Zinc-ion hybrid supercapacitors with ultrahigh areal and gravimetric energy densities and long cycling life  

作　　者：Ahmad Amiri M.Naraghi Andreas A.Polycarpou 

机构地区：[1]J.Mike walker’66 mechanical engineering department,texas a&m university,college station,TX 77843,USA [2]department of aerospace engineering,texas a&m university,college station,TX 77843,USA

出　　处：《Journal of Energy Chemistry》2022年第7期480-491,I0012,共13页能源化学（英文版）

摘　　要：Zinc ion hybrid supercapacitor (ZIHSC) with promising energy and power densities is an excellent answer to the ever-growing demand for energy storage devices.The restricted lifespan due to the dendrite formation on metallic zinc (Zn) is one of the main roadblocks.Herein,we investigate the electrochemical capability of oxygen-enriched porous carbon nanofibers (A-CNF) and nitrogen,oxygen-enriched porous carbon nanofibers (N-CNF) cathode materials for structural ZIHSCs.To this end,a series of samples with different chemical compositions (N and O contents) are prepared to present deep insight into the electrochemical mechanism between N/O doping and Zn-ion storage.The as-prepared ZIHSC in the presence of N-CNF cathode and Zn Cl_(2) electrolyte offers a battery-level gravimetric energy density of 143.2 Wh kg^(-1)at a power density of 367.1 W kg^(-1).The free-standing N-CNF electrodes in ZIHSCs enjoy delivering an outstanding areal energy density of 110.4μWh cm^(-2)at 0.24 m W cm^(-2),excellent rate capability,and noticeable cycling stability over 10,000 cycles at 10 A g^(-1)with less than 7%decay.It was also concluded that active pyrrolic N dopants might deliver and facilitate more pseudocapacitance in ZIHSCs than other N configurations,resulting in higher adsorption/desorption and insertion/extraction process of Zn Cl^(+).Taking advantage of the beneficial properties of a free-standing continuous cathode,this novel generation of structural cathode material offers high areal and gravimetric energy densities and mechanical properties in a single zinc-ion-based package.

关 键 词：Porous carbon nanofibers Zinc chloride electrolyte Zinc ion hybrid supercapacitors NITROGEN-DOPING ACTIVATION Energy density 

分 类 号：TM53[电气工程—电器] TQ342[化学工程—化纤工业]