A low cost Zn2+/I− redox active electrolyte for a high energy and long cycle-life zinc hybrid battery–capacitor

文献情報

出版日 2023-11-01

DOI 10.1039/D3TA03912A

インパクトファクター 12.732

著者

Balamurugan Selvaraj, Balaji Sambandam, Sungjin Kim, Vinod Mathew, Sehong Seo, Moonsu Song, Jaekook Kim

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要旨

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.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

A low cost Zn2+/I− redox active electrolyte for a high energy and long cycle-life zinc hybrid battery–capacitor

文献情報

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Journal of Materials Chemistry A

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