▎ 摘　　要

Ta(2)O(5)has received great attention in high-energy supercapacitors because of biocompatibility, multielectron redox and wide voltage window, but poor electronic conductivity limits its practical applications. The study reports synthesis of Ta2O5-graphene composite (G-Ta2O5) mediated by salicylic acid ionic liquid. The synthesis strategy realizes three-dimensional structure, excellent dispersion, small size of G-Ta(2)O(5)nanorods and Schottky heterojunction. The unique structure improves the electronic conductivity and expands voltage window to 2 V. The G-Ta(2)O(5)symmetrical supercapacitors exhibits ultrahigh specific capacitance of 554.7F g(-1 )at 1 A g(-1), rate -capacity of 227.7F g(-1) at 50 A g(-1), capacity retention of 99.6% after 10,000 cycles at 1 A g(-1) and energy density of 77.04 W h Kg(-1) at 503.52 W kg(-1). The supercapacitors was integrated with green long afterglow phosphor -enhanced solar cell and pulse device to construct wearable self-powered pulse sensor system. The introduction of phosphor brings an increases of 5.14% in the photocurrent during day time and an additional electric energy required for the sensor to work for more than 3 h at night. The sensor system can work for a long time no need of any additional power supply and shows one broad application prospect in disease diagnosis and monitoring health.