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Characterization of Ag/Ag2SO4 system as reference electrode for in-situ electrochemical studies of advanced aqueous supercapacitors

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Abstract

Silver metal covered by Ag2SO4 was investigated as a reference electrode for flat three-electrode cells. The potential stability of the Ag/Ag2SO4 electrode in neutral aqueous solutions utilized as electrolytes for asymmetric high-voltage supercapacitors is reported. It was found that the potential drift and temperature coefficient of this reference electrode are insignificant. Its use as an alternative to the Ag/AgCl electrode enables one to avoid the contamination of the supporting electrolyte solution by Cl − anions, which are oxidized earlier than water molecules and other oxygen-containing anions (SO\(_{\mathrm {4}}^{\mathrm {2-}}\) or NO\(_{\mathrm {3}}^{\mathrm {-}}\)). Using the data obtained from three-electrode electrochemical measurements with the electrode in question, a graphene–carbon nanotube/MnO 2 supercapacitor cell accumulating 9.8 Wh kg −1 of specific energy at 1.75 V was built.

Silver sulfate reference electrode was developed to use as an alternative to the silver chloride one for application in studies of the supercapacitor electrode materials. Ag/Ag2SO4 electrode demonstrates excellent potential stability during the two-hour electrochemical measurements in open-circuit mode.

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Acknowledgements

The author thanks to Dr. S.A. Kirillov for his valuable advice in writing this work.

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Authors and Affiliations

  1. Joint Department of Electrochemical Energy Systems, 38A Vernadsky Ave, 03680, Kyiv, Ukraine

    DENYS G GROMADSKYI

  2. National Technical University of Ukraine “KPI”, 37 Peremohy Ave, 03056, Kyiv, Ukraine

    DENYS G GROMADSKYI

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  1. DENYS G GROMADSKYI
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Correspondence to DENYS G GROMADSKYI.

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GROMADSKYI, D.G. Characterization of Ag/Ag2SO4 system as reference electrode for in-situ electrochemical studies of advanced aqueous supercapacitors. J Chem Sci 128, 1011–1017 (2016). https://doi.org/10.1007/s12039-016-1084-2

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  • DOI: https://doi.org/10.1007/s12039-016-1084-2

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