Abstract
Porous carbon fibers are promising cathodes for zinc-ion hybrid supercapacitors(ZHSs)owing to their abundant active sites,great conductivity,and stable physi-cal and chemical properties.However,designing a proper preparation technique to regulate the microstructure of carbon fibers still remains a great challenge.Here,a polyvinylpyrrolidone/po-lyacrylonitrile(PVP/PAN)-derived porous carbon fiber is developed via the PVP/PAN blend electrospinning and hydrothermal selective PVP removal strategy.The hydrothermal selective PVP removal strategy can effectively avoid a cross-linking between PVP and PAN during the traditional stabilization at air atmo-sphere.In PVP/PAN-derived porous carbon fiber,the suf-ficient micropores provide abundant space for the Zn2+storage,whereas the proper mesopores contribute to the fast ion transfer.These hierarchical porous structures endow ZHSs with high specific capacity and high-rate performance.The ZHS assembled with the optimal PVP/PAN-derived porous carbon fiber(PVP-PANC-0.8)dis-plays an outstanding specific capacity of 208 mAh·g-1,high rate capability(49.5％)from 0.5 to 5 A·g-1,and 72.25％capacity retention after 10,000 cycles at 0.5 A·g-1.
基金项目
Shandong Provincial Natural Science Foundation(ZR2022ME181)
National Natural Science Foundation of China(51702123)
University of Jinan Science and Technology Planning Project(XKY2034)
Education Bureau of Jinan,China(JNSX2023015)
NETL
NSTL
万方数据