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 for-mation 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 electro-chemical mechanism between N/O doping and Zn-ion storage.The as-prepared ZIHSC in the presence of N-CNF cathode and ZnCl2 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 out-standing areal energy density of 110.4 μWh cm-2 at 0.24 mW cm-2,excellent rate capability,and notice-able 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 ZnCl+.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 proper-ties in a single zinc-ion-based package.

Ahmad Amiri;M.Naraghi;Andreas A.Polycarpou

J.Mike Walker'66 Mechanical Engineering Department,Texas A&M University,College Station,TX 77843,USA;Department of Aerospace Engineering,Texas A&M University,College Station,TX 77843,USA

能源化学

[1]Ahmad Amiri;M.Naraghi;Andreas A.Polycarpou-.Zinc-ion hybrid supercapacitors with ultrahigh areal and gravimetric energy densities and long cycling life)[J].能源化学,2022(07):480-491

ZIHSC,ZIHSCs,ZnCl+

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