Mesoporous Carbon with Larger Pore Diameter as an Electrocatalyst Support for Methanol Oxidation

Raghuveer, V.; Manthiram, Arumugam

doi:10.1149/1.1792264

Cited by 63 publications

(40 citation statements)

References 21 publications

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“…Besides, suitable carbon supports for fuel cell catalysts have to combine a good electric conductivity to allow the flow of electrons, with a large and accessible surface area, and in this sense the mesoporous carbon displays an excellent electric conductivity [33] and, compared with the other supports, the highest surface area (about 400 m 2 g À1 ). Our results are coincident with those of Raghuveer and Manthiram [34] who concluded that the enhanced activity of Pt/ MC with respect to Pt/VC is due to the better dispersion and i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 3 7 ( 2 0 1 2 ) 1 7 9 1 0 e1 7 9 2 0 utilization of the Pt catalysts, which are originated from a higher surface area and the meso-porosity. Vengatesan et al [35] indicated also that the higher activity of the Pt/MC catalysts toward electrochemical reaction is due to the high dispersion of the Pt particles.…”

Section: Catalyst Characterizationsupporting

confidence: 92%

Deposition of Pt nanoparticles on different carbonaceous materials by using different preparation methods for PEMFC electrocatalysts

Veizaga

Fernández

Bruno

et al. 2012

International Journal of Hydrogen Energy

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Section: Catalyst Characterizationsupporting

confidence: 92%

Deposition of Pt nanoparticles on different carbonaceous materials by using different preparation methods for PEMFC electrocatalysts

Veizaga

Fernández

Bruno

et al. 2012

International Journal of Hydrogen Energy

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“…This was attributed to the mesoporous carbon that had a larger specific surface area and was without micropores, which gave improved metal dispersion and utilization [83].…”

Section: Mesoporous Carbonmentioning

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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“…The application of mesoporous carbon (MC) as a catalyst support material has been studied extensively due to its favorable properties for PEM fuel cell electrodes [1][2][3][4][5][6][7][8][9][10]. The high surface area allows for a fine dispersion of Pt nanoparticles, thus resulting in a large active catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

“…The interconnected porous structure favors the mass transport of reactants and products [9,10]. The beneficial mass transport properties are particularly relevant for direct methanol fuel cell electrodes where effective transport of methanol to the active sites and rapid removal of CO 2 gas bubbles is crucial [5,6]. Further, it was demonstrated that the performance of hydrogen PEM fuel cells improved by employing mesoporous carbon compared to using non-porous carbon or activated carbon [2,9].…”

Section: Introductionmentioning

confidence: 99%

Improved stability of mesoporous carbon fuel cell catalyst support through incorporation of TiO2

Bauer

Song

Ignaszak

et al. 2010

Electrochimica Acta

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The electrochemical stability of Pt deposited on mesoporous carbon, which was either applied in its unmodified state or coated with 20 wt% TiO 2 , was investigated by cyclic voltammetry in N 2 purged 0.5 M sulfuric acid. XRD analysis revealed that TiO 2 was present in the anatase phase. The mean Pt particle diameter was ∼6 and ∼4 nm for mesoporous carbon with and without TiO 2 , respectively. Pt supported on TiO 2 modified substrates was more stable than Pt supported on conventional mesoporous carbon when subjected to 1000 cycles in the potential range from 0.05 to 1.25 V vs. RHE. This was evident from the observation that the support with TiO 2 retained ∼53% of the electrochemically active surface area relative to the state observed after 100 cycles, whereas ∼33% of the active area remained in the case without TiO 2 . The oxygen reduction mass activity was identical for both fresh samples (i.e., 18 A g −1 Pt). After 1000 cycles the mass activity decreased to 10 A g −1 Pt for the case without TiO 2 , whereas with TiO 2 the deactivation was minor; i.e., the mass activity after 1000 cycles was 17 A g .

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Mesoporous Carbon with Larger Pore Diameter as an Electrocatalyst Support for Methanol Oxidation

Cited by 63 publications

References 21 publications

Deposition of Pt nanoparticles on different carbonaceous materials by using different preparation methods for PEMFC electrocatalysts

Deposition of Pt nanoparticles on different carbonaceous materials by using different preparation methods for PEMFC electrocatalysts

Carbon-Based Nanomaterials

Improved stability of mesoporous carbon fuel cell catalyst support through incorporation of TiO2

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