W‐Mo ₁₅ S ₁₉ /Co ₃ O ₄ Composite Catalyst for Methanol Oxidation Reaction in Alkaline Media

Co₃O₄ and W-Mo₁₅S₁₉ were synthesized respectively by solvothermal method, and then W-Mo₁₅S₁₉/Co₃O₄ composite was prepared by ultrasonic-assisted synthesis method. The morphology, structure, and composition of W-Mo₁₅S₁₉/Co₃O₄ composites were investigated by using various characterization techniques such as SEM, XRD, EDS, ICP-OES, and XPS. The electrocatalytic performance of W-Mo₁₅S₁₉/Co₃O₄, Co₃O₄, and W-Mo₁₅S₁₉ for methanol oxidation was analyzed through various electrochemical tests. The experimental results show that W-Mo₁₅S₁₉/Co₃O₄ exhibits good electrocatalytic performance for the methanol oxidation, which is mainly due to the synergistic effect produced by the catalysis property of Co₃O₄ and the excellent electrical conductivity of W-Mo₁₅S₁₉. Compared with Co₃O₄ and W-Mo₁₅S₁₉, W-Mo₁₅S₁₉/Co₃O₄ has a greater current density (23.33 mA cm^-2), a faster reaction kinetics, and maintains a good steady state within 12 h.