skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Electrochemical oxidation of H{sub 2} and CO in a H{sub 2}-H{sub 2}O-CO-CO{sub 2} systems at the interface of a Ni-YSZ cermet electrode and YSZ electrolyte

Abstract

The electrochemical oxidation of H{sub 2} and CO in a H{sub 2}-H{sub 2}O-CO-CO{sub 2} system at the interface of a porous Ni-yttria stabilized zirconia (YSZ) cermet electrode and YSZ electrolyte has been studied using complex-impedance spectroscopy and direct-current polarization measurements of 1,023 and 1,273 K under a constant oxygen partial pressure. The polarization resistance increased when the CO concentration ratio, p{sub CO}[p{sub H{sub 2}} + p{sub CO}], exceeded 0.2 and 0.5 at 1,023 and 1273 K, respectively. The electrochemical oxidation rate of H{sub 2} was 1.9--2.3 times and 2.3--3.1 times higher than that of CO at 1,023 and 1,273 K, respectively, and the water-gas shift reaction was found to be much faster than the electrode reaction at both temperatures. An equivalent-circuit analysis of the complex-impedance spectra suggested that the lower electrochemical oxidation rate of CO (compared to H{sub 2}) was caused mainly by the larger diffusion resistance of CO than H{sub 2} on the electrode surface at 1,023 K, and by both the larger surface diffusion resistance and charge-transfer resistance at 1,273 K.

Authors:
;
Publication Date:
Research Org.:
Tokyo Gas Co., Ltd. (JP)
OSTI Identifier:
20080556
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 03 NATURAL GAS; NATURAL GAS FUEL CELLS; SOLID ELECTROLYTE FUEL CELLS; ELECTROCHEMISTRY; HYDROGEN; CARBON MONOXIDE; OXIDATION; STEAM REFORMER PROCESSES; SHIFT PROCESSES

Citation Formats

Matsuzaki, Yoshio, and Yasuda, Isamu. Electrochemical oxidation of H{sub 2} and CO in a H{sub 2}-H{sub 2}O-CO-CO{sub 2} systems at the interface of a Ni-YSZ cermet electrode and YSZ electrolyte. United States: N. p., 2000. Web. doi:10.1149/1.1393409.
Matsuzaki, Yoshio, & Yasuda, Isamu. Electrochemical oxidation of H{sub 2} and CO in a H{sub 2}-H{sub 2}O-CO-CO{sub 2} systems at the interface of a Ni-YSZ cermet electrode and YSZ electrolyte. United States. doi:10.1149/1.1393409.
Matsuzaki, Yoshio, and Yasuda, Isamu. Mon . "Electrochemical oxidation of H{sub 2} and CO in a H{sub 2}-H{sub 2}O-CO-CO{sub 2} systems at the interface of a Ni-YSZ cermet electrode and YSZ electrolyte". United States. doi:10.1149/1.1393409.
@article{osti_20080556,
title = {Electrochemical oxidation of H{sub 2} and CO in a H{sub 2}-H{sub 2}O-CO-CO{sub 2} systems at the interface of a Ni-YSZ cermet electrode and YSZ electrolyte},
author = {Matsuzaki, Yoshio and Yasuda, Isamu},
abstractNote = {The electrochemical oxidation of H{sub 2} and CO in a H{sub 2}-H{sub 2}O-CO-CO{sub 2} system at the interface of a porous Ni-yttria stabilized zirconia (YSZ) cermet electrode and YSZ electrolyte has been studied using complex-impedance spectroscopy and direct-current polarization measurements of 1,023 and 1,273 K under a constant oxygen partial pressure. The polarization resistance increased when the CO concentration ratio, p{sub CO}[p{sub H{sub 2}} + p{sub CO}], exceeded 0.2 and 0.5 at 1,023 and 1273 K, respectively. The electrochemical oxidation rate of H{sub 2} was 1.9--2.3 times and 2.3--3.1 times higher than that of CO at 1,023 and 1,273 K, respectively, and the water-gas shift reaction was found to be much faster than the electrode reaction at both temperatures. An equivalent-circuit analysis of the complex-impedance spectra suggested that the lower electrochemical oxidation rate of CO (compared to H{sub 2}) was caused mainly by the larger diffusion resistance of CO than H{sub 2} on the electrode surface at 1,023 K, and by both the larger surface diffusion resistance and charge-transfer resistance at 1,273 K.},
doi = {10.1149/1.1393409},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 5,
volume = 147,
place = {United States},
year = {2000},
month = {5}
}