铂金
循环伏安法
伏安法
粒径
分析化学(期刊)
石墨
化学
电解质
材料科学
催化作用
电化学
无机化学
物理化学
电极
有机化学
作者
Cynthia A. Rice,YuYe J. Tong,Eric Oldfield,Andrzej Więckowski
标识
DOI:10.1016/s0013-4686(98)00023-1
摘要
Three graphite-supported commercial fuel cell grade platinum electrocatalysts with different average particle sizes have been studied by cyclic voltammetry and 195Pt nuclear magnetic resonance (NMR) spectroscopy. There is a strong correlation of platinum particle size with both NMR and cyclic voltammetric lineshapes. From cyclic voltammetric profiles it is possible to observe the transformation to a single crystallite geometry as the particle size increases from 2.0 to 8.8 nm. The particle-size-dependent NMR spectra give the first conclusive assignment of the signals from platinum atoms at surfaces wetted by electrolyte, and provide an opportunity for comparison with spectra from equivalent catalysts in the gas phase. We have also found that the application of multiple voltammetric cycles to such platinum particles increases the particle size.
科研通智能强力驱动
Strongly Powered by AbleSci AI