• 文献标题:   Ta2O5-graphene Schottky heterojunction composite symmetric supercapacitor with ultrahigh energy density for self-powered pulse sensor driven by green long afterglow phosphor-enhanced solar cell
  • 文献类型:   Article
  • 作  者:   ZHIJUN C, KETING Z, YONGQIANG Y, PENGWU X, RUIYI L, GUANGLI W, ZAIJUN L, XIAOHAO L
  • 作者关键词:   ta2o5graphene hybrid, highenergy supercapacitor, wearable sensor, health monitoring
  • 出版物名称:   APPLIED SURFACE SCIENCE
  • ISSN:   0169-4332 EI 1873-5584
  • 通讯作者地址:  
  • 被引频次:   3
  • DOI:   10.1016/j.apsusc.2022.154730 EA SEP 2022
  • 出版年:   2022

▎ 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.