Insight into the origin of carbon corrosion in positive electrodes of supercapacitors

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Title: Insight into the origin of carbon corrosion in positive electrodes of supercapacitors
Authors: Tang, Rui | Taguchi, Kaishi | Nishihara, Hirotomo | Ishii, Takafumi | Morallon, Emilia | Cazorla-Amorós, Diego | Asada, Toshihiro | Kobayashi, Naoya | Muramatsue, Yasuji | Kyotania, Takashi
Research Group/s: Electrocatálisis y Electroquímica de Polímeros | Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Carbon corrosion | Positive electrodes | Supercapacitors
Knowledge Area: Química Física | Química Inorgánica
Issue Date: 1-Mar-2019
Publisher: Royal Society of Chemistry
Citation: Journal of Materials Chemistry A. 2019, 7: 7480-7488. doi:10.1039/C8TA11005K
Abstract: While activated carbons are used as electrode materials in commercial supercapacitors, they are not stable under high voltage operation especially at a positive-electrode side, and this limits the working voltage of supercapacitors to about 2.8 V in organic electrolytes. Thus, revealing the specific carbon chemical structures causing the corrosion is of great significance to come up with ideas of avoiding the corrosion reactions and eventually to achieve high energy density by expanding the working voltage. In this work, a variety of carbon materials are analyzed with many characterization techniques such as X-ray diffraction, Raman spectroscopy, N2 adsorption, magnetic susceptibility measurement, and temperature programmed desorption up to 1800 °C, to find out the origin of corrosion reactions in an organic electrolyte. While carbon crystallinity and porosity are not directly related to the positive-electrode corrosion, a good correlation is found between the corrosion charge and the number of carbon edge sites terminated by H and oxygen-functional groups which are decomposed and release CO. It is thus concluded that the H-terminated edge sites, phenol, ether and carbonyl groups are electroactive sites for the carbon materials used in the positive electrode of supercapacitors.
Sponsor: This work was supported by JSPS KAKENHI (grant no. 15H01999 and 17H01042); the Dynamic Alliance for Open Innovation Bridging Human, Environment, and Materials program; and the Network Joint Research Centre for Materials and Devices. R. T. acknowledges the China Scholarship Council for the financial support. MINECO and FEDER (CTQ2015-66080-R MINECO/FEDER) are acknowledged for financial support.
ISSN: 2050-7488 (Print) | 2050-7496 (Online)
DOI: 10.1039/C8TA11005K
Language: eng
Type: info:eu-repo/semantics/article
Rights: © The Royal Society of Chemistry 2019
Peer Review: si
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