Facile Synthesis of FeOOH−Ni₃S₂ Nanosheet Arrays on Nickel Foam via Chemical Immersion toward Electrocatalytic Water Splitting

Electrocatalytic water splitting is a useful and promising strategy to produce hydrogen, which is a sustainable and pollution-free supply in the future. Herein, we design the FeOOH as an improved part to enhance the excellent water splitting catalytic activities of the Ni₃S₂, and the FeOOH−Ni₃S₂ shows remarkable electrocatalytic performance for OER and HER compared to the pristine Ni₃S₂ sample. Currently, we use a quick chemical immersion method to synthesize FeOOH on the surface of Ni₃S₂ nanosheets to form a FeOOH−Ni₃S₂ heterostructure. The FeOOH was formed as the dissolution process of Ni₃S₂ in Fe(NO₃)₃ solution. Our work opens up a quick, facile, and effective way to synthesize FeOOH and design high-performance heterostructure electrocatalysts for energy conversion.