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We report water-splitting application of chemically stable self-grown nickel sulfide (Ni  x  S  y  ) electrocatalysts of different nanostructures including rods, flakes, buds, petals, etc., synthesized by a hydrothermal method on a three-dimensional Ni foam (NiF) in the presence of different sulfur-ion precursors, e.g., thioacetamide, sodium thiosulfate, thiourea, and sodium sulfide. The S 2- ions are produced after decomposition from respective sulfur precursors, which, in general, react with oxidized Ni 2+ ions from the NiF at optimized temperatures and pressures, forming the Ni  x  S  y  superstructures. These Ni  x  S  y  electrocatalysts are initially screened for their structure, morphology, phase purity, porosity, and binding energy by means of various sophisticated instrumentation technologies. The as-obtained Ni  x  S  y  electrocatalyst from sodium thiosulfate endows an overpotential of 200 mV. The oxygen evolution overpotential results of Ni  x  S  y  electrocatalysts are comparable or superior to those reported previously for other self-grown Ni  x  S  y  superstructure morphologies.

acs omega

Electrocatalytic Water Splitting through the NixSy Self-Grown Superstructures Obtained via a Wet Chemical Sulfurization Process