Abstract
Flower like rutile TiO2 films were decorated with green-photoluminescent graphene quantum dots (GQDs) and photovoltaic properties were investigated for water splitting application. Rutile TiO2 nanoflowers (NFs) and GQDs (average width of ∼12 nm) synthesized separately using a hydrothermal method and TiO2 NFs were decorated with various amounts of GQDs solution (x = 5, 10, 15 and 20 µL) by spin coating. Optical characterization reveals that GQDs are highly luminescent and absorb UV and visible light photons with wavelengths up to 700 nm. GQDs-x/TiO2 electrode shows a photocurrent enhancement of ∼ 95% compared to pristine TiO2 NFs for the optimum sample (x = 15 µL) at an applied potential of P = 0 V using 1 M Na2SO4 solution as electrolyte.
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