过电位
电化学
甲醇
催化作用
化学
电解质
限制电流
旋转圆盘电极
无机化学
氧气
循环伏安法
硫酸
阴极
电极
物理化学
有机化学
作者
Jean‐François Drillet,Abdel Hady EE,Jochen Friedemann,R. Kötz,B. Schnyder,Volkmar M. Schmidt
标识
DOI:10.1016/s0013-4686(02)00027-0
摘要
The electrochemical oxygen reduction reaction (ORR) was studied at Pt and Pt alloyed with 30 atom% Ni in 1 M H2SO4 and in 1 M H2SO4/0.5 M CH3OH by means of rotating disc electrode. In pure sulphuric acid, the overpotential of ORR at 1 mA cm−2 is about 80 mV lower at Pt70Ni30 than at pure Pt. It was found that in methanol containing electrolyte solution the onset potential for oxygen reduction at PtNi is shifted to more positive potentials and the alloy catalyst has an 11 times higher limiting current density for oxygen reduction than Pt. Thus, PtNi as cathode catalyst should have a higher methanol tolerance for fuel cell applications. On the other hand, no significant differences in the methanol oxidation on both electrodes was found using cycling voltammetry, especially regarding the onset potential for methanol oxidation. During all the measurements no significant electrochemical activity loss was observed at Pt0.7Ni0.3. Ex-situ XPS investigations before and after the electrochemical experiments have revealed Pt enrichment in the first surface layers of the PtNi.
科研通智能强力驱动
Strongly Powered by AbleSci AI