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Electrochemical mechanism of ion current rectification of polyelectrolyte gel diodes

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  • Tetsuya Yamamoto

    (Center of Soft Matter Physics and its Applications, School of Chemistry and Environment, Beihang University
    Kavli Institute for Theoretical Physics China
    Tokyo Institute of Technology)

  • Masao Doi

    (Center of Soft Matter Physics and its Applications, School of Chemistry and Environment, Beihang University)

Abstract

Polyelectrolyte gel diodes that are double layers of two oppositely charged polyelectrolyte gels, sandwiched by two symmetric electrodes, are emergent ionic devices. These diodes are designed to rectify ion currents with a physical mechanism that is analogous to conventional semiconductor diodes—the asymmetry in the permeability of ions across the interfaces between the two oppositely charged gels. Here we show that polyelectrolyte gel diodes indeed rectify steady currents with a physical mechanism that is very different from conventional diodes by using a simple electrochemical model; electric currents are limited by electrochemical reactions that are driven by potential drops at electrodes and these potential drops markedly change with changing the direction of applied voltages due to the redistribution of non-reactive counterions, leading to rectified ion currents. This concept is relatively generic and thus may provide insight in the physics of analogous ionic and biomimetic systems that show electrochemical reactions.

Suggested Citation

  • Tetsuya Yamamoto & Masao Doi, 2014. "Electrochemical mechanism of ion current rectification of polyelectrolyte gel diodes," Nature Communications, Nature, vol. 5(1), pages 1-8, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5162
    DOI: 10.1038/ncomms5162
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