Material design with the concept of solid solution-type defect engineering in realizing the conversion of an electrocatalyst of NiS2 into a photocatalyst for hydrogen evolution

[Display omitted] •The incorporation of In and O into NiS2 to form solid solution in (Ni,In)(O,S)2-x.•The conversion of a low-bandgap electrocatalyst into a high-bandgap photocatalyst.•First report on (Ni,In)(O,S)2-x with different amounts of oxygen vacancies.•Surface oxygen vacancy defect and the N...

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