Electroreduction of oxygen on gold-supported nanostructured palladium films in acid solutions

被引：49

作者：

Sarapuu, Ave ^{[1
]}

Kasikov, Aarne ^{[2
]}

Wong, Naomi ^{[3
]}

Lucas, Chris A. ^{[3
]}

Sedghi, Gita ^{[4
]}

Nichols, Richard J. ^{[4
]}

Tammeveski, Kaido ^{[1
]}

机构：

[1] Univ Tartu, Inst Chem, EE-50411 Tartu, Estonia

[2] Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia

[3] Univ Liverpool, Dept Phys, Liverpool L69 7ZD, Merseyside, England

[4] Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England

来源：

ELECTROCHIMICA ACTA | 2010年 / 55卷 / 22期

基金：

英国工程与自然科学研究理事会;

关键词：

Oxygen reduction; Electrocatalysis; Gold support; Palladium film; Scanning tunnelling microscopy; CO-AU ELECTROCATALYSTS; ELECTROCHEMICAL REDUCTION; ALLOY ELECTROCATALYSTS; PD ELECTROCATALYST; O-2; REDUCTION; THIN-FILM; NANOPARTICLES; KINETICS; CARBON; ELECTRODES;

D O I：

10.1016/j.electacta.2010.05.092

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electrochemical reduction of oxygen on thin Pd films with a nominal thickness of 0.25-10 nm on polycrystalline Au substrate (Pd/Au) was studied. The Pd films were prepared by electron beam evaporation and oxygen reduction was studied in 0.1 M HClO4 and 0.05 M H2SO4 solutions using the rotating disk electrode (ROE) method. The surface morphology of Pd overlayers was examined by scanning tunnelling microscopy (STM). O-2 reduction predominantly proceeds through 4e(-) pathway on all Pd/Au electrodes. The specific activity (SA) of oxygen reduction was lower in H2SO4 solution and decreased slightly with decreasing the Pd film thickness. In HClO4, the SA was higher and not significantly dependent on the film thickness. The Tafel slope values close to -60 mV at low current densities and -120 mV at high current densities were found for all electrodes. (c) 2010 Elsevier Ltd. All rights reserved.

引用

页码：6768 / 6774

页数：7

共 50 条

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