Preparation method for ni and mn bimetallic electrocatalyst and its application in small molecule electrooxidation

A preparation method for a Ni and Mn bimetallic electrocatalyst, comprising the following steps:

• (1) cleaning a matrix to remove a surface oxide layer, and obtaining a treated matrix;
• (2) dissolving nickel salt, manganese salt, terephthalic acid, salicylic acid, and urea into a mixed solution and transferring to a high-pressure hydrothermal reaction kettle together with the treated matrix for a hydrothermal reaction, then, obtaining a NiMn-MOF precursor by cooling, cleaning, and drying;
• a molar ratio of the nickel salt to the manganese salt is (0.5:1)-(2:1), and a molar ratio of the terephthalic acid to the nickel salt and the manganese salt is (1:8)-(1:2);
• the mixed solution is a mixture of ethanol, N, N-dimethylformamide, and water;
• and
• (3) dissolving sodium borohydride and selenium powder into deionized water, and stirring continuously for 0.5-2 h in a nitrogen atmosphere to obtain a resulting solution;
• then transferring the resulting solution to the high-pressure hydrothermal reaction kettle, meanwhile adding the NiMn-MOF precursor to carry out a hydrothermal selenization reaction;
• then, obtaining a self-supporting NiMn-MOF-Se catalyst with a uniform nanosheet structure by cooling and cleaning;
• a mass ratio of the sodium borohydride and the selenium powder is (1:1)-(1:4).