Tsan Yao Chen
National Tsing Hua University, Taiwan
Title: Atomic scaled surface decoration promises oxygen reduction performance of nanocatalyst
Biography
Biography: Tsan Yao Chen
Abstract
Surface decoration is an effective assessment for improving chemical stability of nanocatalysts. In this study, we demonstrate that the dimension of the surface decoration can be manipulated down to atomic scale. Apart from using noble metals, atomic scaled Pt clusters were employed to improve the oxygen reduction reaction performance of catalysts. Those clusters are decorated in surface defect regions of Cocore-Pdshell (Co-Pd) nanoparticles by using self-aligned nanocrystal growth followed by atomic quench with strong reduction agent. They localize electrons from neighboring atoms and boost activity of Co-Pd NP in ORR. With a proper reaction time and loading control, the Pt cluster decorated Co - Pd nanoparticles enhance its mass activity by 340 times as compared to that of commercial Pt catalysts in an alkaline electrolyte of 1.0M KOH.
Schematic representation for the atomic decoration in core-shell nanoparticle and the corresponding oxygen reduction reaction pathways.