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Fabrication and Basic Investigation of Flat Lignocellulosic Carbon Material for Self-Supporting Electrodes in Electric Double-Layer Capacitors

Published online by Cambridge University Press:  28 March 2013

Tsubasa Funabashi ,
Masamichi Sato ,
Masao Kitajima ,
Shuichi Shoji  and
Jun Mizuno
Tsubasa Funabashi
Affiliation:
School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan
Masamichi Sato
Affiliation:
Durarth Company, Tokorozawa, Saitama 359-1141, Japan
Masao Kitajima
Affiliation:
Waseda Research Institute for Science and Engineering, Shinjuku, Tokyo 169-8555, Japan
Shuichi Shoji
Affiliation:
School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan
Jun Mizuno
Affiliation:
Institute for Nanoscience and Nanotechnology, Waseda University, Shinjuku, Tokyo 162-0041, Japan
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Abstract

A novel flat, wood-based carbon material with heterogeneous pores, referred to as flat lignocellulosic carbon material (FLCM), was successfully fabricated by carbonizing samples of the softwood Picea jezoensis (Ezomatsu or Jezo spruce, a Japanese conifer). Simultaneous improvements of the specific surface area of the FLCM and the affinity of electric double-layer capacitor (EDLC) for electrolyte solvents were achieved by vacuum ultraviolet/ozone (VUV/O3) treatment. The specific surface area of the VUV/O3-treated FLCM showed a 50% increase over that of the original FLCM. The spectra measured by X-ray photoelectron spectroscopy (XPS) indicated that the number of O-C=O (carboxyl or ester) bonds increased, whereas the number of C-C bonds decreased. Additionally, the feasibility of using the FLCM as a self-supporting electrode in EDLCs was examined by measuring the electrochemical properties in a three-electrode system. The FLCM was confirmed as an appropriate self-supporting EDLC electrode material without warps and cracks. In addition, the FLCM can be used without any binder. Realization of FLCM-based EDLC electrodes with bendability, an area of several tens of square centimeters, and no risk of warp or crack formation, were indicated. Thus, FLCMs present a fascinating class of self-supporting carbon electrode materials for EDLCs.

Keywords

Ccarbonizationsurface reaction
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1497: Symposium K – Hierarchically Structured Materials for Energy Conversion and Storage , 2013 , mrsf12-1497-k06-22
Copyright
Copyright © Materials Research Society 2013

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