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Theoretical Model for Nanoporous Carbon Supercapacitors


  • This research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL) and by the Division of Materials Sciences and Engineering, U.S. Department of Energy under Contract No. DEAC05-00OR22725 with UT-Battelle, LLC at ORNL. We are indebted to Dr. Sheng Dai, Dr. Nancy J. Dudney, and Prof. Dr. Miklos Kertesz for their helpful discussions on pore shape, electrochemical aspects, and charge transfer from molecules inside nanotubes to nanotubes, respectively.


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Importance of pore curvature: A theoretical model is proposed for nanoporous carbon supercapacitors to replace the commonly used one for an electric double-layer capacitor (EDLC) on the basis of an electric double-cylinder capacitor (EDCC) for mesopores, which becomes an electric wire-in-cylinder capacitor (EWCC) for micropores (see picture; left to right: decreasing pore size). This model explains the experimental data in various pore ranges, showing the significance of pore curvature.