Using the Multiple SEA Method to Synthesize Pt/Carbon Xerogel Electrocatalysts for PEMFC Applications

Zubiaur, Anthony; Chatenet, Marian; Maillard, Frédéric; Lambert, Stéphanie D.; Pirard, Jean‐Paul; Job, Nathalie

doi:10.1002/fuce.201300208

Cited by 8 publications

(7 citation statements)

References 20 publications

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“…2 nm; this Pt weight percentage is too low for PEMFC applications. This cycle can however be repeated several times in order to increase the metal loading; up to now, it was possible to reach 25 wt.% without decreasing the Pt dispersion [21,22]. In order to lower the Pt losses during the impregnation, the Pt precursor solution can be recycled from one cycle to another without any problem.…”

Section: Discussionmentioning

confidence: 99%

“…In some case, a pre-peak at ca. 0.81 V vs. NHE appears [22], but its intensity always remains low for samples prepared using the SEA method (multiple or not). The position of the peak, however, shifts towards lower potentials when the reduction temperature increases.…”

Section: −mentioning

confidence: 95%

“…This obviously induces inacceptable metal losses during the synthesis process, and the SEA technique, although quite elegant in scientific studies, cannot be applied as presented in industrial production. Alternatively, one can, of course, thus imagine re-using the residual solution by re-adjusting its pH and concentration at the required values [22]. Indeed, as long as the concentration of the H2PtCl6 solution remains higher than ~4 mmol/L, the Pt uptake remains constant [20].…”

Section: Multiple Strong Electrostatic Adsorptionmentioning

confidence: 99%

“…Since all of the electrocatalytic results obtained in the same conditions were identical and because the present paper is clearly focused on catalyst preparation, the complete data are not fully reproduced here. However, details can be found in [21][22][23].…”

Section: −mentioning

confidence: 99%

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Design of Pt/Carbon Xerogel Catalysts for PEM Fuel Cells

et al. 2015

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Abstract:The design of efficient catalytic layers of proton exchange membrane fuel cells (PEMFCs) requires the preparation of highly-loaded and highly-dispersed Pt/C catalysts. During the last few years, our work focused on the preparation of Pt/carbon xerogel electrocatalysts, starting from simple impregnation techniques that were further optimized via the strong electrostatic adsorption (SEA) method to reach high dispersion and a high metal weight fraction. The SEA method, which consists of the optimization of the precursor/support electrostatic impregnation through an adequate choice of the impregnation pH with regard to the support surface chemistry, leads to very well-dispersed Pt/C samples with a maximum 8 wt.% Pt after drying and reduction under H2. To increase the metal loading, the impregnation-drying-reduction cycle of the SEA method can be repeated several times, either with fresh Pt precursor solution or with the solution recycled from the previous cycle. In each case, a high dispersion (Pt particle size ~3 nm) is obtained. Finally, the procedure can be simplified by combination of the SEA technique with dry impregnation, leading to no Pt loss during the procedure.

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Section: Discussionmentioning

confidence: 99%

Section: −mentioning

confidence: 95%

Section: Multiple Strong Electrostatic Adsorptionmentioning

confidence: 99%

Section: −mentioning

confidence: 99%

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Design of Pt/Carbon Xerogel Catalysts for PEM Fuel Cells

et al. 2015

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“…These materials have a high surface specific area, display a tailorable pore texture and are good conductors of electricity . Therefore, they can be used in a wide range of industrial applications as adsorbents, catalyst supports, and battery or fuel cell electrodes . The original process developed by Pekala is not applicable on a large scale because it involves long aging time of the gel and supercritical drying.…”

Section: Introductionmentioning

confidence: 99%

Toward a continuous synthesis of porous carbon xerogel beads

et al. 2018

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A continuous process for producing porous carbon xerogel beads has been developed. It consists in injecting a pre‐cured aqueous solution of resorcinol and formaldehyde on top of a column filled with hot oleic acid. The latter is pumped on the top of the column and fed at the bottom, generating an upward flow that can be adjusted to match the terminal velocity of the settling beads. Thus, the bead residence time in the column can be adjusted to match the gelation time, allowing the beads to solidify before reaching the bottom of the vessel. The obtained beads are subsequently dried and pyrolyzed. The developed experimental setup proved the continuous synthesis of porous carbon beads is possible. Nevertheless, the shaping process caused various texture changes of the porous carbon, which mainly yields macropores instead of micro and mesopores. This process also leads to the build‐up of a denser skin around the beads. © 2018 American Institute of Chemical Engineers AIChE J, 64: 1049–1058, 2018

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Microwave‐assisted Synthesis of Pd Oxide‐rich Pd Particles on Nitrogen/Sulfur Co‐Doped Graphene with Remarkably Enhanced Ethanol Electrooxidation

et al. 2016

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Nitrogen and sulfur co‐doped graphene supported Pd oxide‐rich (PdOx‐rich) Pd nanoparticles (Pd/NS‐rGO) are synthesized by microwave‐assisted ascorbic acid reduction method. Raman spectrum reveals that the introduced NS co‐doping could introduce more defects on the graphene surface. X‐ray diffraction, X‐ray photoelectron spectrum, SEM and TEM images indicate that the synthesized PdOx‐rich Pd particles are well‐dispersed on NS co‐doped graphene surface. Cyclic voltammograms curves illustrate that the Pd/NS‐rGO catalyst exhibits a larger electrochemically active surface area (35.7 m2 g−1) and higher positive current density (1,054.0 mA mg−1 Pd) than other catalysts prepared by similar methods. The Pd/NS‐rGO catalyst also reveals superior anti‐poisoning intermediate species ability and amazing stability. The electrocatalytic mechanism is also detailedly discussed and the designed Pd/NS‐rGO catalyst has opened up a new insight and methodology for the construction of a high performance and stability ethanol electrocatalysts in corrosive alkaline environments.

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Using the Multiple SEA Method to Synthesize Pt/Carbon Xerogel Electrocatalysts for PEMFC Applications

Cited by 8 publications

References 20 publications

Design of Pt/Carbon Xerogel Catalysts for PEM Fuel Cells

Design of Pt/Carbon Xerogel Catalysts for PEM Fuel Cells

Toward a continuous synthesis of porous carbon xerogel beads

Microwave‐assisted Synthesis of Pd Oxide‐rich Pd Particles on Nitrogen/Sulfur Co‐Doped Graphene with Remarkably Enhanced Ethanol Electrooxidation

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