Qiu Xuan, Wang Nan, Wang Zhuo, Wang Fei, Wang Yonggang
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, 200433, China.
Department of Materials Science, Fudan University, Shanghai, 200433, China.
Angew Chem Int Ed Engl. 2021 Apr 19;60(17):9610-9617. doi: 10.1002/anie.202014766. Epub 2021 Mar 17.
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 ). 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 . We demonstrate that the charge storage of cathode mainly occurs in macropores, showing high rate performance at high mass loading (40 mg cm ). Furthermore, the aprotic nature of electrolyte and formation of Zn -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 ) and Zn-anode, the energy density reaches 25.9 Wh kg .
锌基水系超级电容器正吸引着广泛关注。然而，大多数报道的长寿命和高功率性能是在低锌利用率（<0.6%）和阴极低质量负载（<2 mg cm²）的情况下实现的。而且，许多所获得的高能量密度通常在未考虑锌阳极质量的情况下进行评估。在此，我们提出一种锌基混合超级电容器，它包括一个金属有机框架衍生的多孔碳阴极、一个锌阳极以及一种含Zn²⁺的基于N，N - 二甲基甲酰胺（DMF）的电解质。我们证明阴极的电荷存储主要发生在大孔中，在高质量负载（40 mg cm²）下表现出高倍率性能。此外，电解质的非质子性质以及Zn²⁺ - DMF络合物的形成避免了锌的腐蚀和枝晶形成。因此，该超级电容器具有高锌利用率（2.2%）的长寿命（9000次循环）。当以阴极（40 mg cm²）和锌阳极的总质量计算时，能量密度达到25.9 Wh kg⁻¹。
