▎ 摘　　要

NOVELTY - This creation provides a composite nanofiber, its preparation method and its application. The composite nanofiber includes titanium dioxide nanofiber and a composite modified material, wherein the composite modified material contains zirconium dioxide and reduced graphene oxide; wherein the diameter of the composite nanofiber is greater than or equal to 120 nanometers and less than or equal to 260 nanometers, the specific surface area of the composite nanofiber is greater than or equal to 35 m2/g and less than or equal to 100 m2/g. As a result, the composite nanofibers used in the photoanode of dye-sensitized solar cells can provide better electron transport capabilities, thereby improving the photovoltaic characteristics and photoelectric conversion efficiency of dye-sensitized solar cells.