| 초록 |
Single atom catalysts (SACs) have been actively studied. SACs produce maximum utilization of noble metal and unique catalytic properties due to absence of ensemble site. For examples, Pt1/TiN and Pt1/TiC showed high selectivity to H2O2 during oxygen reduction reaction, Pd1/Cu(111) single atom alloy has unusual selectivity for hydrogenation reactions. However, SACs are unstable due to high surface free energy but can be stabilized by support or ligand. Sb-doped SnO2 (ATO) has strong metal-support interaction with Pt, high conductivity, and corrosion resistance. DFAFCs has attracted as next-generation power sources and FAOR occurs at anode. FAOR has ‘dual-path mechanism’. Direct path needs only 1-2 Pt atoms but indirect path needs Pt ensemble. High selectivity to direct path is needed because indirect path has CO intermediate, which is known for catalytic poison. In this research, Pt single atom alloy supported on ATO showed high selectivity to direct path and high stability. |
