Journal
ENERGY STORAGE MATERIALS
Volume 28, Issue -, Pages 307-314Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2020.01.028
Keywords
Biowaste; Porous carbon; Anti-freezing electrolyte; High performance; Zinc ion supercapacitors
Funding
- National Natural Science Foundation of China [U1802256, 51672128, 21773118, 21875107]
- Key Research and Development Program in Jiangsu Province [BE2018122]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Aqueous zinc-ion batteries have been widely reported as promising candidates for energy storage, but the research on zinc-ion based supercapacitors or hybrid supercapacitors has received little attention and the energy storage mechanism is still controversial. Here, a high-performance zinc-ion hybrid supercapacitor is successfully demonstrated with biowaste-derived porous carbon and cheap zinc foil. Thanks to the bivalent characteristic of zinc and electric double layer capacitive nature of porous carbon, as-assembed hybrid supercapacitors can achieve high energy density of 147.0 Wh kg(-1) at 136.1 W kg(-1) and a maximum power density of 15.7 kW kg(-1) at 65.4 Wh kg(-1) together with outstanding cycling stability (92.2% capacity retention after 10000 cycles at a high current density of 10 A g(-1)). Most importantly, 61.6% of the initial capacity at 1 A g(-1) can be remained even under a mass loading as high as 17 mg cm(-2). Significantly, the phase composition of byproducts formed in Zn(CF3SO3)(2) electrolyte have been confirmed by ex-situ experimental results and theoretical calculations. Besides, when appling optimized carbon cathode into quasi-solid-state hybrid supercapacitors with a unique anti-freezing hydrogel electrolyte, this device can well service at various bending states and relatively low temperature of -15 -degrees.
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