▎ 摘　　要

NOVELTY - Palladium/nickel-silicate nanotube/graphene hydrogen evolution catalyst, comprises graphene as a conductive carrier, nickel-silicate nanotube (Ni-SNT) as a limited-range silicate nanotube medium, and palladium nanoparticles are active metals, in which palladium nanoparticles are filled in the Ni-SNT tube wall; preferably, based on the catalyst, the content of palladium nanoparticles is 2-10 wt.%. USE - The catalyst is useful for producing hydrogen by electrolyzing water (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the catalyst, comprising (i) dissolving soluble nickel salt in deionized water, adding excess of ammonia solution drop by drop to make the solution form a precipitate first, gradually dissolving the precipitate under magnetic stirring, adding 0.1-0.5 mol/l sodium silicate solution drop by drop to form precipitation, in which the molar ratio of nickel to silicon is 0.05-0.4; adding polyvinylpyrrolidone, stirring for 0.5-3 hours, transferring the resulting mixture into a polytetrafluoroethylene-lined hydrothermal reaction kettle, reacting at 150-220 degrees C for 8-48 hours, naturally cooling to room temperature, centrifuging, washing with deionized water and ethanol many times, drying at 150-200 degrees C, calcining at 350-500 degrees C to obtain Ni-SNT; (ii) dispersing obtained Ni-SNT in ethanol, adding 0.1-0.4 M palladium chloride solution, in which the molar ratio of palladium to nickel is 1:5-5:1; ultrasonicating for 1-3 hours, so that palladium chloride is fully filled in Ni-SNT, adding 1-10 g/l graphene oxide dispersion to the wall of silicate nanotubes, continuing ultrasonication for 0.5-2 hours, and transferring the resulting mixture into a polytetrafluoroethylene-lined hydrothermal reactor, reacting at 100-180 degrees C for 2-8 hours, naturally cooling to room temperature, centrifuging, washing with deionized water and ethanol many times, and drying at 150-200 degrees C.