Direct observation of rate determining step for Nd2NiO4+δ SOFC cathode reaction by operando electrochemical XAS

Yuki Orikasa; Toshiaki Ina; Kentaro Yamamoto; Takayuki Nakao; Atsushi Mineshige; Koji Amezawa; Tatsuya Kawada; Hajime Tanida; Tomoya Uruga; Yoshiharu Uchimoto

doi:10.5796/electrochemistry.82.897

Direct observation of rate determining step for Nd₂NiO_4+δ SOFC cathode reaction by operando electrochemical XAS

Yuki Orikasa, Toshiaki Ina, Kentaro Yamamoto, Takayuki Nakao, Atsushi Mineshige, Koji Amezawa, Tatsuya Kawada, Hajime Tanida, Tomoya Uruga, Yoshiharu Uchimoto

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The oxygen chemical potential of dense Nd₂NiO_4+δ thin films on Zr_0.92Y_0.08O_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.

Original language	English
Pages (from-to)	897-900
Number of pages	4
Journal	Electrochemistry
Volume	82
Issue number	10
DOIs	https://doi.org/10.5796/electrochemistry.82.897
Publication status	Published - 2014

Keywords

Cathode
NdNiO
Operando XAS
Solid oxide fuel cells

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10.5796/electrochemistry.82.897

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@article{57d055ffa91e4f538513fc778371d6fa,

title = "Direct observation of rate determining step for Nd2NiO4+δ SOFC cathode reaction by operando electrochemical XAS",

abstract = "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.",

keywords = "Cathode, NdNiO, Operando XAS, Solid oxide fuel cells",

author = "Yuki Orikasa and Toshiaki Ina and Kentaro Yamamoto and Takayuki Nakao and Atsushi Mineshige and Koji Amezawa and Tatsuya Kawada and Hajime Tanida and Tomoya Uruga and Yoshiharu Uchimoto",

note = "Publisher Copyright: {\textcopyright} 2014 The Electrochemical Society of Japan.",

year = "2014",

doi = "10.5796/electrochemistry.82.897",

language = "English",

volume = "82",

pages = "897--900",

journal = "Electrochemistry",

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publisher = "Electrochemical Society of Japan",

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TY - JOUR

T1 - Direct observation of rate determining step for Nd2NiO4+δ SOFC cathode reaction by operando electrochemical XAS

AU - Orikasa, Yuki

AU - Ina, Toshiaki

AU - Yamamoto, Kentaro

AU - Nakao, Takayuki

AU - Mineshige, Atsushi

AU - Amezawa, Koji

AU - Kawada, Tatsuya

AU - Tanida, Hajime

AU - Uruga, Tomoya

AU - Uchimoto, Yoshiharu

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - Cathode

KW - NdNiO

KW - Operando XAS

KW - Solid oxide fuel cells

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JO - Electrochemistry

JF - Electrochemistry

IS - 10

ER -

Direct observation of rate determining step for Nd₂NiO_4+δ SOFC cathode reaction by operando electrochemical XAS

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Keywords

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