Hierarchical Rhree-dimensional CoNi LDH-Ni3S2 Supported on Ni Foam as a Stable and Efficient Electrocatalytic Material for Overall Water Splitting

Herein, a novel self-supporting three-dimensional nanostructured CoNi LDH-Ni3S2 catalyst was generated in a two-step process combining hydrothermal synthesis and high-temperature electrodeposition techniques. The CoNi LDH-Ni3S2/NF electrode exhibits superior electrocatalytic performance with low overpotentials of 193 and 382 mV in 1 M KOH to drive a high current density of 100 mA cm(-2) for HER and OER, respectively. Meanwhile, a small cell voltage of 1.51 V was obtained upon using CoNi LDH-Ni3S2/NF as a dual-functional catalyst. Additionally, CoNi LDH-Ni3S2/NF exhibits high stability with almost no change in HER and OER overpotentials and electrocatalytic total decomposition of water within 80,000 s.