Preparation method and application of Pt-doped CoNi LDH nanocage material

The invention discloses a preparation method and application of a Pt-doped CoNi LDH nanocage material, and the preparation method comprises the following steps: dissolving cobalt acetate and polyvinylpyrrolidone in an ethanol solvent, carrying out a heating reflux reaction, and then separating, washing and drying to obtain Co-MOC; the preparation method comprises the following steps: dispersing a Co-MOC precursor in an ethanol solvent to obtain a Co-MOC precursor dispersion liquid, dissolving nickel nitrate in the ethanol solvent to obtain a nickel nitrate solution, adding the nickel nitrate solution into the Co-MOC precursor dispersion liquid, and carrying out oil bath heating, separation, washing and drying to obtain a CoNi LDH nanocage; dispersing the CoNi LDH nanocage in an ethanol solvent, dropwise adding a chloroplatinic acid solution into the solution, stirring at room temperature, separating, washing and drying to obtain the Pt-doped CoNi LDH nanocage. According to the CoNi LDH nanocage synthesized in