Refined carbon material
a carbon material and carbon nanotube technology, applied in the field of carbon nanotubes, can solve the problem of reducing the interplanar spacing dsub>002 in high-temperature processing, and achieve the effect of preventing the explosive reaction of oxygen
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experimental example 1
[0091] As illustrated in FIG. 3, a petroleum-based needle coke was used as a raw material carbon. This was pretreated at 750° C. for 4 hours in an inert gas ambient, thus producing “calcined carbon”. Two parts by weight of KOH was added to the carbon. The mixture was processed at 800° C. for 4 hours to activate it. Then, the mixture was washed with water to remove the alkali components. Subsequently, the mixture was dried to thereby obtain nonporous carbon A. Then, 0.5 g and 1.5 g of powder of metal Co (31 G produced by Moritec Co., Ltd., Japan, having a purity of 99.8%; 200 mesh (less than 74 μm)) were added to two samples, respectively, of the nonporous carbon A each having a weight of 3 g. Each mixture was ground well with a pestle within a mortar to disperse the powder of metal Co in the nonporous carbon sufficiently.
[0092] Then, three boat-like containers made of alumina and each having a capacity of about 10 ml were prepared. The nonporous carbon in which the above-described ...
experimental example 2
[0106] Instead of the carbon materials used in Experimental Example 1, 2.5 g of commercially available phenolic resin-based, KOH-activated carbon MPS-20 (produced by Kansai Coke and Chemicals Co., Ltd., Japan) was used. Three samples each of which comprised 2.5 g of the activated carbon and to which 0.5 g of metal Co, 1.5 g of metal Co, and 0 g of metal Co (no addition) were added, respectively, were prepared, in the same way as in Experimental Example 1. Thus, refined carbon materials were derived.
[0107] The amount of active oxy-hydrogens (short and moderate relaxation time components) in each obtained, refined carbon material was measured by pulsed NMR, in the same way as in Experimental Example 1. Also, capacitors were assembled using the refined carbon materials as materials for activating carbon. Their charge-discharge characteristics were evaluated. The obtained results are shown in FIG. 8 and in Tables 1 and 2.
experimental example 3
[0108] Instead of the carbon materials used in Experimental Example 1, three kinds of refined carbon material to which 0.5 g of metal Co, 1.5 g of metal Co, and 0 g of metal Co (no addition) were added, respectively, were prepared using different carbon species of nonporous carbon B, in the same way as in Experimental Example 1. The amounts of active oxy-hydrogens (short and moderate relaxation time components) in each obtained, refined carbon material were measured by pulsed NMR in the same way as in Experimental Example 1. Furthermore, capacitors were assembled using the obtained, refined carbon materials as materials for activating the carbons. Their charge-discharge characteristics were evaluated. The obtained results are shown in FIG. 9 and in Tables 1 and 2.
[0109] The aforementioned nonporous carbons B were prepared by preheating petroleum-based needle coke available from a different supplier (produced by Koa Oil, Japan) at 750° C. for 4 hours to produce “calcined carbon”, ad...
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