OXYGEN REDUCTION ON SMALL SUPPORTED PLATINUM PARTICLES .2. CHARACTERIZATION BY X-RAY ABSORPTION-SPECTROSCOPY

被引：28

作者：

WEBER, RS ^{[1
]}

PEUCKERT, M ^{[1
]}

DALLABETTA, RA ^{[1
]}

BOUDART, M ^{[1
]}

机构：

[1] STANFORD UNIV, DEPT CHEM ENGN, STANFORD, CA 94305 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1988年 / 135卷 / 10期

关键词：

Carbon--Surfaces - Catalysts--Materials - Electrochemistry - Platinum and Alloys;

D O I：

10.1149/1.2095371

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

X-ray absorption spectra at the PtLIII edge were obtained during the electrochemical reduction of O2 for an electrocatalyst containing 1 nm clusters of Pt on carbon. Changes in the threshold peak area and edge position in the spectra suggest that the oxidation state of the metal decreases linearly with the applied potential in the range from 1010 to 900 mV (NHE), much like the behavior of bulk Pt electrodes. However, the overall oxidation state of the clusters is consistent with a surface stoichiometry nearer PtO0.5 rather than PtO proposed for the surface of bulk electrodes.

引用

页码：2535 / 2538

页数：4

共 35 条

[21] DETERMINATION OF D-BAND OCCUPANCY IN PURE METALS AND SUPPORTED CATALYSTS BY MEASUREMENT OF L3 X-RAY ABSORPTION THRESHOLD [J].