Thermally Stable N2-Intercalated WO3 Photoanodes for Water Oxidation
By Mi, Qixi; Ping, Yuan; Li, Yan; Cao, Bingfei; Brunschwig, Bruce S.; Khalifah, Peter G.; Galli, Giulia A.; Gray, Harry B. & Lewis, Nathan S.
Published in Journal of the American Chemical Society
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2012
Abstract
We describe stable intercalation compounds of the composition xN2·WO3 (x = 0.034–0.039), formed by trapping N2 in WO3. The incorporation of N2 significantly reduced the absorption threshold of WO3; notably, 0.039N2·WO3 anodes exhibited photocurrent under illumination at wavelengths ≤640 nm with a faradaic efficiency for O2 evolution in 1.0 M HClO4(aq) of nearly unity. Spectroscopic and computational results indicated that deformation of the WO3 host lattice, as well as weak electronic interactions between trapped N2 and the WO3 matrix, contributed to the observed red shift in optical absorption. Noble-gas-intercalated WO3 materials similar to xN2·WO3 are predicted to function as photoanodes that are responsive to visible light.
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