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Diamond and Related Materialsに研究成果が掲載されました

2021/08/20

Benzene hydrogenation activities of Ni catalyst supported on N- and B-doped carbons https://www.sciencedirect.com/science/article/pii/S0925963521003137?via%3Dihub A catalyst support can improve the catalytic activity of metal catalysts, and this phenomenon is well known as the support effect. The effective use of this support effect is considered important for improving catalytic activity. However, the factors affecting this phenomenon are complex. It is, therefore, important to understand the interaction between the support and metal catalyst as well as the surface characteristics of the supp...続きを読む »

RSC Advancesに研究成果が掲載されました

2021/05/24

Direct conversion of lignin to high-quality graphene-based materials via catalytic carbonization https://pubs.rsc.org/en/content/articlelanding/2021/RA/D1RA02491D#!divAbstract Methods for effectively utilizing lignin are necessary for the realization of a sustainable society. Herein, we report a method for directly converting lignin to graphene-based materials. Fe-supported lignin is prepared by dissolving lignin in an aqueous FeCl2 solution, followed by freeze drying. Graphene is then produced by catalytically carbonizing this Fe-supported lignin at 1200 °C. The characteristics of both the Fe...続きを読む »

Carbonに研究成果が掲載されました

2020/11/28

Quantitative analysis of the formation mechanism of tightly bound rubber by using carbon-coated alumina nanoparticles as a model filler https://www.sciencedirect.com/science/article/pii/S0008622320311532?via%3Dihub Using carbon-coated alumina nanoparticles as a model filler for styrene-butadiene rubber (SBR), rubber composites with different carbon surface chemistry were prepared and the bound rubber thus formed in each composite was analyzed in relation to the carbon surface chemistry. The present approach provides quantitative understanding of the rubber-carbon interface at the molecular lev...続きを読む »

TANSOに研究成果が掲載されました

2019/11/15

カーボン表面の組成・構造と酸素還元活性 https://www.jstage.jst.go.jp/article/tanso/2019/290/2019_029007/_article/-char/ja/ This article reviews the influence of heteroatom doping and the formation of warped graphitic layers on the catalytic activity of carbons for the oxygen reduction reaction (ORR). The development of a non-platinum cathode catalyst is key for the practical use of polymer electrolyte fuel cells (PEFCs), and carbon-based ORR catalysts are receiving special attention. First, we consider studies on the enhanced ORR activity of carbons caused by heteroatom doping. The type of dopant has been extende...続きを読む »

ISIJ Internationalに研究成果が掲載されました

2019/08/15

Influence of Low-temperature Oxidation on Structure of Coke Making Coal https://www.jstage.jst.go.jp/article/isijinternational/59/8/59_ISIJINT-2018-808/_article Self-exothermic reaction of coal is initiated by the reaction of coal in a pile with oxygen in the air to be oxidized. Then, the heat generated by the oxidation promotes further oxidation, resulting in ignition. In order to prevent this phenomenon, it is necessary to understand the initial stage of oxidation of coal in the condition of heat-accumulation. Conventionally, there are very few researches to understand the early stage of coa...続きを読む »

Science Advancesに研究成果が掲載されました

2018/03/29

Critical advancements in achieving high power and stable nonprecious metal catalyst–based MEAs for real-world proton exchange membrane fuel cell applications Dustin Banham, Takeaki Kishimoto, Yingjie Zhou, Tetsutaro Sato, Kyoung Bai, Jun-ichi Ozaki, Yasuo Imashiro, Siyu Ye Article Despite great progress in the development of nonprecious metal catalysts (NPMCs) over the past several decades, the performance and stability of these promising catalysts have not yet achieved commercial readiness for proton exchange membrane fuel cells (PEMFCs). Through rational design of the cathode catalyst layer ...続きを読む »

Carbonに研究成果が掲載されました

2017/10/02

Analyses of trace amounts of edge sites in natural graphite, synthetic graphite and high-temperature treated coke for the understanding of their carbon molecular structures Ishii, T., Kaburagi, Y., Yoshida, A., Hishiyama, Y., Oka, H., Setoyama, N., Ozaki, J., Kyotani, T. Article Trace amounts of edge sites in natural graphite, synthetic graphite and high-temperature treated coke are quantitatively analyzed from the numbers of hydrogen atoms and oxygen-containing functional groups at carbon edge sites. For the analysis of hydrogen content, a new analytical technique is developed. The oxygen-con...続きを読む »

International Journal of Hydrogen Energyに研究成果が掲載されました

2017/05/25

Enhanced catalytic activity of nanoshell carbon co-doped with boron and nitrogen in the oxygen reduction reaction Takafumi Ishii, Takuya Maie, Naofumi Kimura, Yuki Kobori, Yasuo Imashiro and Jun-ichi Ozaki Article The use of carbon cathode catalysts in polymer electrolyte fuel cells instead of the current platinum catalysts is attracting increasing attention. We claim that two factors are important for enhancing the activity of carbon cathode catalysts in the oxygen reduction reaction (ORR): the formation of a nanoshell structure and co-doping with boron and nitrogen. Herein, we investigate th...続きを読む »

Carbonに研究成果が掲載されました

2017/02/13

Synergistically enhanced oxygen reduction activity of iron-based nanoshell carbons by copper incorporation Takafumi Ishii, Takuya Maie, Mikiya Hamano, Takeaki Kishimoto, Mayumi Mizushiri, Yasuo Imashiro and Jun-ichi Ozaki Article Abstract This study reports the synergistic improvement of the oxygen reduction reaction (ORR) activity of a carbon catalyst prepared from a phenol–formaldehyde resin by simultaneous incorporation of Cu and Fe phthalocyanines. This carbon catalyst exhibited higher ORR activities than those prepared with either Cu or Fe phthalocyanines, with an approx. 28-fold maximum ...続きを読む »

ACS OMEGAに研究成果が掲載されました

2016/10/28

Single-Step Synthesis of W2C Nanoparticle-Dispersed Carbon Electrocatalysts for Hydrogen Evolution Reactions Utilizing Phosphate Groups on Carbon Edge Sites Takafumi Ishii, Keita Yamada, Noriko Osuga, Yasuo Imashiro and Jun-ichi Ozaki Article Link (Open access)...続きを読む »