In Situ Measurement of Electrosorption-Induced Deformation Reveals the Importance of Micropores in Hierarchical Carbons

Christian Koczwara, Simon Rumswinkel, Christian Prehal, Nicolas Jäckel, Michael S. Elsässer, Heinz Amenitsch, Volker Presser, Nicola Hüsing, Oskar Paris

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Dimensional changes in carbon-based supercapacitor electrodes were investigated using a combination of electrochemical dilatometry and in situ small-angle X-ray scattering. A novel hierarchical carbon material with ordered mesoporosity was synthesized, providing the unique possibility to track electrode expansion and shrinkage on the nanometer scale and the macroscopic scale simultaneously. Two carbons with similar mesopore structure but different amounts of micropores were investigated, employing two different aqueous electrolytes. The strain of the electrodes was always positive, but asymmetric with respect to positive and negative applied voltages. The asymmetry strongly increased with increasing microporosity, giving hints to the possible physical origin of electrosorption induced pore swelling.

Original languageEnglish
Pages (from-to)23319-23324
Number of pages6
JournalACS Applied Materials & Interfaces
Volume9
Issue number28
DOIs
Publication statusPublished - 19 Jul 2017

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Keywords

  • dilatometry
  • electrical double-layer capacitor
  • in situ
  • ordered porous carbon
  • small-angle X-ray scattering
  • supercapacitor
  • swelling

ASJC Scopus subject areas

  • Materials Science(all)

Fields of Expertise

  • Advanced Materials Science

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