| 초록 |
In catalyst development, one of the biggest scientific challenges is to improve both selectivity and activity all at once. For example, the Pd-Au system is a candidate that has been attracting attention as catalysts of direct H2O2 synthesis with better performances than monometallic Pd catalysts. In particular, the incorporation of Au into Pd lattices shows a superior H2O2 selectivity (~98%). But, as the content of Au is continuously increased on the surface, the active Pd site gradually disappears. Inevitably, the H2 conversion capability on the bimetallic catalyst is reduced, thereby lowering H2O2 productivity. Thus, enhancing both the catalytic activity and selectivity all at once remains a scientific challenge so far. In this study, we employ the nonconcentric Pd-Au Nanoparticles (NPs) composed of three type surfaces of Pd, Au-rich domains, and Pd-Au interfaces which benefit selective H2O2 synthesis. As expected, nonconcentric Pd-Au NPs have very high H2O2 selectivity and productivity in comparison to Pd, Pd@Au core@shell, and PdAu alloy. |
