Direct Observation of Rate Determining Step for Nd2NiO4+δ SOFC Cathode Reaction by operando Electrochemical XAS

The oxygen chemical potential of dense Nd2NiO4+δ thin films on Zr0.92Y0.08O1.96 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 s...

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Published in:Denki kagaku oyobi kōgyō butsuri kagaku 2014/10/05, Vol.82(10), pp.897-900
Main Authors: ORIKASA, Yuki, INA, Toshiaki, YAMAMOTO, Kentaro, NAKAO, Takayuki, MINESHIGE, Atsushi, AMEZAWA, Koji, KAWADA, Tatsuya, TANIDA, Hajime, URUGA, Tomoya, UCHIMOTO, Yoshiharu
Format: Article
Language:English
Subjects:
Cathode
Cathodes
Chemical potential
Computer simulation
Electric potential
Electrodes
Nd2NiO4
Operando XAS
Partial pressure
Solid Oxide Fuel Cells
Surface reactions
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cited_by cdi_FETCH-LOGICAL-c479t-c1790b32614035cf205150e50c0f7fdff5de70c75b9856627f26074f30680cd13
cites cdi_FETCH-LOGICAL-c479t-c1790b32614035cf205150e50c0f7fdff5de70c75b9856627f26074f30680cd13
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container_issue 10
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container_title Denki kagaku oyobi kōgyō butsuri kagaku
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creator ORIKASA, Yuki
INA, Toshiaki
YAMAMOTO, Kentaro
NAKAO, Takayuki
MINESHIGE, Atsushi
AMEZAWA, Koji
KAWADA, Tatsuya
TANIDA, Hajime
URUGA, Tomoya
UCHIMOTO, Yoshiharu
description The oxygen chemical potential of dense Nd2NiO4+δ thin films on Zr0.92Y0.08O1.96 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.
doi_str_mv 10.5796/electrochemistry.82.897
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source J-STAGE Free
subjects Cathode
Cathodes
Chemical potential
Computer simulation
Electric potential
Electrodes
Nd2NiO4
Operando XAS
Partial pressure
Solid Oxide Fuel Cells
Surface reactions
title Direct Observation of Rate Determining Step for Nd2NiO4+δ SOFC Cathode Reaction by operando Electrochemical XAS
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