Heterogeneous three-dimensional TiO 2 /ZnO nanorod array for enhanced photoelectrochemical water splitting properties

Abstract

A 3D heterogeneous TiO₂/ZnO array was successfully synthesized on FTO substrate via hydrothermal process. The 3D TiO₂/ZnO array exhibited enhanced light absorption, decreased interface transfer resistance, enlarged carriers' density compared to TiO₂ photoanode, and TiO₂/ZnO array prepared with 10 mM Zn(NO₃)₂ exhibited the best performance. The maximum photocurrent density reached to ~ 1.1 mA/cm² and further increased to ~ 2.0 mA/cm² at 1.23 V vs RHE with the modification of Au nanoparticles. This work demonstrated a promising method for preparing heterogeneous three-dimensional TiO₂/ZnO nanorod array with excellent PEC performance for water splitting.

Graphical Abstract

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