Self-Supported Nickel-Iron Layered Double Hydroxide and Multi-Walled Carbon Nanotube Composite as a Bifunctional Catalyst for Highly Efficient Overall Water Splitting

Due to fossil fuel consumption, the development of green and clean hydrogen energy sources is crucial. In this paper, a composite bifunctional catalyst comprised of Ni–Fe layered double hydroxide and multi-walled carbon nanotubes on nickel foam (LDHCN) were synthesized through a one-step hydrothermal method. The catalyst displayed excellent catalytic activity in both the hydrogen evolution reaction and oxygen evolution reaction. The composition and morphology of LDHCN were determined. Electrochemical testing was performed by building a parallel two-electrode electrolyzer (LDHCN‖LDHCN) that required a voltage of only 1.542[Formula: see text]V to drive 10 mA/cm 2 . LDHCN‖LDHCN also maintained 100[Formula: see text]mA/cm 2 for at least 30 hours, indicating its excellent stability and activity. These results show that the material is viable for the highly efficient conversion and transport of hydrogen energy.