▎ 摘　　要

Taper-like ZnO nanorods arrays were grown on fluorine doped tin oxide (FTO) coated glass substrates by hydrothermal method. Microstructural evolutions from nanorods to nanotapes and photoelectrochemical (PEC) properties of all photoanodes were studied at various growth conditions. Nanotaper based photoanodes demonstrated superior photoconversion efficiency, higher short circuit current and minimal charge transfer resistance compared to ZnO nanorods. The PEC activities of ZnO nanotapers have been further improved after sensitization with nitrogen doped graphene quantum dots (NGQDs). The maximum photoconversion efficiency (eta), short circuit current (J(sc)) and incident photon-to-current conversion efficiency (IPCE) were achieved up to similar to 1.15%, similar to 1.04 mA/cm(2), and IPCE approximate to 74.5%, respectively, which confirmed the best PEC performance among others undoped ZnO nanostructured based photoanodes. The potential application of NGQDs sensitized nano taper photoanodes in quantum dot sensitized solar cells has been demonstrated.