Preparation of PtSn/C electrocatalysts with improved activity and durability toward oxygen reduction reaction by alcohol-reduction process

Su, Bing‐Jian; Wang, Kuan Wen; Cheng, Tien Chun; Tseng, Chung Jen

doi:10.1016/j.matchemphys.2012.04.065

Cited by 28 publications

(10 citation statements)

References 40 publications

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“…The performance of PEM fuel cells could be further raised by using other kinds of carbon support such as carbon nanotubes [35]. In addition, further reduction of Pt loading could be attained using an alloy of Pt [36,37], and the advantage offered by PLD should still hold for this case. Furthermore, the flow distributors used in this experiment were not optimised for this particular fuel cell active area yet, and thinner PEM can be used to reduce the proton transport resistance [33,34].…”

Section: Discussionmentioning

confidence: 99%

Pulsed Laser Deposition of Platinum Nanoparticles as a Catalyst for High-Performance PEM Fuel Cells

et al. 2016

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Abstract:The catalyst layers for polymer-electrolyte-membrane (PEM) fuel cells were fabricated by deposition of platinum directly onto the gas diffusion layer using pulsed laser deposition (PLD). This technique reduced the number of steps required to synthesize the catalyst layers and the amount of Pt loading required. PEM fuel cells with various Pt loadings for the cathode were investigated. With a cathode Pt loading of 100 µg·cm −2 , the current density of a single cell reached 1205 mA·cm −2 at 0.6 V, which was close to that of a single cell using an E-TEK (trademark) Pt/C electrode with a cathode Pt loading of 400 µg·cm −2 . Furthermore, for a PEM fuel cell with both electrodes prepared by PLD and a total anode and cathode Pt loading of 117 µg·cm −2 , the overall Pt mass-specific power density at 0.6 V reached 7.43 kW·g −1 , which was five times that of a fuel cell with E-TEK Pt/C electrodes. The high mass-specific power density was due to that a very thin nanoporous Pt layer was deposited directly onto the gas diffusion layer, which made good contact with the Nafion membrane and thus resulted in a low-resistance membrane electrode assembly.

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Section: Discussionmentioning

confidence: 99%

Pulsed Laser Deposition of Platinum Nanoparticles as a Catalyst for High-Performance PEM Fuel Cells

et al. 2016

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“…2 observed at about 39.5°, 45.5°, 57°, and 79.5°are attributed to the (111), (200), (220), and (311) reflections of Pt. 25 Analysis of the peak width by the Scherrer equation gave an average Pt crystallite size of 21 and 40 nm for Pt supported on Vulcan C and SiC, respectively. The lack of a Pt diffraction pattern associated with Pt/Norit C was consistent with the high metal dispersion revealed by H 2 chemisorption.…”

Section: Effect Of Carbonaceous Supportmentioning

confidence: 99%

Decarbonylation of heptanoic acid over carbon-supported platinum nanoparticles

Lopez‐Ruiz

Davis

2014

Green Chem.

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The decarbonylation and decarboxylation of heptanoic acid over carbon-supported Pt nanoparticles were studied in a continuous flow fixed bed reactor at 573 K and 37 bar for liquid-phase operation and 1 bar for gas-phase operation. Under liquid-phase conditions, the TOF over Pt supported on Norit carbon was 0.0052 s −1 and independent of Pt loading. At very low conversions, approaching zero, the product selectivity was consistent with decarbonylation as the primary reaction, producing mostly hexenes and CO. As conversion increased from 1% to 5% at 37 bar, substantial amounts of hexane and CO 2 were observed, presumably from secondary side reactions such as water-gas shift (WGS) and hydrogenation instead of direct decarboxylation. The terminal olefin was observed with high selectivity (57%) only during gas-phase operation (1 bar) which facilitated transport of the olefin away from the Pt that also catalyzed double bond isomerization. Some sintering of the Pt metal particles during reaction of heptanoic acid was observed by X-ray diffraction analysis of the spent catalyst. Catalyst regeneration studies were performed over spent catalyst but they failed to restore any catalytic activity.Scheme 1 Decarbonylation and decarboxylation of heptanoic acid.

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“…So, a drastic increase in the application of PEMFC is observed in the past decade. However, most of the researchers focus on materials' characterization 2,14‐22 and the effects of operation parameters on cell performance 11,12,23‐28 . Components of a PEMFC include bipolar plates (BP), gas diffusion layers (GDL), microporous layers (MPL), catalyst layers (CL), and a proton‐exchange membrane.…”

Section: Introductionmentioning

confidence: 99%

Effects of assembling method and force on the performance of proton‐exchange membrane fuel cells with metal foam flow field

et al. 2020

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Recently, highly porous metal foams have been used to replace the traditional open-flow channels to improve gas transport and distribution in the cells. Deformation of flow plate, gas diffusion layer (GDL), and metal foam may occur during assembling. When the cell size is small, the deformation may not be significant. For large area cells, the deformation may become significant to affect the cell performance. In this study, an assembling device that is capable of applying uniform clamping force is built to facilitate fuel cell assembling and alleviate the deformation. A compressing plate that is the same size of the active area is used to apply uniform clamping force before surrounding bolts are fastened. Therefore, bending of the flow plate and deformation of GDL and metal foam can be minimized. Effects of the clamping force on the microstructures of GDL and metal foam, various resistances, pressure drops, and cell performance are investigated. Distribution of the contact pressure between metal foam and GDL is measured by using pressure sensitive films. Field-emission scanning electron microscope is used to observe the microstructures. Electrochemical impedance spectroscopy analysis is used measure resistances. The fuel cell performance is measured by using a fuel cell test system. For the cell design used in this study, the optimum clamping force is found to be 200 kgf. Using this optimum clamping force, the cell performance can be enhanced by 50%, as compared with that of the cell assembled without using clamping plates. With appropriate clamping force, the compression force distribution across the entire cell area can approach uniform. This enables uniform flow distribution and reduces mass transfer resistance. Good contact between GDL and metal foam also lowers the interface resistance. All these factors contribute to the enhanced cell performance.

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Preparation of PtSn/C electrocatalysts with improved activity and durability toward oxygen reduction reaction by alcohol-reduction process

Cited by 28 publications

References 40 publications

Pulsed Laser Deposition of Platinum Nanoparticles as a Catalyst for High-Performance PEM Fuel Cells

Pulsed Laser Deposition of Platinum Nanoparticles as a Catalyst for High-Performance PEM Fuel Cells

Decarbonylation of heptanoic acid over carbon-supported platinum nanoparticles

Effects of assembling method and force on the performance of proton‐exchange membrane fuel cells with metal foam flow field

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