| 초록 |
Maximum atom efficiency as well as distinct chemoselectivity is expected for electrocatalysis on atomically dispersed metal species, however its realization was difficult because the most widely used electrocatalyst support, carbon, cannot stabilize them due to the lack of strong metal-support interactions. Here we report that a sulfur-doped zeolite-templated carbon, simultaneously exhibiting extra-large sulfur content (17 wt% S) and unique carbon structure (i.e., highly curved 3-dimensional networks of graphene nanoribbons) can stabilize relatively high loading of Pt (5 wt%) in the form of atomically dispersed Pt species. In oxygen reduction reaction, the catalyst did not follow the general 4-electron pathway producing H2O, but selectively produced H2O2 via a 2-electron pathway. Besides, the catalyst was also inactive in the consecutive H2O2 decomposition reactions, which makes the catalyst potentially promising for the production of an important fine chemical, H2O2, while generating electricity in commercialized fuel cell systems. |
