The stability of a carbon support is especially essential for oxygen reduction reaction (ORR) electrocatalysts in fuel cells. The state‐of‐the‐art support, generally active carbons, usually have poor corrosion resistance and weak interaction with noble metals, leading to degradation of electrocatalyst performance. Herein, a composite electrocatalyst support denoted CeO₂/MWNT, combining high corrosion resistance and strong interaction with platinum, was fabricated through ceria deposited on multiwall carbon nanotubes (MWNTs). On the one hand, high electronic conductivity, medium surface area, and abandoned surface functional groups of MWNTs guarantee fine dispersion and performance of platinum. On the other hand, high corrosion resistive MWNTs and strong interactions between platinum and CeO₂ prevent the platinum from degrading. The durability of the electrocatalyst and support are evaluated, referring to the NREL standard. After accelerated testing, the mean particle size of Pt‐CeO₂/MWNT increases from 3.1 to 3.5 nm, whereas the loss of electrochemical surface area and specific activity are 14.7 and 9.2 %, respectively, which are much lower than those of commercial Pt/C, which uses activated carbon as the support.

中文翻译：

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CeO2修饰的多壁碳纳米管支持的耐用铂基电催化剂

碳载体的稳定性对于燃料电池中的氧还原反应（ORR）电催化剂特别重要。最先进的载体（通常为活性炭）通常具有较差的耐腐蚀性和与贵金属的弱相互作用，从而导致电催化剂性能下降。在此，通过沉积在多壁碳纳米管（MWNTs）上的二氧化铈制备了具有高耐腐蚀性和与铂的强相互作用的表示为CeO ₂ / MWNT的复合电催化剂载体。一方面，MWNT的高电子电导率，中等表面积和废弃的表面官能团可确保铂的精细分散和性能。另一方面，高耐腐蚀性的MWNT和铂与CeO ₂之间的强相互作用防止铂降解。参照NREL标准评估电催化剂和载体的耐久性。经过加速测试后，Pt-CeO ₂ / MWNT的平均粒径从3.1纳米增加到3.5纳米，而电化学表面积和比活性的损失分别为14.7％和9.2％，远低于商业Pt / C，它使用活性炭作为载体。