巻号一覧
2015 巻 (2015)
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2015 巻, 268 号
選択された号の論文の9件中1～9を表示しています
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解説
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Rüdiger Schweiss, Oswin Öttinger原稿種別: Review Paper
2015 年 2015 巻 268 号 p. 131-134
発行日: 2015/06/15
公開日: 2015/07/15
ジャーナル フリーThis paper summarizes recent work at the SGL group on the versatility of different carbon materials (carbon blacks, graphite, carbon nanotubes) used as functional components in the micro-porous layer (MPL) of gas diffusion layers (GDL) for proton exchange membrane fuel cells (PEMFCs). The properties of MPL carbon materials are shown to have significant effects on the water management of PEMFCs. Multiwall carbon nanotubes significantly improve the GDL conductivity and their combination with graphite or carbon blacks allows for a GDL optimization for either dry (graphite-containing MPL) or wet (acetylene black-based MPL) operating conditions.抄録全体を表示PDF形式でダウンロード (450K)
技術報告
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岩下 哲雄原稿種別: 技術報告
2015 年 2015 巻 268 号 p. 135-137
発行日: 2015/06/15
公開日: 2015/07/15
ジャーナル フリーA device that simultaneously measures the dimensional changes of artificial graphite due to thermal expansion by two methods, contact and non-contact, has been developed. The contact method uses high-density isotropic graphite as a reference material, measurement jigs and a heater in electric furnace. The latter used a laser micro-gauge. An accurate measurement of the linear thermal expansion and the coefficient of thermal expansion at temperatures as high as 2400 °C could be made by the device using these two complementary methods.抄録全体を表示PDF形式でダウンロード (2458K)
解説
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持田 勲, 尹 聖昊, 宮脇 仁原稿種別: 解説
2015 年 2015 巻 268 号 p. 138-144
発行日: 2015/06/15
公開日: 2015/07/15
ジャーナル 認証ありTraditional carbon materials which have a long history of industrial importance have been competitive products in Japan for the last 30 years. Nevertheless, their research and development have recently been hardly discussed in academic communities, being overwhelmed by modern nanocarbons. Traditional carbon materials which include metallurgical cokes, activated carbons, and carbon blacks are still dominant in industry, bringing profits in Japan from the international market. Rapidly developing countries in Asia are making great efforts to catch up with our carbon technologies. The traditional carbon materials have now a chance to be developed further based on advances acquired in nanocarbon science and technology. This paper overviews the current and possible future features of traditional carbons. The authors expect that dedicated efforts of the carbon community in the coming years will result in industrial profit and academic challenges.抄録全体を表示PDF形式でダウンロード (7127K) -
Sebastien Cahen, Mélissa Fauchard, Philippe Lagrange, Claire H&#x ...原稿種別: Review Paper
2015 年 2015 巻 268 号 p. 145-153
発行日: 2015/06/15
公開日: 2015/07/15
ジャーナル フリーPotassium-thallium, potassium-mercury, and potassium-gold alloys can be intercalated into graphite, leading to the formation of poly-layered ternary compounds. Different ways of synthesis are involved for the preparation of the corresponding Graphite Intercalation Compounds (GICs). The as-prepared bulk GICs are described in a comparative study, regarding their chemical formula, their formation mechanism, and their structural and superconducting properties. Analogies and differences are pointed out.抄録全体を表示PDF形式でダウンロード (899K)
論文
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Akihiro Yamashita, Toshiki Yoshida, Aki Hidaka, Tatsuya Oshima, Yoshin ...原稿種別: Research Paper
2015 年 2015 巻 268 号 p. 154-159
発行日: 2015/06/15
公開日: 2015/07/15
