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Graphene–Titania Hybrid Photoanodes by Supersonic Kinetic Spraying for Solar Water Splitting
Author(s) -
Lee JongGun,
Kim DoYeon,
Park JungJae,
Cha YouHong,
Yoon Joshua Y.,
Jeon Hyo Sang,
Min Byoung Koun,
Swihart Mark T.,
Jin Sungho,
AlDeyab Salem S.,
Yoon Sam S.
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13174
Subject(s) - graphene , photocurrent , water splitting , materials science , chemical engineering , photocatalysis , composite number , nanotechnology , composite material , optoelectronics , catalysis , chemistry , biochemistry , engineering
We report the synthesis of graphene– TiO 2 ( G–TiO 2 ) composite films that exhibit significantly enhanced photoelectrochemical water‐splitting performance relative to pure TiO 2 . Supersonic kinetic spraying was used to produce strongly adhered, electrically and mechanically robust G–TiO 2 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–TiO 2 composite films with 1.0 wt.% graphene exhibited photocurrent density ten times that of pure TiO 2 films. The electron transfer between TiO 2 and graphene suppresses the recombination of photoinduced charge carriers and prolongs the electron excited‐state lifetime, which contributes to the enhanced photoelectrochemical water‐splitting performance.