Graphene-Titania Hybrid Photoanodes by Supersonic Kinetic Spraying for Solar Water Splitting
- Graphene-Titania Hybrid Photoanodes by Supersonic Kinetic Spraying for Solar Water Splitting
- Jong-Gun Lee; Do-Yeon Kim; Jung-Jae Park; You-Hong Cha; Joshua Y. Yoon; 전효상; 민병권; Mark T. Swihart; Sungho Jin; Salem S. Al-Deyab; Sam S. Yoon
- graphene; titania; water splitting
- Issue Date
- Journal of the American Ceramic Society
- VOL 97, NO 11, 3660-3668
- We report the synthesis of graphene–TiO2 (G–TiO2) composite films that exhibit significantly enhanced photoelectrochemical water-splitting performance relative to pure TiO2. Supersonic kinetic spraying was used to produce strongly adhered, electrically and mechanically robust G–TiO2 composite films containing 0.1, 0.5, 1.0, and 5.0 wt.% graphene. Films with an intermediate graphene content of 1.0 wt.% demonstrated the best water-splitting performance. G–TiO2 composite films with 1.0 wt.% graphene exhibited photocurrent density ten times that of pure TiO2 films. The electron transfer between TiO2 and graphene suppresses the recombination of photoinduced charge carriers and prolongs the electron excited-state lifetime, which contributes to the enhanced photoelectrochemical watersplitting performance.
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