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Chemical preintercalation synthesis approach for the formation of new layered tungsten oxides

Journal Article · · Journal of Materials Science
 [1];  [1];  [2];  [1]
  1. Drexel Univ., Philadelphia, PA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Tungsten oxide, WO3·nH2O, is a unique layered oxide material that offers enhanced performance in electrochromic and energy storage applications. Herein, we report the formation of a new, never previously synthesized, Na-containing layered tungsten oxide phase, Na0.20WO3·0.81H2O, using a chemical preintercalation approach. The structure and composition of this novel phase were investigated via microscopy, spectroscopy, and diffraction methods. Electrochemical cycling of Na0.20WO3·0.81H2O electrodes revealed initial discharge capacities of 37.43 mAh g-1, 480.8 mAh g-1, and 253.2 mAh g-1 in aqueous H2SO4 cells (potential window of - 0.2–0.8 V vs. Ag/AgCl), non-aqueous Li-ion cells (potential window of 0.1–4.0 V vs. Li/Li+), and non-aqueous Na-ion cells (potential window of 0.1–4.0 V vs. Na/Na+), respectively. Additionally, a reversible, pressure-induced color change from pale yellow to dark brown/black was observed for the Na0.20WO3·0.81H2O sample when it was placed under pressures of 1000 psi or higher. Our results demonstrate the viability of chemical preintercalation synthesis approach to produce new oxide phases with interesting functional properties.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1876288
Journal Information:
Journal of Materials Science, Journal Name: Journal of Materials Science Journal Issue: 16 Vol. 57; ISSN 0022-2461
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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