DMFC Catalyst Layer Prepared Using Arc-Soot Nano-Carbon by Dry-Squeegee Method and Its Impedance Analysis

Oke, Shinichiro; Izumi, Y.; Ikeda, Takashi; Uruno, Hikaru; Suda, Yoshiyuki; Takikawa, Hirofumi; Itoh, S.; Yamaura, Tatsuo; Ue, Hitoshi; Sakakibara, Tateki; Sugawara, Shuichi; Okawa, Takashi; Aoyagi, Nobuyoshi

doi:10.5796/electrochemistry.77.210

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…As for the MEA fabrication process, we have developed the dry-squeeze method to form a catalyst layer. 5) Briefly, PtRu-supported AcB and Pt-supported AcB, were respectively used as anode and cathode catalysts, and a CNB was used as an additive in the catalyst layers for improvement of electric conductivity. The catalyst and additive were thoroughly mixed and evenly laid on a carbon paper (anode: Toray Industries TGP-H-090, and cathode: SGL Carbon GDL35BA).…”

Section: Supporting Catalyst Metals and Fabrication Ofmentioning

confidence: 99%

“…The CNB content was 10%, which was determined by our previous experiments. 10) After dropping 5% Nafion solution (Sigma-Aldrich), an electrolyte, onto the catalyst/additive layer, this layer and Nafion115 (Sigma-Aldrich) were jointly hot-pressed at 2 MPa at 120 C in order that a three-phase interface, where catalysts on the carbon nanomaterial, methanol-water solution, and Nafion exist simultaneously, was formed. Protons and electrons are generated by methanol oxidation reaction on the surface of the anode catalyst metal (PtRu), and only protons can penetrate Nafion115 toward the cathode catalyst metal (Pt) to be reacted with oxygen and form water molecules.…”

Section: Supporting Catalyst Metals and Fabrication Ofmentioning

confidence: 99%

“…[1][2][3] We synthesized arc black (AcB) by arc discharge using graphite electrodes in N 2 gas and interestingly found that a carbon nano-balloon (CNB), a hollow capsule with graphite layers, was formed by heat treatment of the AcB. [4][5][6][7][8][9] In this study, we characterized the AcB and CNB by transmission electron microscopy, Raman spectroscopy, thermogravimetric analysis, and compressive resistivity measurement, and evaluated the performance of the direct methanol fuel cell (DMFC), in which the AcB and CNB were used as a catalyst support and material for the improvement of electric conductivity, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Arc Black and Carbon Nano Balloon by Arc Discharge and Their Application to a Fuel Cell

Ikeda

Kaida

Satou

et al. 2011

Jpn. J. Appl. Phys.

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Ba(Zr 0.2 Ti 0.8 )O 3 (BZT) and 2 mol% Mn additional doped BZT (Mn-BZT) thin films were deposited on Pt/Ti/SiO 2 /Si by the pulsed laser deposition (PLD) technique under the same growth conditions. X-ray diffraction scans showed that both films were polycrystalline and preferentially (1 1 1)-oriented, and an enhanced crystallization effect was obtained after Mn doping. The parallel-plate capacitors of Au/BZT/Pt and Au/Mn-BZT/Pt were prepared to investigate the electric properties, respectively. The remanent polarization and the coercive electric field for Mn-doped BZT film were both smaller than those of undoped BZT film. Furthermore, Mn-doped BZT film exhibited a higher dielectric constant of 460 at zero bias, larger dielectric tunability of 69.0% and lower dielectric loss of 5.0‰ under an applied electric field of 615 kV cm −1 than those of undoped BZT film. The figure of merit for preferentially (1 1 1)-oriented BZT thin film was greatly enhanced from 94 to 138 by Mn doping. The enhanced dielectric behaviour by Mn doping could be mainly attributed to the decrease in electron concentration and oxygen vacancies and the reorientation of the defect complex.

