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 FeOOHÀ 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 FeOOHÀ 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 highperformance heterostructure electrocatalysts for energy conversion.

In situ assembly of Ni3S2 nanosheets encapsulated with NiFe(oxy)hydroxides for efficient water oxidation

“…The peak at 168.41 eV belongs to SO 4 2− generated by the oxidation on the Ni 3 S 2 surface. 31–33 It is notable that the peaks of element S were not detected in the XPS of NiFe(OH) x /Ni 3 S 2 (Fig. S8, ESI†), confirming again that the Ni 3 S 2 is limited to the inner core by contrast with the XRD results.…”