Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 599, Issue -, Pages 556-565Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.04.114
Keywords
Alkaline zinc-carbon hybrid supercapacitors; Suitable defect construction; Abundant hierarchical pore structure; B; N dual doped carbon
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Funding
- National Natural Science Foundation of China [21875068]
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An aqueous alkaline zinc-carbon hybrid supercapacitor (AZCHS) with an optimized design was proposed in this work, showing a high energy density of 115.7 Wh kg-1 at a power density of 711.6 W kg-1, with excellent stability. The optimized AZCHS is a promising candidate for energy storage applications.
Zinc-based energy storage systems (zinc-air, zinc-nickel and zinc-ion batteries and zinc-ion hybrid supercapacitors (ZHSs) are considered as promising power sources for wide applications from personal electronic devices to electric vehicles. However, these systems, especially the Zn-based hybrid supercapacitors, display unsatisfying power density and energy density, which should be enhanced for their large-scale applications. In this work, aqueous alkaline zinc-carbon hybrid supercapacitors (AZCHS) were designed, consisting of B, N dual doped carbon cathode, Zn anode and KOH electrolyte. The B, N dual doped carbon was prepared via thermal treatment of metal-organic frameworks and boric acid, which exhibits abundant hierarchical pore structure (micropore, mesopore and macropore) and suitable defect construction, promoting ion diffusion/charge transfer and providing more rapid surface pseudocapacitance reaction. More obviously, when the optimized B, N dual doped carbon was used as cathode in A-ZCHS and ZHS, more capacitive charge storage and rapider electrochemical kinetics can be observed in A-ZCHS than in ZHS. Therefore, the optimized A-ZCHS displays a high energy density of 115.7 Wh kg-1 at the power density of 711.6 W kg-1 with excellent stability, which is much better than most of ZHSs reported previously. The A-ZCHS should be a promising candidate for energy storage applications. (c) 2021 Elsevier Inc. All rights reserved.
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