Abstract
The basic mantra of “structure-dictates-function” in chemistry has inspired tremendous interests in designing various architectures toward specific applications. In this work, hierarchically tailorable double-array structures composed of TiO2 nanotube arrays (TNTAs) and axially grown ZnO nanorod arrays (ZNRAs) have been constructed through a two-step anodization method combined with a heteroepitaxial growth process regulated by electrodeposited reduced graphene oxide (RGO). The obtained TNTAs/RGO/ZNRAs film hybrids exhibit enhanced photocatalytic and photoelectrochemical performances along with favorable photostability as compared to the single component and binary counterparts. This is ascribed to the synergistic effect of the matchable band alignment of the components, the 1D-on-1D double-array architecture with vectorial pathways for charge carriers transport, and the electrically conductive RGO for bridging the directional electron flow to further promote the separation and transfer of charge carriers. This work is anticipated to provide instructive recipe for rational design and construction of composite films with optimized photo(electro)catalytic performances.
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