▎ 摘　　要

While the ever-increasing energy crisis for sustainable and renewable energy sources has prompted the development of innovative materials for photoelectrochemical water oxidation, the techniques to enhance solar-to-hydrogen efficiency and provide long-term stability remain significant challenges. In this work, we report a ternary material system based on reduced graphene oxide (r-GO) and copper-tetracyanoquinodimethane (Cu-TCNQ) decorated on anodically aligned TiO2 nanotubes (TONTs), which simultaneously improve the charge separation and water oxidation kinetics. r-GO and Cu-TCNQ were sequentially decorated on the surface of TONTs by a facile electrophoretic deposition method and marked in brief as TONTs/r-GO/Cu-TCNQ The fabricated TONT/r-GO/Cu-TCNQ photoanode film was systematically characterized by various techniques, namely, X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy, field emission-scanning electron microscopy, field emission-transmission electron microscopy, and X-ray photoelectron spectroscopy. Photoelectrochemical water oxidation was evaluated in 1 M NaOH as an electrolyte, and the TONT/r-GO/Cu-TCNQ photoanode film exhibited a considerably improved J(SC) (photocurrent density) value of 0.72 mA/cm(2) at 1.23 V versus V RHE (reversible hydrogen electrode) compared to the J(SC) value (0.30 mA/cm(2)) of bare TONTs. The obtained experimental results demonstrated that r-GO with a high work function and higher electron mobility accepts photogenerated electrons from the conduction band of TONTs and leads to suppressed charge recombination and favorable charge separation/transfer events, whereas Cu-TCNQacts as an oxygen evolution reaction co-catalyst, which accepts photogenerated holes from the valence band of TONTs, accelerating the surface water oxidation reaction. Additionally, photoluminescence spectroscopy, incident photon-to-current efficiency, Mott-Schottky plot, and electrochemical impedance spectroscopy confirmed that the r-GO and Cu-TCNQ complexes boost the charge separation/transfer events.