ジャーナル フリーMethane gas is attracting much attention as an environmentally friendly alternative to petroleum. We have developed a high-safety and low-cost method for methane gas storage on activated carbons (ACs) prepared from biomass waste, to enable methane gas to be used effectively and safely. The ACs were prepared by the chemical activation of lignin and crab shell biomass waste with K2CO3. The optimum activated pore structure was determined using N2 adsorption isotherms, to enable the preparation of ACs with high methane adsorption capacities. The adsorption capacities of the prepared ACs and that of a commercially available active carbon were compared based on their methane adsorption isotherms at 298 K. The AC prepared from a mixture of lignin and crab shells had a maximum specific surface area of 3119 m2 g-1. The methane adsorption capacities of the ACs were particularly influenced by their micropore volumes.抄録全体を表示PDF形式でダウンロード (593K)
技術報告
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佐藤 悠紀子, 塩田 伸二, 佐野 富美, 清水 由美, 大崎 弘貴, 西 陽子原稿種別: 技術報告
2015 年 2015 巻 268 号 p. 160-165
発行日: 2015/06/15
公開日: 2015/07/15
ジャーナル フリーThe weight loss of isotropic high-density graphite products as a result of oxidation was measured at different temperatures under a constant flow of dried air: at 550 °C for 24 h under an air flow of 4 L min-1, at 700 °C for 2.5 h under 4 L min-1, and at 1200 °C for 1 h under 2 L min-1. By observing the changes in the surface and cross-section of the specimen with oxidation, the weight loss is discussed in relation to the bulk density and whether a purification process was included during the graphite production. At 550 °C, oxidation even occurred inside the block and was markedly accelerated by the presence of metallic impurities, leaving small etch pits with a round cross-section. Weight loss on graphite products without a purification process was 10∼100 times larger than that on products after purification. The weight loss at 1200 °C could be related to the bulk density for all graphite samples, with or without purification.抄録全体を表示PDF形式でダウンロード (4366K) -
吉本 修, 岡田 雅樹, 太田 直人原稿種別: 技術報告
2015 年 2015 巻 268 号 p. 166-170
発行日: 2015/06/15
公開日: 2015/07/15
ジャーナル フリーA new direct heating apparatus was developed for measuring the relative electrical resistivity of graphite materials in the range from room temperature to 3000 °C. The temperature dependence of the relative resistivity of isotropic high-density graphite, extruded graphite and graphite sheets showed an initial decrease to a minimum at around 600 °C followed by a linear increase up to 3000 °C. The relative error of the resistivity ratio was determined to be 1.0% on average, and 3.1% at a maximum by using a standard graphite (RM8424) certificated by NIST. For a glass-like carbon, the relative resistivity decreased with increasing temperature up to 1500 °C.抄録全体を表示PDF形式でダウンロード (1257K)
学位論文紹介
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Structural control of zeolite-templated carbon and its application to electrochemical energy storage原稿種別: Recent Doctoral Thesis
2015 年 2015 巻 268 号 p. 173-174
発行日: 2015/06/15
公開日: 2015/07/15
ジャーナル 認証ありIn this thesis, zeolite-templated carbon (ZTC), which is a high-surface microporous carbon, is chosen as a starting material and its structural control to achieve high performance electrochemical capacitors (ECs) is investigated. ZTC is synthesized as a negative replica of zeolite Y template, and has an interesting carbon framework, i.e. buckybowl-like framework structure, containing a lot of edge sites. Two different approaches were examined on the structure modification of ZTC to realize a high-performance electrode material for ECs. The first approach, decreasing the edge sites of ZTC, was found not to be effective way. However, the resulting material, i.e., crosslinked-fullerene-like framework structure, is a new class of sp2-carbon based material, which is expected to future researches. The second approach, utilization of the large amount of reactive edge site, was revealed to be an interesting way to enhance the capacitance from a contribution of electrochemically-introduced functional group.抄録全体を表示PDF形式でダウンロード (217K)
レポート
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尾崎 純一原稿種別: レポート
2015 年 2015 巻 268 号 p. 176
発行日: 2015/06/15
公開日: 2015/07/15
ジャーナル 認証ありPDF形式でダウンロード (312K)
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