Recent advances in activity and durability enhancement of Pt/C catalytic cathode in PEMFC

Yu, Xingwen; Ye, Siyu

doi:10.1016/j.jpowsour.2007.07.049

Cited by 519 publications

(247 citation statements)

References 185 publications

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“…3). This may be due to a significant sp 2 carbon network expanding along the direction tangential to the surface of iron particles and accumulating through a graphite shell (Yu and Ye 2007;Wang et al 2011).…”

Section: Proposed Mechanisms Involved In Formation Of Graphenementioning

confidence: 99%

Preparation and Characterization of Biobased Graphene from Kraft Lignin

2017

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Graphene was manufactured from commercial kraft lignin, and its forming mechanism, structure, and properties were investigated. A single factor test was employed to determine the optimum conditions of the production of graphene nanosheets. Kraft lignin was mixed with iron powders as catalyst with different weight ratios. The mixed carbon source and catalyst were thermally treated at 1000 °C and incubated for a period of time in a tubular furnace. The thermally treated carbon materials were analyzed by field emission scanning electron microscopy (FE-SEM), Raman spectroscopy, atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The preferable conditions for production of graphene nanosheets from kraft lignin were determined. The graphene fold structure was obtained after thermally treating for 90 min when the ratio of carbon source to iron was 3:1. The results revealed that folded lamellar graphene structure increased with greater holding time. Carbon nanotubes (CNTs) were observed after thermal treatment for 105 min. These results indicate the formation of graphite crystal structure and multi-layered graphene from kraft lignin in the presence of iron catalyst.

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Section: Proposed Mechanisms Involved In Formation Of Graphenementioning

confidence: 99%

Preparation and Characterization of Biobased Graphene from Kraft Lignin

2017

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“…The size of the simulation box in the x-y direction is the same as the graphite sheet. Periodic boundary conditions were applied in x, y, and z directions.To investigate the effect of surface properties of the carbon support, [34][35][36] we introduced surface functional groups at the graphite sheet. Two extreme cases, 64 adsorbed surface groups of carboxyl (COOH) and carboxylate (COO -), were simulated, as shown in Figure 1b and c, respectively.…”

mentioning

confidence: 99%

Molecular Dynamics Study of Ionomer and Water Adsorption at Carbon Support Materials

et al. 2010

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1021/jp1034135Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Molecular dynamics study of ionomer and water adsorption at carbon support materials Mashio, Tetsuya; Malek, Kourosh; Eikerling, Michael; Ohma, Atsushi; Kanesaka, Hiroyuki; Shinohara, Kazuhiko http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/droits L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=e0f8664e-92a9-4fa6-ae25-0e8aa91cf434 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=e0f8664e-92a9-4fa6-ae25-0e8aa91cf434 Research Center, Nissan Motor Co., Ltd., 1 Natsushima-cho, Yokosuka-shi, Kanagawa 237-8523, Japan, National Research Council Canada Institute for Fuel Cell InnoVation, 4250 Wesbrook Mall, VancouVer, British Columbia V6T 1W5, Canada, and Department of Chemistry, Simon Fraser UniVersity, Burnaby, British Columbia, Canada V5A 1S6 ReceiVed: April 16, 2010; ReVised Manuscript ReceiVed: June 16, 2010 Molecular dynamics simulations were applied to unravel the microscopic structure of Nafion ionomer and water adsorbed at graphitized carbon sheets. The considered molecular model resembles microscopic interfaces at which current generation proceeds in catalyst layers of polymer electrolyte fuel cells. The analysis of equilibrated interfacial configurations shows that Nafion ionomer forms a thin adhesive film on the graphite sheet. At low water content, water molecules form clusters around sulfonic acid groups. At high water content, a continuous water film wets the ionomer surface. The structural analysis of this model did not provide any evidence for interconnected water clusters existing inside the ionomer film, which implies that hydronium ion transport will occur mainly along hydrated ionomer ...

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“…Furthermore, the aggregation of platinum particles can significantly diminish catalytic activity [59]. In particular, the gradual deterioration of the current of the Pt/C catalyst at the first 2000 s may be attributed to the loss of carbon in the catalyst and the oxidation of carbon into CO or CO 2 species.…”

Section: Durability Testmentioning

confidence: 99%