Abstract

Mesostructured silicates MCM-48, SBA-15, and MCM-41 were synthesized, and the corresponding ordered mesoporous carbons CMK-1, CMK-3, and CS41 were prepared on their basis. Disordered mesoporous carbon WMC was prepared on the basis of amorphous SiO₂. The carbon materials obtained were taken as supports for Pt electrocatalysts, which were tested in a model reaction of oxygen reduction. The supports and catalysts were examined by methods of low-temperature nitrogen adsorption, thermal gravimetric analysis, X-ray diffraction, and high-resolution transmission electron microscopy. The catalyst supported on CMK-1 ordered carbon material exhibits higher activity compared to the catalysts supported on CMK-3, CS41, and WMC. The results obtained show that the morphology of carbon support pores plays an important role in the electrocatalytic activity of Pt particles and that the correct choice of carbon supports can ensure considerable cost reduction due to decreased metal content of the catalyst.

中文翻译：

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介孔碳的形态对Pt在氧还原反应中电催化活性的影响

摘要

合成了介孔结构的硅酸盐MCM-48，SBA-15和MCM-41，并在其基础上制备了相应的有序介孔碳CMK-1，CMK-3和CS41。基于无定形SiO ₂制备了无序介孔碳WMC。将获得的碳材料用作Pt电催化剂的载体，并在氧还原的模型反应中对其进行了测试。通过低温氮吸附，热重分析，X射线衍射和高分辨率透射电子显微镜的方法检查载体和催化剂。与负载在CMK-3，CS41和WMC上的催化剂相比，负载在CMK-1有序碳材料上的催化剂表现出更高的活性。所获得的结果表明，碳载体孔的形态在Pt颗粒的电催化活性中起着重要作用，并且由于催化剂金属含量的降低，正确选择碳载体可以确保显着降低成本。