Measuring individual overpotentials in an operating solid-oxide electrochemical cell

被引：44

作者：

El Gabaly, Farid ^{[1
]}

Grass, Michael ^{[2
]}

McDaniel, Anthony H. ^{[1
]}

Farrow, Roger L. ^{[1
]}

Linne, Mark A. ^{[1
]}

Hussain, Zahid ^{[2
]}

Bluhm, Hendrik ^{[3
]}

Liu, Zhi ^{[2
]}

McCarty, Kevin F. ^{[1
]}

机构：

[1] Sandia Natl Labs, Livermore, CA 94550 USA

[2] Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[3] Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2010年 / 12卷 / 38期

关键词：

RAY PHOTOELECTRON-SPECTROSCOPY; FUEL-CELLS; X-RAY; ELECTRON-SPECTROSCOPY; CATALYTIC-ACTIVITY; OXYGEN REDUCTION; HYDROGEN; FILMS; OXIDATION; BINDING;

D O I：

10.1039/c003581e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We use photo-electrons as a non-contact probe to measure local electrical potentials in a solid-oxide electrochemical cell. We characterize the cell in operando at near-ambient pressure using spatially-resolved X-ray photoemission spectroscopy. The overpotentials at the interfaces between the Ni and Pt electrodes and the yttria-stabilized zirconia (YSZ) electrolyte are directly measured. The method is validated using electrochemical impedance spectroscopy. Using the overpotentials, which characterize the cell's inefficiencies, we compare without ambiguity the electro-catalytic efficiencies of Ni and Pt, finding that on Ni H(2)O splitting proceeds more rapidly than H(2) oxidation, while on Pt, H(2) oxidation proceeds more rapidly than H(2)O splitting.

引用

页码：12138 / 12145

页数：8

共 44 条

[1] Factors governing oxygen reduction in solid oxide fuel cell cathodes [J].