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Title: Direct Observation of Rate Determining Step for Nd[2]NiO[4+δ] SOFC Cathode Reaction by operando Electrochemical XAS
Authors: ORIKASA, Yuki
INA, Toshiaki
YAMAMOTO, Kentaro  kyouindb  KAKEN_id  orcid (unconfirmed)
NAKAO, Takayuki
KAWADA, Tatsuya
TANIDA, Hajime
URUGA, Tomoya
UCHIMOTO, Yoshiharu  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 折笠, 有基
Keywords: Solid Oxide Fuel Cells
Operando XAS
Issue Date: Oct-2014
Publisher: Electrochemical Society of Japan
Journal title: Electrochemistry
Volume: 82
Issue: 10
Start page: 897
End page: 900
Abstract: The oxygen chemical potential of dense Nd[2]NiO[4+δ] thin films on Zr[0.92]Y[0.08]O[1.96] electrolyte was investigated by operando X-ray absorption spectroscopy (XAS) measurements. Operando XAS at the Ni K-edge was measured under an applied voltage and various oxygen partial pressures at high temperature to simulate the operating conditions of solid oxide fuel cells (SOFCs). The absorption edge energy under various polarizations is similar to those measured under equivalent oxygen partial pressures under open circuit condition. Thus, the oxygen chemical potential changes drastically at the electrode/gas interface and the rate-determining step of this model system is the surface reaction. This study provides direct evidence for the rate-determining step of the SOFC cathode reaction.
Rights: © 2014 The Electrochemical Society of Japan
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.5796/electrochemistry.82.897
Appears in Collections:Journal Articles

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