ACS Appl Mater Interfaces. 2018 Jul 25;10(29):24523-24532. doi: 10.1021/acsami.8b06485. Epub 2018 Jul 16.
In this study, a facile approach has been successfully applied to synthesize a hierarchical three-dimensional architecture of ultrasmall hematite nanoparticles homogeneously encapsulated in MoS/nitrogen-doped graphene nanosheets, as a novel non-Pt cathodic catalyst for oxygen reduction reaction in fuel cell applications. The intrinsic topological characteristics along with unique physicochemical properties allowed this catalyst to facilitate oxygen adsorption and sped up the reduction kinetics through fast heterogeneous decomposition of oxygen to final products. As a result, the catalyst exhibited outstanding catalytic performance with a high electron-transfer number of 3.91-3.96, which was comparable to that of the Pt/C product. Furthermore, its working stability with a retention of 96.1% after 30 000 s and excellent alcohol tolerance were found to be significantly better than those for the Pt/C product. This hybrid can be considered as a highly potential non-Pt catalyst for practical oxygen reduction reaction application in requirement of low cost, facile production, high catalytic behavior, and excellent stability.
在这项研究中，成功应用了一种简便的方法来合成一种均匀封装在 MoS/氮掺杂石墨烯纳米片中的超小针铁矿纳米粒子的分级三维结构，作为一种新型的非 Pt 阴极催化剂，用于燃料电池中的氧还原反应。这种催化剂具有内在的拓扑特性和独特的物理化学性质，能够促进氧气的吸附，并通过快速的异质分解氧气来加速还原动力学，最终生成产物。结果表明，该催化剂表现出优异的催化性能，电子转移数高达 3.91-3.96，可与 Pt/C 产品相媲美。此外，该催化剂在 30000 s 后保持了 96.1%的工作稳定性，并且具有良好的耐醇性，明显优于 Pt/C 产品。这种复合材料可被视为一种具有高潜力的非 Pt 催化剂，适用于需要低成本、简便生产、高催化性能和优异稳定性的实际氧还原反应应用。
