▎ 摘　　要

Highly S and N co-doped graphene quantum dots (SNGQDs) with an average width of similar to 4 nm and a broad absorption band in the visible region of light were investigated as an effective light absorber, and their LUMO and HOMO energy states against the vacuum were determined using cyclic voltammetry for the first time. Vertically deposited TiO2 nanorods films were decorated with various amounts of the SNGQD solution (x = 5, 10, 20 and 30 mu L) by a spin coater and their photovoltaic properties were comprehensively investigated for water splitting applications. Optical characterizations reveal that the SNGQDs are highly photoluminescent and absorb UV and visible photons with wavelengths up to 700 nm. The prepared SNGQDs-x/TiO2 electrode shows a photocurrent enhancement of similar to 4.5 x as compared to the bare TiO2 electrode for the optimum sample (x = 20 mu L) at an applied voltage of P = 0.5 V using 1 M Na2SO4 solution as the electrolyte. (C) 2018 Elsevier B.V. All rights reserved.