The development of efficient and stable catalysts is the key to promote the application of fuel cells. The modified carbon support can improve the performance of platinum -based catalyst by improving the Pt dispersion. The effect of surface oxygen content and pore structure on modified carbon support are studied to explain their respective role in Pt dispersion. With three designed pretreatment routes, it is found that surface oxygen content on carbon black negatively correlates with the Pt dispersion, while newly-generated 2–4 nm mesopores play a positive role. The modified CBs with low surface oxygen content and more 2–4 nm mesopores can drive Pt nanoparticles to reach smaller diameters and narrower diameter regions. The catalysts supported by the CBs modified in solid-phase at 700 °C have best performance (336 mA mg, 14 % degradation after 30k cycles). In the membrane electrode assembly , the maximum power density of MEA-Pt/CB-S-700 is 0.907W/cm, which is higher than that of MEA-Pt/C (0.875 W/cm). After accelerated degradation test , it also shows good durability. This optimization method of carbon support can effectively improve the performance of catalysts, which provides an effective way for the practical application of catalysts in fuel cell.

中文翻译：

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通过具有低表面氧含量和更多介孔的改性碳载体改善Pt分散和催化性能

开发高效稳定的催化剂是推动燃料电池应用的关键。改性碳载体可以通过改善Pt分散度来提高铂基催化剂的性能。研究了表面氧含量和孔隙结构对改性碳载体的影响，以解释它们各自在 Pt 分散中的作用。通过设计三种预处理路线，发现炭黑表面氧含量与 Pt 分散度呈负相关，而新生成的 2-4 nm 介孔则起正相关。具有低表面氧含量和更多2-4 nm介孔的改性CB可以驱动Pt纳米颗粒达到更小的直径和更窄的直径区域。 700℃固相改性CBs负载的催化剂具有最佳性能（336 mA mg，30k循环后降解14%）。在膜电极组件中，MEA-Pt/CB-S-700的最大功率密度为0.907W/cm，高于MEA-Pt/C（0.875 W/cm）。经过加速降解测试，也表现出良好的耐久性。这种碳载体的优化方法可以有效提高催化剂的性能，为催化剂在燃料电池中的实际应用提供了有效途径。