晶界
催化作用
材料科学
贵金属
电催化剂
纳米颗粒
晶界强化
电化学
金属
化学工程
纳米技术
化学物理
冶金
化学
微观结构
物理化学
电极
生物化学
工程类
作者
Xin Geng,Miquel Vega‐Paredes,Zhenyu Wang,Colin Ophus,Pengfei Lu,Yan Ma,Siyuan Zhang,Christina Scheu,Christian H. Liebscher,Baptiste Gault
标识
DOI:10.1038/s41467-024-52919-w
摘要
Abstract Grain boundaries in noble metal catalysts have been identified as critical sites for enhancing catalytic activity in electrochemical reactions such as the oxygen reduction reaction. However, conventional methods to modify grain boundary density often alter particle size, shape, and morphology, obscuring the specific role of grain boundaries in catalytic performance. This study addresses these challenges by employing gold nanoparticle assemblies to control grain boundary density through the manipulation of nanoparticle collision frequency during synthesis. We demonstrate a direct correlation between increased grain boundary density and enhanced two-electron oxygen reduction reaction activity, achieving a significant improvement in both specific and mass activity. Additionally, the gold nanoparticle assemblies with high grain boundary density exhibit remarkable electrochemical stability, attributed to boron segregation at the grain boundaries, which prevents structural degradation. This work provides a promising strategy for optimizing the activity, selectivity, and stability of noble metal catalysts through precise grain boundary engineering.
科研通智能强力驱动
Strongly Powered by AbleSci AI