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Section: Supporting Catalyst Metals and Fabrication Ofmentioning

confidence: 99%

Section: Supporting Catalyst Metals and Fabrication Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of Arc Black and Carbon Nano Balloon by Arc Discharge and Their Application to a Fuel Cell

Ikeda

Kaida

Satou

et al. 2011

Jpn. J. Appl. Phys.

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“…In our laboratory, we have succeeded in the large-scale synthesis of carbon particles and nanocoils in gram quantities, and investigated their applications. They are expected to find use in field electron emitters [2,3], super capacitors [4,5], and fuel cells [1,6,7].…”

Section: Introductionmentioning

confidence: 99%

Use of Carbon Nanomaterials as a Catalyst Support in Fuel Cells

Suda

2016

MSF

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PtRu or Pt catalysts were supported on four types of carbon nanomaterials with different shapes, sizes, and graphitic and electrical properties, and their resulting catalytic activities were evaluated by electrochemical methods. The carbon nanomaterials used included two types of particles: Arc Black (AcB) and Vulcan XC-72R (Vulcan), and two types of nanofibers: carbon nanocoils (CNC) and VGCF-X. Pt and Ru were loaded onto the nanomaterials by a reduction method using sodium borohydride. Transmission electron microscopy and X-ray diffraction (XRD) revealed the PtRu catalyst particles to be 4–6 nm in diameters. The shifts in the Pt (111) XRD peaks of the catalysts on CNC and VGCF-X were larger than those on AcB and Vulcan, indicating a higher degree of alloying between Pt and Ru. The diameters of the CNC-supported Pt and PtRu catalyst particles had the narrowest distributions and were constant within the range of catalyst loadings investigated. Electrochemical studies of the catalysts during methanol oxidation were carried out using cyclic voltammetry. The catalyst particles supported on CNC and VGCF-X exhibited higher catalytic activity than those on AcB and Vulcan. The effect of the surface area of the carbon nanomaterials on the catalytic activity is discussed.

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“…AcB was synthesized by arc discharge. CNB was produced by heating the prepared AcB at 2400 C. [8][9][10][11][12] In our previous experiment, AcB showed a higher specific capacitance than CNB. 13) However, when the charge-discharge speed was high, the specific capacitance of CNB became higher than that of AcB.…”

Section: Introductionmentioning

confidence: 99%

Improvement in the Characteristics of Electric Double Layer Capacitor Using a Mixture of Arc Black and Carbon Nanoballoon

Okabe

Izumi

Suda

et al. 2013

Jpn. J. Appl. Phys.

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Carbon nanomaterials with different structures were mixed for an electric double layer capacitor (EDLC) electrode. We used two kinds of carbon nanomaterial: arc black (AcB) and a carbon nanoballoon (CNB). Arc black was synthesized by arc discharge. CNB was produced by heating the prepared AcB at 2400 °C. AcB mostly consists of an amorphous component and has a large specific surface area. On the other hand, CNB has a graphitic surface and a high conductivity. To utilize their characteristics, AcB and CNB were used as the main materials of the EDLC electrode in weight ratios of 1:1, 2:1, and 1:2. The obtained EDLC electrode was filled with 1 M H2SO4 as the electrolyte. As a result, by mixing AcB and CNB, both the power and energy densities became higher than those of AcB or CNB alone. The EDLC mixed in 1:1 weight ratio of AcB and CNB showed the highest performance, with a higher electric power density than activated carbon (AC).

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DMFC Catalyst Layer Prepared Using Arc-Soot Nano-Carbon by Dry-Squeegee Method and Its Impedance Analysis

Cited by 6 publications

References 11 publications

Preparation of Arc Black and Carbon Nano Balloon by Arc Discharge and Their Application to a Fuel Cell

Preparation of Arc Black and Carbon Nano Balloon by Arc Discharge and Their Application to a Fuel Cell

Use of Carbon Nanomaterials as a Catalyst Support in Fuel Cells

Improvement in the Characteristics of Electric Double Layer Capacitor Using a Mixture of Arc Black and Carbon Nanoballoon

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