Methanol crossover is one of the largest problems in direct methanol fuel cells (DMFCs). Methanol passing from the anode to the cathode through the membrane is oxidized at the cathode, degrading the DMFC performance, and the intermediates of the methanol oxidation reaction (MOR) cause cathode catalyst poisoning. Therefore, it is essential to develop a cathode catalyst capable of inhibiting MOR while promoting the oxygen reduction reaction (ORR), which is a typical cathode reaction in DMFCs. In this study, a carbon-encapsulated Pt cathode catalyst was synthesized for this purpose. The catalyst was simply synthesized by heat treatment of Pt–aniline complex-coated carbon nanofibers. The carbon shell of the catalyst was effective in inhibiting methanol from accessing the Pt core, and this effect became more prominent as the graphitization degree of the carbon shell increased. Meanwhile, the carbon shell allowed O₂ to permeate regardless of the graphitization degree, enabling the Pt core to participate in ORR. The synthesized catalyst showed higher performance and stability in single-cell tests under various conditions compared to commercial Pt/C.

中文翻译：

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直接甲醇燃料电池的耐甲醇Pt-C核壳型阴极催化剂。

甲醇交换是直接甲醇燃料电池（DMFC）中最大的问题之一。通过膜从阳极到阴极的甲醇在阴极被氧化，从而降低DMFC的性能，甲醇氧化反应（MOR）的中间体会导致阴极催化剂中毒。因此，重要的是开发一种能够抑制MOR同时促进氧还原反应（ORR）的阴极催化剂，该反应是DMFC中典型的阴极反应。在这项研究中，为此目的合成了碳包封的Pt阴极催化剂。该催化剂是通过对Pt-苯胺复合物包覆的碳纳米纤维进行热处理而简单合成的。催化剂的碳壳可有效抑制甲醇进入Pt核，随着碳壳石墨化程度的提高，这种效果更加突出。同时，碳壳允许O₂不受石墨化程度的影响而渗透，从而使Pt核参与ORR。与市售Pt / C相比，合成的催化剂在各种条件下的单电池测试中显示出更高的性能和稳定性。