H2O/D2O exchange on SnO2 materials in the presence of CO: Operando spectroscopic and electric resistance measurements

Roman G. Pavelko, Joong Ki Choi, Atsushi Urakawa, Masayoshi Yuasa, Tetsuya Kida, Kengo Shimanoe

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4 Citations (Scopus)

Abstract

Water isotope exchange in the presence of CO on two undoped tin dioxides has been studied using modulation excitation diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and resistance measurements at 300 C. Our results reveal that the material synthesized from tin tetrachloride (SnO2Cl) manifests higher affinity to chemisorbed water than that made from tin hydroxide acetate (SnO2Ac). The latter was shown to exhibit a strong correlation between the evolution of surface OH groups (bridging type, involved in hydrogen bonding) and electric resistance upon increasing concentration of CO. Water desorption kinetics, being independent of CO concentration for both materials, was found to be slower for SnO 2Cl by ca. 30% with respect to SnO2Ac. High affinity to water as well as low sensor signals to CO in humid air reported for SnO 2Cl were proposed to originate from traces of Cl ions (about 0.15 wt % for SnO2Cl and 0.03 wt % for SnO2Ac) and not microstructure, which has been confirmed to be similar for both materials. Two types of water adsorption and two CO sensing mechanisms are proposed for SnO2Cl and SnO2Ac on the basis of the results.

Original languageEnglish
Pages (from-to)2554-2563
Number of pages10
JournalJournal of Physical Chemistry C
Volume118
Issue number5
DOIs
Publication statusPublished - Feb 6 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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