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SEM images for WO3 hydrate film with sheetlike nanostructures with (a) (NH4)2SO4, (b) Na2SO4 and (c) CH3COONH4 as capping agent; (d) absorption spectra of WO3 films; (e) current-potential scans of WO3 films measured in darkness and under illumination in a 1-M H2SO4 electrolyte containing 0.1-M methanol. Reproduced from [97], with permission from American Chemical Society, 2011.
