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Graphite Oxide as a Photocatalyst for Hydrogen Production from Water
Author(s) -
Yeh TeFu,
Syu JhihMing,
Cheng Ching,
Chang TingHsiang,
Teng Hsisheng
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201000274
Subject(s) - photocatalysis , materials science , water splitting , graphite oxide , oxide , hydrogen production , band gap , aqueous solution , graphite , hydrogen , semiconductor , irradiation , chemical engineering , methanol , photochemistry , photocatalytic water splitting , visible spectrum , nanotechnology , catalysis , optoelectronics , composite material , organic chemistry , chemistry , metallurgy , physics , nuclear physics , engineering
Abstract A graphite oxide (GO) semiconductor photocatalyst with an apparent bandgap of 2.4–4.3 eV is synthesized by a modified Hummers' procedure. The as‐synthesized GO photocatalyst has an interlayer spacing of 0.42 nm because of its moderate oxidation level. Under irradiation with UV or visible light, this GO photocatalyst steadily catalyzes H 2 generation from a 20 vol % aqueous methanol solution and pure water. As the GO sheets extensively disperse in water, a cocatalyst is not required for H 2 generation over the GO photocatalyst. During photocatalytic reaction, the GO loses some oxygen functional groups, leading to bandgap reduction and increased conductivity. This structural variation does not affect the stable H 2 generation over the GO. The encouraging results presented in this study demonstrate the potential of graphitic materials as a medium for water splitting under solar illumination.