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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)897-900
Number of pages4
JournalElectrochemistry
Volume82
Issue number10
DOIs
Publication statusPublished - 2014

Keywords

  • Cathode
  • NdNiO
  • Operando XAS
  • Solid oxide fuel cells

ASJC Scopus subject areas

  • Electrochemistry

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