▎ 摘　　要

Triboelectric nanogenerators (TENGs) demonstrate an attractive pathway to directly convert broadband mechanical energy into electrical energy for a green and clean energy source. Triboelectric material design with tailored work function has played a critical role in enhancing the output performance of TENGs. However, regulating the work function of triboelectric materials still remains challenging due to the limited particle/ group/ion doping rate. Here, we reported a simple defect-mediated strategy (DMS) to regulate the work function of graphene film (positive triboelectric material) by different contents of oxygen and carbon defects derived at annealing temperatures from 500 degrees C to 3000 degrees C. Our DMS features a continuous and wide-range tunable work function from 4.68 eV to 4.49 eV and the as-assembled TENGs produce output voltages and currents up to 190 V and 14 mu A, respectively. The efficient work function regulation of this type establishes a set of fundamental considerations in triboelectric material design, especially the two-dimensional materials, to enhance the energy harvesting and sensing performances of TENGs.