Designing highly efficient electrocatalysts for the methanol electro-oxidation is an ongoing challenge. Herein, we report that molybdenum carbide (Mo₂C) and cobalt carbide (Co₂C) are grown in situ on the surface of carbon spheres to form Co₂C-Mo₂C@CS carrier material by the impregnation-reduction-annealing process, and then Pt nanoparticles are deposited on the Co₂C-Mo₂C@CS surface through sodium borohydride reduction method. In-depth material characterizations and electrochemical analyses demonstrate that the introduction of small-sized Mo₂C-Co₂C composites can facilitate mass transfer and increase the solid-liquid interface area. As expected, the resulting Pt/Co₂C-Mo₂C@CS catalyst displays excellent methanol oxidation activity (1504.5 mA mg_Pt⁻¹), enhanced CO tolerance and stability comparing with other catalysts, which mainly derived from the metal-support interaction between Co₂C-Mo₂C and small-sized Pt NPs. The rational design of Pt/Co₂C-Mo₂C@CS catalyst provides a feasible strategy for boosting the overall performance of Pt-based catalysts towards methanol oxidation, and broadens the potential applications of metal carbides.

设计用于甲醇电氧化的高效电催化剂是一项持续的挑战。在此，我们报道了碳化钼 (Mo ₂ C) 和碳化钴 (Co ₂ C) 在碳球表面原位生长，通过浸渍-还原-退火形成 Co ₂ C-Mo ₂ C@CS 载体材料工艺，然后通过硼氢化钠还原法将 Pt 纳米颗粒沉积在 Co ₂ C-Mo ₂ C@CS 表面。深入的材料表征和电化学分析表明，小尺寸 Mo ₂ C-Co ₂的引入C复合材料可以促进传质并增加固液界面面积。正如预期的那样，所得的 Pt/Co ₂ C-Mo ₂ C@CS 催化剂表现出优异的甲醇氧化活性（1504.5 mA mg _Pt ^-1），与其他催化剂相比具有更强的 CO 耐受性和稳定性，这主要来自金属-载体相互作用Co ₂ C-Mo ₂ C 和小尺寸 Pt NPs 之间。Pt/Co ₂ C-Mo ₂ C@CS催化剂的合理设计为提高Pt基催化剂对甲醇氧化的整体性能提供了可行的策略，并拓宽了金属碳化物的潜在应用。