Copper-phosphorus/cobalt foam composite catalyst and preparation method thereof

A preparation method for a copper-phosphorus/cobalt foam composite catalyst, comprising:

• S1:
• obtaining cobalt foam and pretreating the cobalt foam;
• S2:
• obtaining a cobalt oxyhydroxide precursor with a double-layer hydroxide structure by performing alkali treatment on pretreated cobalt foam;
• S3:
• obtaining a copper/cobalt foam precursor by preparing a copper-plating electrolyte and subjecting the cobalt oxyhydroxide precursor to electrodeposition in the copper-plating electrolyte;
• wherein the electrodeposition is performed at a constant voltage of −2 to −2.5 V vs. RHE for 100-600 s;
• and
• S4:
• obtaining the copper-phosphorus/cobalt foam composite catalyst by performing phosphating annealing treatment on the copper/cobalt foam precursor;
• wherein the performing phosphating annealing treatment on the copper/cobalt foam precursor includes:
• placing the copper/cobalt foam precursor and sodium hypophosphite powder in a tube furnace, heating to 400° C. at a rate of 1-3° C./min in an argon atmosphere, and holding for 20-30 min;
• wherein the cobalt foam is used as a substrate of the copper-phosphorus/cobalt foam composite catalyst, the substrate is covered with a coating layer including phosphorus nanoparticles and copper nanoparticles, and the phosphorus nanoparticles and the copper nanoparticles are evenly distributed on a surface of the substrate in a lamellar structure formed by nanoparticle accumulation, and a surface of the copper-phosphorus/cobalt foam composite catalyst exhibits an irregular stacked matrix morphology.