High power electric double-layer capacitors based on carbon with ordered 2 nm pores

ORAL

Abstract

High surface area carbons find numerous applications in energy storage. In this project we were interested in investigating how we could improve the capacity retention, frequency response and power characteristics of electric double-layer capacitor (EDLC) electrodes if we employ high surface area porous carbon particles with aligned nanopores. We synthesized porous carbon replicas of zeolite Y particles using low-pressure chemical vapor deposition of carbon on a zeolite Y template, which was subsequently removed. X-Ray diffraction revealed aligned and ordered pores in the produced carbon, while scanning electron microscopy confirmed the conformation of shape during the templating process. Transmission electron microscopy showed the very uniform microstructure of the produced carbon. The zeolite-templated carbon was used as electrodes in EDLC's and showed exceptional energy storage characteristics. At low current densities the specific capacitance exceeded 200 F/g, among the highest values reported. The specific capacitance in excess of 100 F/g could be maintained at frequencies as high as 10 Hz and current densities as high as 20 A/g, which is unprecedented for carbon materials.

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Authors

  • Adam Kajdos

    Georgia Institute of Technology

  • Milind Purohit

    Univ of South Carolina, Benedict College, Sc 29204, Univ. South Carolina, Benedict College, Univ South Carolina, GA Tech, Central Microscopy Research Facility, University of Iowa, Iowa City, Iowa 52242, USA, Department of Chemistry, University of Sri Jayewardenepura, Nugegoda, Sri Lanka, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL 35294, Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294, College of William \& Mary, Harvard University, Benedict College, SC 29204, Massachusetts Institute of Technology, University of Applied Science, Bielefeld, Germany, Francis Marion University, Physics Dept., Emory University, Emory University, Formerly Emory University, currently UCLA, Physics Department, Georgia State University, Univ. of Georgia, Dept. of Chemistry, Universidad Nacional de Quilmes, Argentina, Pr, Dr, Derpartment of Physics, Florida A\&M University, Tallahassee, FL-32307, Department of Physics, Emory University, Georgia Institute of Technology, Naval Research Laboratory, University of Alabama, Tsinghua University, Lawrence Berkeley National Laboratory, Vanderbilt University, Jagellonian Univ., Univ. of Bonn, North Carolina A\&T State Univ., North Carolina Central Univ., Duke Univ. and TUNL, Georgia State University, Dept of Physics, Emory University, Cell Biology Department, Emory University, Physics Department, Emory University, University of South Carolina