MnCo催化石墨化提升载体耐高电位腐蚀性研究
Research on MnCo Co-Catalyzed Graphitized Carbon to Enhance the High-Potential Corrosion Resistance
摘要: 碳载体的石墨化程度是决定质子交换膜燃料电池(PEMFC)催化剂耐久性的核心因素之一。本研究以高比表面碳黑EC300J为基底，探究Mn、Co金属及其组合对其低温催化石墨化效果、结构稳定性及载体抗高电位氧化腐蚀能力的影响。结果表明，Mn-Co双金属共催化石墨化效果最佳，所得碳载体(MnCo-EC300J-G)的拉曼光谱ID/IG比值低至0.9085，显著优于单一金属催化样品。三电极体系中的高电位循环伏安加速老化测试(10,000圈)显示，MnCo-EC300J-G在0.6 V附近的氧化峰电流密度仅增加35.4%，远低于Co-EC300J-G (47.7%)、Mn-EC300J-G (50.3%)及未处理EC300J (66.1%)。进一步将上述载体负载Pt纳米颗粒并组装膜电极进行耐久测试，经10,000圈高电位加速老化后，Pt/MnCo-EC300J-G在0.6 V附近的氧化峰电流密度仅增加21.2%，低于Pt/EC300J的32.1%。综上，Mn-Co双金属催化石墨化策略能显著提升碳载体的抗高电位氧化腐蚀能力，为高耐久燃料电池催化材料的设计提供了可行路径。
Abstract: The graphitization degree of carbon support critically governs the durability of proton exchange membrane fuel cell (PEMFC). In this work, high-surface-area carbon black (EC300J) was applied as the substrate to systematically evaluate the effects of Mn, Co, and their bimetallic combination on low-temperature catalytic graphitization, structural stability, and corrosion resistance under high-potential oxidative conditions. The results demonstrate that Mn-Co bimetallic catalysis yields the highest graphitization efficiency, affording a carbon support (MnCo-EC300J-G) with a remarkably low Raman ID/IG ratio of 0.9085, substantially outperforming the single-metal counterparts. Accelerated aging tests via high-potential cyclic voltammetry (10,000 cycles) in a three-electrode setup show that the oxidation peak current density of MnCo-EC300J-G near 0.6 V increases by merely 35.4%, in contrast to 47.7%, 50.3%, and 66.1% for Co-EC300J-G, Mn-EC300J-G, and pristine EC300J, respectively. When these supports were loaded with Pt nanoparticles and assembled into membrane electrode assemblies for extended durability evaluation, the Pt/MnCo-EC300J-G electrode exhibited only a 21.2% increase in oxidation peak current density after 10,000 high-potential cycles, significantly lower than Pt/EC300J (32.1%). Collectively, the Mn-Co bimetallic catalytic graphitization strategy markedly boosts the oxidative corrosion resistance of carbon supports, offering a promising route toward durable catalytic layer materials for PEMFC applications.
文章引用：吴爱明, 朱凤鹃. MnCo催化石墨化提升载体耐高电位腐蚀性研究[J]. 材料科学, 2026, 16(8): 73-85. https://doi.org/10.12677/ms.2026.168176

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