▎ 摘　　要

NOVELTY - Cable type structure graphene-doped titanium nitride (TiN)/carbon (C) nanofiber comprises skin layer and core layer, where skin layer comprises TiN, graphene and carbon matrix, and core layer is copper nanowires. It has diameter of 100-500 nm and porosity of 0.1-0.8 cm3/g. USE - Cable type structure graphene-doped TiN/C nanofiber used for counter electrode of dye-sensitized solar cell (claimed). ADVANTAGE - The preparation of cable type structure graphene-doped TiN/C nanofiber uses simple electrospinning and carbonization process, has simple operation and low cost, and is environmentally friendly. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of cable type structure graphene-doped TiN/C nanofiber comprising adding titanium dioxide (TiO2) and graphene oxide in N,N-dimethylformamide, dissolving, dispersing uniformly, adding polyacrylonitrile, ultrasonically dispersing, vigorously stirring at 50-80 degrees C for 3-8 hours to obtain skin layer TiO2 precursor solution, taking dimethylformamide (DMF) as solvent, adding polymethyl methacrylate and copper acetate, vigorously stirring for 3-8 hours at 50-80 degrees C, obtaining spinning solution as core layer solution, taking spinning solution as core solution and TiO2 precursor as skin layer solution, electrospinning nanofiber felt at spinning voltage of 15-25 kV, spinning temperature of 20-25 degrees C, receiving distance of 10-25 cm, air humidity of 25-40% relative humidity, core layer spinning flow rate of 0.2-0.5 ml/hour, and skin layer spinning flow rate of 0.1-0.4 ml/hour, pre-oxidizing the nanofiber felt at 220-280 degrees C and 1-3 degrees C/minute, heat preserving for 4-10 hours, increasing temperature to 800-1000 degrees C at 2-8 degrees C/minute for 2-5 hours under ammonia gas atmosphere, and obtaining the product; and (2) application of cable type structure graphene-doped TiN/C nanofiber for counter electrode of dye-sensitized solar cell comprising doping the cable type structure graphene-doped TiN/C nanofiber with ethyl cellulose solution containing carbon black bonded to conductive glass substrate to obtain the counter electrode of dye-sensitized solar cell.