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

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 advan...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (42), p.244-2447
Main Authors: Han, Lu, Huang, Hailong, Li, Junfeng, Yang, Zhongli, Zhang, Xinlu, Zhang, Dafeng, Liu, Xinjuan, Xu, Min, Pan, Likun
Format: Article
Language:English
Subjects:
Carbon
Density
Electric vehicles
Electrodes
Electrolytes
Electronic structure
Energy
Energy storage
Flux density
Hybrid vehicles
Iodides
Iodine
Portable equipment
Supercapacitors
Toxicity
Zinc
Zinc sulfate
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Summary: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 ZnSO 4 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. A novel high-energy-density zinc-iodine hybrid supercapacitor was designed via the introduction of a redox iodide ion electrolyte and B, N dual-doped carbon electrode.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta07196b