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Application of a quartz-crystal microbalance to measure ionic fluxes in microporous carbons for energy storage

Nature Materials volume 8, pages 872–875 (2009)Cite this article

Abstract

Fast ionic transport in microporous activated-carbon electrodes is a prerequisite for the effective energy storage in electrochemical supercapacitors1,2. However, the quartz-crystal microbalance3,4,5,6,7,8 (QCM), a direct tool to measure ionic fluxes in electrochemical systems, has not yet been used for studying transport phenomena in activated carbons (except for an early report on carbon nanotubes9). Conventional electroanalytical1 and suitable surface and structure-analysis techniques10,11,12 provide limited prognostic information on this matter. It has been demonstrated herein that the QCM response of typical microporous activated carbons can serve as a gravimetric probe of the concentration and compositional changes in their pore volume. This allowed direct monitoring of the ionic fluxes, which depended strongly on the electrode’s point of zero change, pore width, ion size and cycling conditions (polarization amplitude, charge/discharge depth and so on). The information on the nature of ionic fluxes into activated carbons is critical for promoting improvements in the performance of electrochemical supercapacitors, membrane technologies and (electro/bio)chemical sensors.

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Figure 1: Characterization of a microporous AC 1 and a non-porous, carbon-black electrode (as a reference) in an aqueous solution of 0.5 M CsCl.
Figure 2: Characterization of a microporous AC 1 electrode measured at gradually increasing potential amplitude of the voltammetric cycling.
Figure 3: Characterization of a modified microporous AC 1 electrode, measured sequentially in aqueous solutions of 0.5 M CsCl, LiCl, BaCl2 and TBACl.

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Acknowledgements

This work was supported by the GIF (German-Israel Foundation).

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Authors and Affiliations

  1. Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel

    Mikhael D. Levi, Grigory Salitra, Naomi Levy & Doron Aurbach

  2. Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany

    Joachim Maier

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  1. Mikhael D. Levi
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Correspondence to Doron Aurbach.

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Levi, M., Salitra, G., Levy, N. et al. Application of a quartz-crystal microbalance to measure ionic fluxes in microporous carbons for energy storage. Nature Mater 8, 872–875 (2009). https://doi.org/10.1038/nmat2559

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