Graphene supported electrocatalysts for methanol oxidation

Bong, Sungyool; Kim, Yang‐Rae; Kim, In; Woo, Seunghee; Uhm, Sunghyun; Lee, Jae Kwang; Kim, Hasuck

doi:10.1016/j.elecom.2009.11.005

Cited by 203 publications

(87 citation statements)

References 19 publications

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“…In order to achieve this goal, several research groups have focused on developing supported Ag nanoparticles, e.g. Ag/polysaccharide [16,19], Ag/graphene [20] or Ag/polymer [18] nanocarrier composites, improving transport and modulating aggregation of Ag nanoparticle active centres.…”

Section: Introductionmentioning

confidence: 99%

Natural reducing agents for electroless nanoparticle deposition: Mild synthesis of metal/carbon nanostructured microspheres

Duffy

Reynolds

Sanders

et al. 2013

Materials Chemistry and Physics

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Composite materials are of interest because they can potentially combine the properties of their respective components in a manner that is useful for specific applications. Here, we report on the use of coffee as a low-cost, green reductant for the room temperature formation of catalytically active, supported metal nanoparticles. Specifically, we have leveraged the reduction potential of coffee in order to grow Pd and Ag nanoparticles at the surface of porous carbon microspheres synthesized via ultraspray pyrolysis. The metal nanoparticle-on-carbon microsphere composites were characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and thermal gravimetric analysis (TGA). To demonstrate the catalytic activity of Pd/C and Ag/C materials, Suzuki coupling reactions and nitroaromatic reduction reactions were employed, respectively.3

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Section: Introductionmentioning

confidence: 99%

Natural reducing agents for electroless nanoparticle deposition: Mild synthesis of metal/carbon nanostructured microspheres

Duffy

Reynolds

Sanders

et al. 2013

Materials Chemistry and Physics

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“…2a), the mass activity (i m ) at the first peak potential of the commercial Pt/C (47.60 wt% Pt, TKK, Japan), supported 3-D Pt NFs (37.52 wt% Pt) ,and supported 3-D Pt NFs (18.34 wt% Pt) were 579, 781, and 982 mA mg -1 , respectively. It is obvious that the i m -peak values of our samples are far better than those of commercial Pt/C and reported Pt-based electrocatalysts results (Kim et al 2007;Bong et al 2010;Koenigsmanna and Wong 2011). The corresponding oxidation potentials of the supported Pt NFs were obviously lower than that of the commercial Pt/C catalysts (see Fig.…”

mentioning

confidence: 54%

“…Affirmatively, methanol exhibits higher volumetric energy density, and its storage and transport is much easier as compared to hydrogen, while the oxidation of methanol currently is still kinetically limited at the anode (Siracusanoa et al 2009;Yang et al 2010). Based on this fact, there is great interest on developing novel and efficient anode electrocatalysts for DMFCs (Kim et al 2007;Bong et al 2010;Koenigsmanna and Wong 2011). Recently, inspired progress has been achieved by using hybrid metal nanostructures (e.g., alloy and core/shell structures of transition/noble metals), in which the high activity of the system has been demonstrated within a limited life-span (Bing et al 2010;Yang et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Supported 3-D Pt nanostructures: the straightforward synthesis and enhanced electrochemical performance for methanol oxidation in an acidic medium

Pollet

et al. 2013

J Nanopart Res

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Noble metal nanostructures with branched morphologies [i.e., 3-D Pt nanoflowers (NFs)] by tridimensionally integrating onto conductive carbon materials are proved to be an efficient and durable electrocatalysts for methanol oxidation. The well-supported 3-D Pt NFs are readily achieved by an efficient cobalt-induced/carbon-mediated galvanic reaction approach. Due to the favorable nanostructures (3-D Pt configuration allowing a facile mass transfer) and supporting effects (including framework stabilization, spatially separate feature, and improved charge transport effects), these 3-D Pt NFs manifest much higher electrocatalytic activity and stability toward methanol oxidation than that of the commercial Pt/C and Pt-based electrocatalysts.

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“…Moreover, there is seldom change of I f /I b even after 50 cycles, indicating good stability in the electrochemical cycling process. To further verify that graphene is a promising candidate as supports of high-loading metal catalyst in fuel cells, a composite of highly loaded 80 wt.% Pt-Ru on graphene sheets was prepared using colloidal method, using Vulcan XC-72R (a kind of active carbon with a surface area of ~250 m 2 g -1 ) for comparison (Bong et al, 2010). As displays in Fig.…”

Section: Methanol Fuel Cellsmentioning

confidence: 99%