Reversible structural transformation and redox properties of Cr-loaded iron oxide dendrites studied by: In situ XANES spectroscopy

Hirosuke Matsui, Nozomu Ishiguro, Youya Suzuki, Kouhei Wakamatsu, Chiharu Yamada, Kanako Sato, Naoyuki Maejima, Tomoya Uruga, Mizuki Tada

Research output: Contribution to journalArticlepeer-review

Abstract

Cr-Loaded iron oxide with a dendritic crystalline structure was synthesized and the reversible crystalline phase transition during redox cycling of the iron oxide was investigated. X-ray diffraction and transmission electron microscopy analyses revealed that Cr was well dispersed and loaded in the iron oxide dendrite crystals, whose lattice constant was dependent on the Cr loading. Temperature-programmed oxidation and reduction experiments revealed the reversible redox properties of the Cr-loaded iron oxide dendrites, whose redox temperature was found to be lower than that of Cr-free iron oxide dendrites. In situ Fe K-edge and Cr K-edge X-ray absorption near-edge structure (XANES) analysis indicated that Cr loading extended the redox reaction window for conversion between Fe3O4 and γ-Fe2O3 owing to compressive lattice strain in the iron oxide spinel structures.

Original languageEnglish
Pages (from-to)28093-28099
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume22
Issue number48
DOIs
Publication statusPublished - 2020 Dec 28
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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