Abstract
Hydrogen intercalation via a spillover reaction in new metastable oxides of the MoO 3-WO 3 system leads to the formation of the corresponding hydrogen bronzes. Phase ranges and variation of both lattice cells and parameters with the intercalated hydrogen content have been established for hexagonal H x WO 3, H x Mo 0.44W 0.56O 3 with hexagonal-type structure, H x MoO 3 and H x Mo 0.72W 0.28O 3 with ReO 3-type structure. The effect of the host lattice crystal structure, of the Mo(V I) content of the parent oxide, on hydrogen intercalation content, on the reversibility of the reaction and on the distortions induced by hydrogen intercalation in the parent oxide framework have also been established and discussed. Electrochemical hydrogen intercalation into these oxides has been studied in relation to electrochromic applications.
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