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Issue 42, 2019
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Novel zinc–iodine hybrid supercapacitors with a redox iodide ion electrolyte and B, N dual-doped carbon electrode exhibit boosted energy density

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Abstract

With the development of modern society, energy storage has gradually become a crucial issue for portable devices and electric vehicles. Recently, zinc-ion hybrid supercapacitors (ZHSs), a new type of energy storage devices, have received significant attention mainly because zinc possesses many advantages such as natural abundance, low cost, non-toxicity and high safety. However, the limited energy density of the currently reported ZHSs should be further improved to achieve their large-scale applications. Herein, we designed novel zinc–iodine hybrid supercapacitors (Z-IHS) by introducing a redox iodide ion into the ZnSO4 electrolyte to improve the energy density and employing B, N dual-doped porous carbon microtubes (BN-CMTs) as a cathode to facilitate the faradaic reaction on the electrode surface by changing the electronic structure and density state of carbon. The BN-CMT-based Z-IHS exhibits the amazingly high capacity of 416.6 mA h g−1, a high energy density (472.6 W h kg−1) at the power density of 1600 W kg−1 in the voltage range of 0.2–1.8 V and excellent cycling stability with the capacity retention of 99.1% over 10 000 cycles at 10 A g−1. The strategy proposed in this study should provide a new insight into the exploration of high energy-density storage devices.

Graphical abstract: Novel zinc–iodine hybrid supercapacitors with a redox iodide ion electrolyte and B, N dual-doped carbon electrode exhibit boosted energy density

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Supplementary files

Article information


Submitted
04 Jul 2019
Accepted
23 Sep 2019
First published
24 Sep 2019

J. Mater. Chem. A, 2019,7, 24400-24407
Article type
Paper

Novel zinc–iodine hybrid supercapacitors with a redox iodide ion electrolyte and B, N dual-doped carbon electrode exhibit boosted energy density

L. Han, H. Huang, J. Li, Z. Yang, X. Zhang, D. Zhang, X. Liu, M. Xu and L. Pan, J. Mater. Chem. A, 2019, 7, 24400
DOI: 10.1039/C9TA07196B

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