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An electrode material for an electric double layer capacitor having a carbon fiber as an essential material. The carbon fiber has a coaxial stacking morphology of truncated conical tubular graphene layers, and each of the truncated conical tubular graphene layers includes a hexagonal carbon layer. E

An electrode material for an electric double layer capacitor having a carbon fiber as an essential material. The carbon fiber has a coaxial stacking morphology of truncated conical tubular graphene layers, and each of the truncated conical tubular graphene layers includes a hexagonal carbon layer. Edges of the hexagonal carbon layer are exposed. The exposed edges of the hexagonal carbon layers have a high degree of activity and can be modified with functional groups such as --COOH, --CHO, or --OH. This enables use of the carbon fiber as the electrode material. The specific surface area of the surfaces on which the edges are exposed is extremely large, whereby a large-capacitance electric double layer capacitor can be formed.

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An electrode material for an electric double layer capacitor having a carbon fiber as an essential material. The carbon fiber has a coaxial stacking morphology of truncated conical tubular graphene layers, and each of the truncated conical tubular graphene layers includes a hexagonal carbon layer. E

An electrode material for an electric double layer capacitor having a carbon fiber as an essential material. The carbon fiber has a coaxial stacking morphology of truncated conical tubular graphene layers, and each of the truncated conical tubular graphene layers includes a hexagonal carbon layer. Edges of the hexagonal carbon layer are exposed. The exposed edges of the hexagonal carbon layers have a high degree of activity and can be modified with functional groups such as --COOH, --CHO, or --OH. This enables use of the carbon fiber as the electrode material. The specific surface area of the surfaces on which the edges are exposed is extremely large, whereby a large-capacitance electric double layer capacitor can be formed. 00, Moysan, III et al.; US-5639564, 19970600, Moysan, III et al.; US-5641579, 19970600, Moysan, III et al.; US-5648179, 19970700, Moysan, III et al.; US-5654108, 19970800, Moysan, III et al.; US-5667904, 19970900, Moysan, III et al.; US-5814415, 19980900, Moysan, III et al.; US-5824424, 19981000, Haneishi et al., 428/626; US-5948548, 19990900, Welty et al.; US-5985468, 19991100, Sugg et al.; US-5989730, 19991100, Sugg et al.; US-6004684, 19991200, Sugg et al.; US-6033790, 20000300, Welty et al.; US-6090490, 20000700, Mokerji; US-6096426, 20000800, Mokerji; US-6103381, 20000800, Mokerji; US-6132889, 20001000, Welty et al.; US-6143424, 20001100, Jonte et al.; US-6154311, 20001100, Simmons, Jr. et al.; US-6168242, 20010100, Mokerji; US-6242100, 20010600, Mokerji; US-6268060, 20010700, Mokerji; US-6399219, 20020600, Welty et al., 428/626