Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 18, Pages 20349-20357Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c13378
Keywords
redox electrolytes; supercapacitors; mesoporous carbon; viologen anolyte; aqueous hybrid electrochemical capacitors; electrochemical capacitors (redox-ECs) provide increased
Funding
- Swedish Energy Agency [39045-1]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2021R1C1C1012346]
- GIST Research Institute (GRI) - GIST in 2021
- National Research Foundation of Korea [2021R1C1C1012346] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Compared to traditional electric double-layer capacitors, redox-enhanced electrochemical capacitors show higher energy density and more stable power output. This study aims to understand the electrochemical mechanisms of the aqueous pentyl viologen/bromide dual redox system at the interface of ordered mesoporous carbon and improve device performance.
Compared to traditional electric double-layer capacitors, redoxenhanced electrochemical capacitors (redox-ECs) show increased energy density and steadier power output thanks to the use of redox-active electrolytes. The aim of this study is to understand the electrochemical mechanisms of the aqueous pentyl viologen/bromide dual redox system at the interface of an ordered mesoporous carbon (CMK-8) and improve the device performance. Cells with CMK-8 carbon electrodes were investigated in several configurations using different charging rates and potential windows. The pentyl viologen electrochemistry shows a mixed behavior between solution-based diffusion and adsorption phenomena, with the reversible formation of an adsorbed layer. The extension of the voltage window allows for full reduction of the viologen molecules during charge and a consequent increase in the specific discharge energy delivered by the cell. Investigation of the mechanism indicates that a 1.5 V charging voltage with a 0.5 A g-1 charging rate and fast discharge rate produces the best overall performance.
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