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用于高性能对称和水系锌离子混合超级电容器的中空介孔碳球

Hollow Mesoporous Carbon Spheres for High Performance Symmetrical and Aqueous Zinc-Ion Hybrid Supercapacitor.

作者信息

Chen Sihan, Yang Gaoqi, Zhao Xiaojuan, Wang Nengze, Luo Tingting, Chen Xu, Wu Tianci, Jiang Shijie, van Aken Peter A, Qu Shile, Li Tao, Du Liang, Zhang Jun, Wang Hanbin, Wang Hao

机构信息

Hubei Key Laboratory of Ferro and Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan, China.

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, China.

出版信息

Front Chem. 2020 Sep 15;8:663. doi: 10.3389/fchem.2020.00663. eCollection 2020.

Abstract

Zinc-ion hybrid supercapacitors are a promising energy storage device as they simultaneously combine the high capacity of batteries and the high power of supercapacitors. However, the practical application of Zinc-ion hybrid supercapacitors is hindered by insufficient energy density and poor rate performance. In this study, a symmetrical zinc-ion hybrid supercapacitor device was constructed with hollow mesoporous-carbon nanospheres as electrode materials, and aqueous ZnSO adopted as an electrolyte. Benefiting from the mesoporous structure and high specific area (800 m/g) of the hollow carbon nanospheres, fast capacitor-type ion adsorption/de-adsorption on both the cathode and the anode can be achieved, as well as additional battery-type Zn/Zn electroplating/stripping on the anode. This device thus demonstrates outstanding electrochemical performance, with high capacity (212.1 F/g at 0.2 A/g), a high energy density (75.4 Wh/kg at 0.16 kW/kg), a good rate performance (34.2 Wh/kg energy density maintained at a high power density of 16.0 kW/kg) and excellent cycling stability with 99.4% capacitance retention after 2,500 cycles at 2 A/g. The engineering of this new configuration provides an extremely safe, high-rate, and durable energy-storage device.

摘要

锌离子混合超级电容器是一种很有前景的储能装置,因为它们同时兼具电池的高容量和超级电容器的高功率。然而,锌离子混合超级电容器的实际应用受到能量密度不足和倍率性能不佳的阻碍。在本研究中,构建了一种对称的锌离子混合超级电容器装置,以中空介孔碳纳米球作为电极材料,并采用硫酸锌水溶液作为电解质。受益于中空碳纳米球的介孔结构和高比表面积(800 m²/g),在阴极和阳极上都能实现快速的电容型离子吸附/脱附,以及在阳极上额外的电池型锌/锌电镀/剥离。该装置因此展现出出色的电化学性能,具有高容量(在0.2 A/g时为212.1 F/g)、高能量密度(在0.16 kW/kg时为75.4 Wh/kg)、良好的倍率性能(在16.0 kW/kg的高功率密度下保持34.2 Wh/kg的能量密度)以及优异的循环稳定性,在2 A/g下循环2500次后电容保持率为99.4%。这种新结构的设计提供了一种极其安全、高倍率且耐用的储能装置。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/38f8/7533584/33285dc6415d/fchem-08-00663-g0001.jpg

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