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Towards High‐Performance Zinc‐Based Hybrid Supercapacitors via Macropores‐Based Charge Storage in Organic Electrolytes
Author(s) -
Qiu Xuan,
Wang Nan,
Wang Zhuo,
Wang Fei,
Wang Yonggang
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202014766
Subject(s) - supercapacitor , anode , cathode , electrolyte , zinc , galvanic anode , chemical engineering , energy storage , battery (electricity) , materials science , inorganic chemistry , electrochemistry , chemistry , metallurgy , cathodic protection , electrode , physics , power (physics) , quantum mechanics , engineering
Zn‐based aqueous supercapacitors are attracting extensive attention. However, most of the reported long‐life and high‐power performances are achieved with low Zn‐utilization (<0.6 %) and low mass loading in cathode (<2 mg cm −2 ). And, many obtained high energy densities are generally evaluated without considering the mass of Zn‐anode. Herein, we propose a Zn‐based hybrid supercapacitor, involving a metal organic framework derived porous carbon cathode, a Zn‐anode and an N, N‐dimethylformamide (DMF)‐based electrolyte containing Zn 2+ . We demonstrate that the charge storage of cathode mainly occurs in macropores, showing high rate performance at high mass loading (40 mg cm −2 ). Furthermore, the aprotic nature of electrolyte and formation of Zn 2+ ‐DMF complex avoid the Zn‐corrosion and dendrite formation. Therefore, the supercapacitor shows a long‐life (9,000 cycles) with a high Zn‐utilization (2.2 %). When calculated with the total mass of cathode (40 mg cm −2 ) and Zn‐anode, the energy density reaches 25.9 Wh kg −1 .