title: 2D ZnIn(2)S(4) nanosheet/1D TiO(2) nanorod heterostructure arrays for improved photoelectrochemical water splitting.
abstract: We report the fabrication of 2D ZnIn2S4 nanosheet/1D TiO2 nanorod heterojunction arrays by a facile hydrothermal process and their use as photoelectrodes in a photoelectrochemical (PEC) cell for high-performance solar water splitting. The morphology, microstructure, and phase of pristine TiO2 and 2D ZnIn2S4 nanosheet/1D TiO2 nanorod heterojunction arrays were characterized in detail. PEC measurements showed that 2D/1D heterojunction arrays offered enhanced photocurrent density (3 times higher than that of pristine TiO2), negatively shifted onset potential from 0.05 to -0.53 V, and high light on/off cycle stability. Electrochemical impedance investigation attested to a significant improvement of the interface electron transfer kinetics in this heterojunction, thus facilitating electron-hole separation, transfer, and collection, which resulted in enhanced PEC properties.
authors.affiliation: College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215006, P. R. China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Liu
authors.forename: Hao
authors.initials: H
authors.lastname: Lu
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Shi
authors.forename: Fangli
authors.initials: F
authors.lastname: Wu
authors.forename: Jun
authors.initials: J
authors.lastname: Guo
authors.forename: Kaimo
authors.initials: K
authors.lastname: Deng
authors.forename: Liang
authors.initials: L
authors.lastname: Li
keywords: TiO2; ZnIn2S4; heterojunction; nanorods; nanosheets; photoelectrochemical cell