▎ 摘　　要

NOVELTY - An antimony doped lactate dehydrogenase/reduced graphene oxide composite material comprises cerium-doped cobalt-based hydrotalcite, reduced graphene oxide, and nanosheet array structure in size of 100 nm. The composite material has two electrocatalytic active sites of cobalt and ruthenium. USE - Antimony doped lactate dehydrogenase/reduced graphene oxide composite material used as catalysts in electrolysis of water for hydrogen evolution (claimed). ADVANTAGE - The conductivity of hydrotalcite on large surface area of the graphene is enhanced. The anchoring effect of hydrotalcite is beneficial to avoid the agglomeration of hydrotalcite, increase the active specific surface area, and expose more active sites. The synergistic action reduces the energy barrier of electrocatalytic reaction, and reduces the electrocatalytic overpotential. Since the doping of ruthenium changes the electronic state of surface of composite, the increased oxygen deficiency helps the adsorption of intermediates at reactive sites, accelerates water electrolysis, and improves hydrogen evolution performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (i) preparation of antimony doped lactate dehydrogenase/reduced graphene oxide composite material which involves ultrasonically dispersing of graphene oxide in an aqueous solution of cobalt nitrate, adding an aqueous solution of ruthenium(III) chloride, ultrasonically dispersing, and adding to an aqueous ammonia solution continuously fed with pure oxygen, stirring at 30-60 degrees C for 12-36 hours, washing and drying to obtain yttrium-doped lactate dehydrogenase/reduced graphene oxide composite; and (ii) application of electrolyzed water hydrogen evolution reaction which involves (1) uniformly mixing lanthanum-doped lactate dehydrogenase/reduced graphene oxide composite material with the conductive agent alkyne black at a mass ratio of 0.2-20, adding with ethanol, ultrasonically treating, adding with Nafion (RTM: sulfonated tetrafluoroethylene based fluoropolymer-copolymer) solution, uniformly mixing and coating on a conductive carbon paper current collector, drying at room temperature to obtain a hydrogen evolution reaction electrode, (2) placing prepared hydrogen evolution reaction electrode in an alkali solution, and using three-electrode system for the reaction. The reference electrode of the three-electrode system is a silver/silver chloride electrode, and the auxiliary electrode is a graphite electrode.