Influences of Both Carbon Supports and Heat‐Treatment of Supported Catalyst on Electrochemical Oxidation of Methanol

Uchida, Makoto; Aoyama, Yuko; Tanabe, Mieko; Yanagihara, N.; Eda, Nobuo; Ohta, Akira

doi:10.1149/1.2050055

Cited by 167 publications

(64 citation statements)

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“…The most often utilised catalyst support materials for PEMFC are carbon blacks, whose properties and suitability for PEMFCs were examined in a number of publications ( [1] and references therein, [4,5]). In search of better catalyst supports, various novel carbon materials, such as carbon nanotubes and nanofibers [6], ordered mesoporous carbons [7,8] and disordered mesoporous carbons, such as Sibunit [9,10], were recently evaluated in the fuel cells.…”

Section: Introductionmentioning

confidence: 99%

Sibunit Carbon‐Based Cathodes for Proton‐Exchange‐Membrane Fuel Cells

et al. 2009

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Preparation, characterisation and evaluation of a novel cathode catalyst for H2/O2 PEMFC – 40 wt.‐% Pt/Sibunit 1562P carbon – is presented. The performance of the cathodes based on the latter material is compared to that of a widely used commercially available reference material – 40 wt.‐% Pt/Vulcan XC 72R – Hispec 4000 (Johnson Matthey, UK). It has been found that the mass activity of the 40 wt.‐% Pt/Sibunit 1562P catalyst exceeds that of a commercial benchmark by a factor of 2 due to a better dispersion of the Pt metal realised in the Sibunit – supported catalyst. Mass transport properties of the two catalysts studied are virtually equal.

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Section: Introductionmentioning

confidence: 99%

Sibunit Carbon‐Based Cathodes for Proton‐Exchange‐Membrane Fuel Cells

et al. 2009

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“…In this regard, an important role is played by the carbon support. In fact, the carbon support should have a high percentage of mesopores in the 20-40 nm region to provide a high accessible surface area to catalyst and to the monomeric units of the Nafion ionomer to boost the diffusion of chemical species [33][34][35]. The influence of both porosity and texture of the carbon support have influence on mass transport losses.…”

Section: Influence Of the Carbon Support On The Catalytic Activity Ofmentioning

confidence: 99%

“…It has been observed for Pt/C catalysts, synthesized using the sulphite-metal complex method, that platinum particles size decreased with increasing the specific surface area of the carbon black [34]. Instead, when the metal deposition on the carbon support is performed by impregnation methods, the specific surface area of the carbon support seems to have only a little effect on Pt dispersion [53].…”

Section: Carbon Blacksmentioning

confidence: 99%

Carbon-Based Nanomaterials

Lavacchi

Vizza

2013

Nanostructure Science and Technology

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In fuel cells both the anode and cathode electrocatalysts are generally composed of nanosized metal particles which are supported on high surface area materials. The electrochemically active surface area (EASA), of catalysts used in low temperature fuel cells, such as polymer electrolyte membrane fuel cells (PEMFC, fed with hydrogen), direct alcohol fuel cells (DAFCs, alcohols: ethanol, methanol, polyalcohols), and direct formic acid fuel cells (DFAFC), has been found to be greatly enhanced when high surface area carbon-based materials are used as the support. As described in detail in Chap. 3, at the anode of a PEMFC dihydrogen is oxidized yielding protons and electrons. The protons pass through the cation exchange membrane toward the cathode where they are used in the reduction of oxygen to water together with the electrons arriving from the anode. The use of an anionexchange polymeric membrane as electrolyte, i.e., a membrane which allows only negative charges to pass, favors the production of negative ions, in this case OH -, in the process of oxygen reduction at the cathode, while the overall electrochemical process is left unvaried, as well as the reversible voltage of the cell. In PEMFCs, the polymeric electrolyte is generally Nafion Ò , a proton-exchange fluorinated membrane, about 50-200 lm thick. This withholds negatively charged ions (usually sulfonate groups -SO 3 -) covalently bonded to the polymeric backbone and therefore allows the passage of protons. Electrons are therefore forced to flow through the outer circuit. Nafion Ò , like other proton-exchange polymeric membranes, is most efficient when it works between 70 and 100°C, thus limiting the functionality of PEMFCs to low temperature operation.In DAFCs at the anode alcohols are oxidized to yield protons, electrons, and CO 2 or carboxylates, depending on the nature of the alcohol used as a fuel, while the cathode process is wholly similar to the one that takes place in PEMFCs.The most important component of a fuel cell is the membrane electrode assembly (MEA) that is composed of a catalytic layer where the electrochemical reactions occur, a diffusion layer providing access to the fuel and oxygen to the catalytic layer and a membrane where ions flow from one electrode to the other.

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“…Wu et al [21] reported that electrocatalytic efficiency of Pt nano particles also depends on the supporting matrix. Generally carbon and carbon-based materials are used for supporting catalyst particles [22][23][24][25][26][27][28][29][30]. A thin film of electronically conducting polymer (CP) acts as a good dispersing material for Pt nanoparticles [31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Electrooxidation of formic acid at platinum nanoclusters electrodeposited on PEDOT coated carbon paper electrode

2011

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Nanoclusters of Pt were electrochemically deposited on a conducting polymer, namely, poly(3,4-ethylenedioxythiophene) (PEDOT), which was also electrochemically deposited on carbon paper current collector. PEDOT facilitated uniform distribution of Pt nanoclusters, when compared with Pt electrodeposition on bare carbon paper substrate. Spectroscopy data indicated absence of any interaction between PEDOT and Pt. The electrochemically active surface area as measured from carbon monoxide adsorption followed by its oxidation was several times greater for Pt-PEDOT/C electrode in comparison with Pt/C electrode. The catalytic activity of Pt-PEDOT/C electrode for electrooxidation of formic acid was significantly greater than that of Pt/C electrode. Amperometry data suggested that the electrodes were stable for continuous oxidation of HCOOH.

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Influences of Both Carbon Supports and Heat‐Treatment of Supported Catalyst on Electrochemical Oxidation of Methanol

Cited by 167 publications

References 0 publications

Sibunit Carbon‐Based Cathodes for Proton‐Exchange‐Membrane Fuel Cells

Sibunit Carbon‐Based Cathodes for Proton‐Exchange‐Membrane Fuel Cells

Carbon-Based Nanomaterials

Electrooxidation of formic acid at platinum nanoclusters electrodeposited on PEDOT coated carbon paper electrode

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