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Capacitance with Different Electrode Surface Topology

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Encyclopedia of Ionic Liquids

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Introduction

This chapter discusses simulation works on the topic of capacitance dependence on voltage and electrode surface structure. Flat electrode surfaces generated a weak dependence of DC versus voltage, albeit the typical bell-shaped or U-shaped features from basic theory were noticeable. In contrast, rough electrodes generated sharp peaks in DC at potentials where surface was abruptly depopulated of counter-ions. Surface curvature and roughness can significantly increase the integral electrode capacitance and the stored energy. Nanoporous electrodes can further increase the capacitances if pore widths match the size of the ions, or pores have rough patterns on their surface.

The amount of energy stored by the electric double layer capacitors (EDLCs) or supercapacitors strongly depends on the ability of electrolyte to accommodate charge separation in the narrow (few nanometers wide) layer near the electrode surface or inside electrode nanopores. For open-structure electrodes...

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Author information

Authors and Affiliations

  1. Department of Materials Science & Engineering, The University of Utah, Salt Lake City, UT, USA

    Dmitry Bedrov & Jenel Vatamanu

Authors
  1. Dmitry Bedrov
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  2. Jenel Vatamanu
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Corresponding author

Correspondence to Jenel Vatamanu .

Editor information

Editors and Affiliations

  1. Institute of Process Engineering, Chinese Academy of Science, Institute of Process Engineering, Beijing, China

    Suojiang Zhang

Section Editor information

  1. Huazhong University of Science and Technology (HUST), Wuhan, China

    Guang Feng

  2. Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, USA

    Peter T. Cummings

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Bedrov, D., Vatamanu, J. (2021). Capacitance with Different Electrode Surface Topology. In: Zhang, S. (eds) Encyclopedia of Ionic Liquids. Springer, Singapore. https://doi.org/10.1007/978-981-10-6739-6_16-1

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  • DOI: https://doi.org/10.1007/978-981-10-6739-6_16-1

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  • Print ISBN: 978-981-10-6739-6

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