Abstract
Nitrogen-doped graphene quantum dots (NGQDs) were successfully synthesized via a solvothermal technique using citric acid as carbon and N, N-dimethylformamide (DMF) acting as a solvent and also a nitrogen source. The as-prepared quantum dots have a diameter of less than 5 nm with a highly crystalline structure resembling graphene. TiO2 nanorods (NRs) were hydrothermally grown on fluorine-doped tin oxide (FTO) coated glass substrate. A photoanode of NGQD decorated TiO2 NRs was studied for its photoelectrochemical performance. Scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and photoelectrochemical characterizations were performed to investigate the photoanode and its performance. The NGQD decorated TiO2 NR (NGQD/TiO2 NR) photoanode recorded an NGQD induced improvement of 36.7% in photocurrent density (at 5 V vs Ag/AgCl) and 58.7% in the photoconversion efficiency (η%).
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