| 초록 |
Single atom catalysts (SACs) have attracted scientific attention in various catalytic fields due to their unique catalytic behavior and maximum atom efficiency. With advancement in research on SACs, not only the central metal but also its surrounding coordinative atoms are known to play important roles in determining catalytic activity, selectivity and stability. Herein, we investigated how coordination environment can improve activity and stability of S-coordinated Pt catalyst in electrochemical hydrogen peroxide production. To modulate the coordination environment, various amounts of Pt (1 to 10 wt%) were atomically dispersed on highly S-doped zeolite-templated carbon (HSC) with abundant anchoring sites. According to in-situ XAFS analysis, Pt–S coordination number of Pt/HSCs increased from 2.9 to 4.1 and oxidation state of Pt increased from +1.1 to 2.6 as the Pt loading increased from 1 to 10 wt%. The result showed that the intrinsic activity and Pt stability against leaching was dramatically improved when central Pt atom was coordinated by more S ligands. These results indicate that coordination environment of SACs is a highly critical factor deciding catalytic properties. |
