Hybrid Anionic Electrolytes for the High Performance of Aqueous Zinc-Ion Hybrid Supercapacitors

Bin Xie, Junjie He (), Yuchen Sun, Senlin Li and Jing Li ()
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Bin Xie: Biomass New Materials Research Center, College of Architectural Engineering, Yunnan Agricultural University, Kunming 650201, China
Junjie He: Biomass New Materials Research Center, College of Architectural Engineering, Yunnan Agricultural University, Kunming 650201, China
Yuchen Sun: Department of Science and Technology, Yunnan Agricultural University, Kunming 650201, China
Senlin Li: Department of Science and Technology, Yunnan Agricultural University, Kunming 650201, China
Jing Li: Department of Science and Technology, Yunnan Agricultural University, Kunming 650201, China

Energies, 2022, vol. 16, issue 1, 1-12

Abstract: Aqueous zinc-ion hybrid supercapacitors (AZHSs) are promising candidates for powering mobile devices due to their intrinsically high safety, the high theoretical capacity of zinc anodes, and the wide range of sources of raw materials for activated carbon (AC) cathodes. Here, we report that there is a synergistic effect between the anions of an AZHS electrolyte, which can significantly improve the specific capacity and rate capability of an AC cathode. The results showed that the specific capacities of the AC cathode//2 M ZnSO 4 (aq)//Zn anode energy storage system were 115 and 41 mAh g −1 at 0.1 and 5 A g −1 current densities, respectively. The specific capacity at a 0.1 A g −1 current density was enhanced to 136 mAh g −1 by doping 0.5% ZnCl 2 and 0.5% Zn(CF 3 SO 3 ) 2 in the 2 M ZnSO 4 electrolyte. The specific capacity at a 5 Ag −1 current density was enhanced to 69 mAh g −1 by doping 1% ZnCl 2 and 0.5% Zn(CF 3 SO 3 ) 2 in the 2 M ZnSO 4 electrolyte. In addition, the co-doped electrolyte increased the energy consumption of the binding of the AC surface groups with H + and inhibited the precipitation of Zn 4 SO 4 (OH) 6 ·5H 2 O. This provides an important perspective for improving the performance of AZHSs.

Keywords: aqueous zinc-ion hybrid supercapacitors; electrolyte; energy storage; co-doped (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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