Electrochemical characterization of carbon felt electrodes for bulk electrolysis and for biocatalyst-assisted electrolysis

被引:35
作者
Kato, K [1 ]
Kano, K [1 ]
Ikeda, T [1 ]
机构
[1] Kyoto Univ, Grad Sch Agr, Div Appl Life Sci, Kyoto 6068502, Japan
关键词
D O I
10.1149/1.1393376
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A sheet of carbon felt employed as an electrode exhibits characteristic voltammteric waves for the electrolysis of solutions reflecting a three-dimensional fiber structure of the electrode, in which the solutions both inside and outside the felt electrode undergo electrolysis. The electrolysis behavior can be characterized by three parameters: A(out) for the electrolysis of the outside solution, and l and A(in) for that of inside solution. A(out) expresses the effective outer surface area, and l and A(in) the average distance between the carbon fibers and the effective total surface area of the fibers constituting the felt electrode, respectively. it is shown that chronoamperometry provides a useful means of determining these parameter values. The value of A(in)/m, 0.33 m(2)/g, (m is the mass of the felt electrode) is in the range of the reported values for the surface area per unit weight of carbon felts, and l is in fair agreement with the average distance between the fibers measured with an optical microscope, it is shown that A(in) and l are important parameters determining the rate of bull; electrolysis of a eh en volume of stirred solution, and that A(in) is a key parameter determining the magnitude of the current for biocatalyst-assisted electrolysis. (C) 2000 The Electrochemical Society. S0013-4651(99)08-095-7. All rights reserved.
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页码:1449 / 1453
页数:5
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