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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
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Exploring the Carbon/Electrolyte Interface in Supercapacitors Operating in Highly Concentrated Aqueous Electrolytes.
Cyrille Neto1,2, Hien T T Pham1,2, Rachelle Omnée1,2
1CNRS, CEMHTI UPR3079, Univ. Orléans, 1D avenue de la Recherche Scientfique, 45071 Orléans, France.
ACS Applied Materials & Interfaces
|September 23, 2022
Summary
Superconcentrated electrolytes, or water-in-salt electrolytes (WISEs), enable safer aqueous energy storage. This study reveals how WISE structure impacts charge storage mechanisms in carbon-based supercapacitors.
Area of Science:
- Electrochemistry
- Materials Science
- Physical Chemistry
Background:
- Superconcentrated electrolytes, or water-in-salt electrolytes (WISEs), offer a path to safer, nonflammable aqueous batteries and supercapacitors.
- Understanding the charging mechanism is crucial for optimizing WISE-based devices.
Purpose of the Study:
- To investigate the carbon/electrolyte interface in carbon/carbon supercapacitors utilizing novel superconcentrated electrolytes.
- To elucidate the impact of electrolyte structure on charge storage mechanisms.
Main Methods:
- Electrochemical measurements
- Raman spectroscopy
- Nuclear Magnetic Resonance (NMR) spectroscopy
- Mass spectrometry
Main Results:
- NMR spectroscopy provided insights into the local environment of electrolyte ions within carbon electrode pores.
- Electrolyte structure was found to be highly dependent on electrolyte concentration.
- Electrolyte structure significantly influences charge storage mechanisms at both positive and negative electrodes.
Conclusions:
- The study highlights the critical role of electrolyte structure in the performance of superconcentrated electrolyte-based supercapacitors.
- Optimizing electrode/electrolyte pairings requires a deep understanding of the interface and ion behavior.
Keywords:
aqueous supercapacitorscarbon/carbon supercapacitorscharge storage mechanismconcentration effectelectrode/electrolyte interfaceelectrolyte structureshighly concentrated electrolyteswater-in-salt electrolytesMore Related Videos
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