yanfang Ren, Jiajia Yin, Wenjun Wang, Mengsu Yang, Wei Huang, Xiaochen Dong
Abstract
Abstract Exploring cost‐efficient, high‐active bifunctional electrochemical catalysts with long‐term stability are significant for green economy. Herein, a noble‐metal‐free sandwich‐structured catalyst, prepared with facile hydrothermal method and phosphorization process, in which the amorphous MoS x serves as an intermediate layer between the Fe‐doped Ni 2 P and Ni foam substrate (Fe‐Ni 2 P/MoS x /NF) is reported. The obtained free‐standing catalyst performs an enhanced electrochemical activity compared with Fe‐Ni 2 P/NF and MoS x /NF. The Fe‐Ni 2 P/MoS x /NF catalyst only requires overpotentials of 246 mV to achieve 10 mA cm −2 and 277 mV to reach 50 mA cm −2 for oxygen evolution reaction process with a low Tafel slope of 59.7 mV dec −1 in alkaline solution. Meanwhile, an overpotential of 112 mV is demanded to reach 10 mA cm −2 for hydrogen evolution reaction. When the Fe‐Ni 2 P/MoS x /NF is used as two electrodes for overall water splitting, it requires 1.61 V to attain 10 mA cm −2 with prominent durability. This approach provides a versatile strategy to construct excellent bifunctional catalysts for effective water electrolysis.