▎ 摘　　要

NOVELTY - Synthesizing metal sulfides comprises (a) synthesizing ammonium tetrathiomolybdate; and (b) synthesizing hydrazinium tetrathiomolybdate using the synthesized ammonium tetrathiomolybdate. USE - The metal sulfides is useful for hydrogen generation reaction electrochemical catalysts. ADVANTAGE - The method improves the performance of a hydrogen generation reaction electrochemical catalyst, electron transfer and electrochemical surface area. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: metal sulfide-based hydrogen generation reaction electrochemical catalyst comprising MoSx-based catalyst or a tungsten disulfide-based catalyst obtained by heat-treating a metal sulfide precursor at a low temperature, where metal sulfide precursor is hydrazinium tetrathiomolybdate or hydrazinium tetrathiotungstate; and preparing electrochemical catalyst based on hydrogen generation reaction comprises (i) synthesizing a metal sulfide precursor of hydrazinium tetrathiomolybdate or hydrazinium tetrathiotungstate, (ii) preparing a MoSx-based hydrogen evolution electrochemical catalyst or a WS2-based hydrogen evolution electrochemical catalyst by heat-treating the metal sulfide precursor.