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

Abstract 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 Ni 3 S 2 , and the FeOOH−Ni 3 S 2 shows remarkable electrocatalytic performance for OER and HER compared to the pristine Ni 3 S 2 sample. Currently, we use a quick chemical immersion method to synthesize FeOOH on the surface of Ni 3 S 2 nanosheets to form a FeOOH−Ni 3 S 2 heterostructure. The FeOOH was formed as the dissolution process of Ni 3 S 2 in Fe(NO 3 ) 3 solution. Our work opens up a quick, facile, and effective way to synthesize FeOOH and design high‐performance heterostructure electrocatalysts for energy conversion.