| Autor: |
Selvaraj, Balamurugan, Sambandam, Balaji, Kim, Sungjin, Mathew, Vinod, Seo, Sehong, Song, Moonsu, Kim, Jaekook |
| Zdroj: |
Journal of Materials Chemistry A; 11/28/2023, Vol. 11 Issue 44, p24219-24227, 9p |
| Abstrakt: |
The limited capacities and energy densities in zinc hybrid capacitors are due to the cathode materials and electrolytes that should be further improved to satisfy large-scale applications. To overcome this challenge, in this study, an aqueous zinc hybrid battery–capacitor (AZHBC) using low cost/concentration KI redox additive-added aqueous ZnSO4 as the electrolyte, Zn metal as the anode, and heteroatom-containing porous carbon (PC) derived from gelatin bio-polymer as the cathode material is developed. The AZHBC configured as Zn//ZnSO4 + KI//PC exhibited a high capacity of 399 mA h gC−1 and a high energy density of 479.1 W h kg−1 in the voltage range of 0.2–1.8 V, which were higher than those of the high-cost ZnI2 additive-containing Zn//ZnSO4 + ZnI2//PC AZHBC, respectively. This result can be attributed to the role of the KI additive, which enhances polyiodide redox reactions (3I−/I3−, 2I−/I2 and 2I3−/3I2) at the interfacial surface of the PC electrode, and the enhanced faradaic reaction. Additionally, 1 M ZnSO4 + 0.08 M KI is identified as the optimal electrolyte concentration as it exhibited the best performance (high capacity retention (∼94.5%) after 6000 prolonged cycles). The strategy proposed in this correlation study will provide insight into the exploration of suitable and best redox additives for high-energy low-cost redox active-AZHBCs. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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