Catalytic Synthesis of Carbon Nanotube and Nanofilament Over Oxidized Diamond-Supported Catalysts

Nakagawa, Kiyoharu; Toriyama, Takahiro; Tsujino, Gai; Ando, Toshihiro; Oda, Hirokazu

doi:10.1149/05020.0001ecst

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…Oxidized diamond (Diamond Innovations Co., Ltd.) was used as the catalyst supports. Oxidized diamond has oxygen-containing functional groups arranged regularly, so that nano metal particles can a highly dispersed on it (8). Therefore, oxidized diamondsupported Pd catalyst (Pd loading: 5 wt%) for CNFs synthesis was prepared by the metal nano-colloidal method (9).…”

Section: Preparation Of Catalyst For Synthesis Cnfsmentioning

confidence: 99%

Development of Negative Electrode for Calcium Ion Battery Using Marimo Nano Carbon

Nishimura

Nakagawa

2020

Meet. Abstr.

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Lithium-ion batteries (LIBs) are used in various fields due to their high energy density and high cycle characteristics. In general, graphite materials are used for the negative electrode materials for lithium-ion batteries (LIBs). However, since the amount of Li ion that can be stored in the graphite material of the negative electrode is approaching the theoretical value for LIBs, a significant increase in capacity cannot be expected. Calcium ion batteries (CIBs) use Ca ion as charge carriers. Therefore, they can be expected to have twice the capacity of LIBs. In LIBs, charge and discharge mechanism occurs by intercalation and deintercalation of Li ion into graphite layers. However, Ca ion are poor in reactivity, intercalation and deintercalation of Ca ion do not occur in the graphite negative electrode, and charge and discharge capacity cannot be obtained. For this reason, we used Marimo Nano Carbon (MNC) as a new negative electrode material. MNC is an aggregate of carbon nano filaments (CNF). CNF has a layered structure similar to graphite and also has amazing electronic properties and many other unique properties. This CNF has coin-stacked structure in which graphene layers are stacked, and the edge surface is exposed. Hence, we expected that MNC negative electrode would react with less reactive Ca ions and indicated larger charge / discharge capacity than that of the graphite negative electrode. In this study, we evaluated MNC negative electrode performance. For MNC synthesis, nano metal particles carried on oxidized diamond were used. Oxidized diamond has oxygen-containing functional groups arranged regularly. Thus, nano metal particles are a highly dispersed on it. Pd metal was used for carried metal. Pd metal could synthesized CNF having coin-stacked structures. Pd metal was carried on oxidized diamond by metal nano-colloidal method. C2H4 as a feedstock for CNF was used, and MNC was synthesized by the chemical vapor deposition (CVD) method. When MNC was used as the negative electrode material, the charge and discharge capacity was larger than that of the graphite negative electrode. In addition, the intercalation of Ca ions between the graphene layers was confirmed.

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Section: Preparation Of Catalyst For Synthesis Cnfsmentioning

confidence: 99%

Development of Negative Electrode for Calcium Ion Battery Using Marimo Nano Carbon

Nishimura

Nakagawa

2020

Meet. Abstr.

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“…For these reasons, CNFs have many advantages for use as Li-ion battery anodes. To synthesize CNFs, oxidized diamond was chosen as the catalyst support [8] . Its surface is easily oxidized by oxidative acids and oxygen at elevated temperatures to form ethers, which further react to form carbonyls.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical properties of various carbon nanofilaments for use as Li-ion battery anodes

Muraoka

Tsujino

Nakagawa

et al. 2016

Trans. Mat. Res. Soc. Japan

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Carbon nanotubes (CNTs) and carbon nanofilaments (CNFs) have attracted considerable interest in industry and many other fields such as for their use in electronic devices. In this study, CNFs were synthesized by decomposition of ethylene over Pd-and Ni-loaded oxidized diamond catalysts using a fluidized-bed reactor. We examined the effects of various internal structures on Li-ion battery anode properties. Electrochemical measurements indicated that CNF anodes displayed near the theoretical discharge capacity of graphite intercalation compounds (372 mAh/g) as well as high cycle retention. CNF anodes were thus found to be appropriate materials for the use in Li-ion batteries.

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Synthesis of various nano carbon filaments by CVD over catalysts loaded on a metal oxides composite

Tsujino

Ota

Nishitani‐Gamo

et al. 2015

TANSO

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Carbon nanotubes (CNTs) and nanofilaments (CNFs) were synthesized by the decomposition of ethylene using oxidized diamond-supported catalysts at a relatively mild temperature. Oxidized diamond is proposed as a novel support material for the catalytic synthesis of CNTs and CNFs. We focused on the inner structure of the CNTs which were synthesized using Ni, Co, Fe, Ni-Fe, Co-Fe, and Ni-Co-loaded oxidized diamond catalysts. The oxidation state of loaded metals in bimetallic catalysts played an important role in producing a more uniform internal structure of the synthesized CNTs. CNFs synthesized over bimetal-loaded oxidized diamond catalysts had different internal structures and fiber axis/graphene layer angles.

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Catalytic Synthesis of Carbon Nanotube and Nanofilament Over Oxidized Diamond-Supported Catalysts

Cited by 4 publications

References 10 publications

Development of Negative Electrode for Calcium Ion Battery Using Marimo Nano Carbon

Development of Negative Electrode for Calcium Ion Battery Using Marimo Nano Carbon

Electrochemical properties of various carbon nanofilaments for use as Li-ion battery anodes

Synthesis of various nano carbon filaments by CVD over catalysts loaded on a metal oxides composite

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