Preparation and application of mesocellular carbon foams to catalyst support in methanol electro-oxidation

Joo, Ji Bong; Kim, Pil; Kim, Wooyoung; Yi, Jongheop

doi:10.1016/j.cattod.2007.10.086

Cited by 12 publications

(4 citation statements)

References 29 publications

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“…In the proton adsorption/desorption region, current peaks observed at ca. 0.03 V and À0.09 V vs. SCE, which corresponds to Pt (110) and Pt (111), 31 confirmed the existence of Pt, as evidenced by XRD, XPS, SEM and TEM. The electrochemical surface area (ECSA) of Pt is determined to be 32.13 m 2 g À1 for our Pt-G catalyst, which is higher than for Pt-chemically reduced GO catalyst (11.5 m 2 g À1 ), Pt-thermally reduced GO catalyst (20 m 2 g À1 ) and Pt-graphene oxide catalyst (16.9 m 2 g À1 ).…”

Section: Resultssupporting

confidence: 67%

Simultaneous reduction, exfoliation and functionalization of graphite oxide into a graphene-platinum nanoparticle hybrid for methanol oxidation

2012

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We developed a single step thermal method to synthesize platinum nanoparticle functionalized graphene sheets (Pt-G) through the thermal treatment of graphite oxide (GO) with platinum acetylacetonate (Pt(acac) 2 ). The loading concentration of platinum nanoparticles (Pt NPs) on graphene is about 22.3 wt%. We investigate the Pt NP functionalization and the reduction effects of GO by scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis and Raman spectroscopy. The results lead to insights into the formation of Pt-G starting from GO upon increasing the temperature. XPS and XRD analysis confirm that the platinum nanoparticle deposition is accompanied by the reduction and exfoliation of GO. Electrochemical studies reveal that Pt-G shows excellent activity and stability towards the methanol oxidation reaction.

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Section: Resultssupporting

confidence: 67%

Simultaneous reduction, exfoliation and functionalization of graphite oxide into a graphene-platinum nanoparticle hybrid for methanol oxidation

2012

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“…Recently, Joo et al [92] reported that the preparation of 60 wt.% Pt catalyst supported on mesocellular carbon forms, which have a very large pore size (>10 nm), by a solution reduction method using ethanol as solvent and sodium ethoxide as a reducing agent. Similarly, the 50 wt.% Pt-supported catalyst on CMK-3, which is one of the famous OMCs, was prepared by the solution reduction method using paraformaldehyde as a new reducing agent [40].…”

Section: Preparation Methods For Mesoporous Carbon-supported Catalystmentioning

confidence: 99%

Mesoporous Carbon‐Supported Catalysts for Direct Methanol Fuel Cells

Pak

Kim

Chang

2009

Electrocatalysis of Direct Methanol Fuel Cells

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Recent developments in information technology and convergence of multifunctions in personal mobile devices have caused an increase of more than 350 times in consumption of per-person portable power in the last two decades and this is expected to exceed 10 000 Wh/year/person at 2010 as listed in Table 9.1. In addition, recently developed 4G mobile devices will require advanced functions such as fast exchanging data, mobile internet, digital mobile broadcasting, which demand more power and energy capacity (Table 9.2). To overcome these issues, new concepts of portable power source are required, and the direct methanol fuel cell (DMFC) is one of the most promising candidates owing to its high energy capacity as well as quick charging time of methanol liquid fuel.To increase the competitiveness of the DMFC system to the current technology of Li-ion battery, there are many requirements such as low cost, small volume and high energy efficiency, energy density and power density. Especially to mitigate the cost issue, the amount of Pt catalyst in the electrode should be reduced by increasing the activity of catalyst itself and/or the utilization ratio of Pt in the electrode. Finding more active element or alloys than Pt, which has been the most active component for several decades, is very challenging. Relatively, improving Pt use is easier due to versatility of methods of increasing the use of catalytic nanoparticles. As a simple approach, using a carbon support, the dispersion of catalyst can be increased or its size can be reduced to increase exposed surface areas of the active components. Among the various carbon supports, mesoporous carbon (MC), defined by the size of pore inside the carbon particles, is dealt with in view of novel support for electrocatalyst in this chapter. We introduce MC in Section 9.2, in which the concept, preparation and characteristics of MC are presented. As a preparation method, both the hard-templating and soft-templating methods are discussed. In Section 9.3, the preparation and characterization methods for supported catalysts using MC are covered. Examples of the application and approaches of MC for DMFC catalysts Electrocatalysis of Direct Methanol Fuel Cells. Edited

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“…The Pt catalysts were prepared by a chemical reduction method using sodium ethoxide as the reducing agent [11,30]. The Pt precursor (H 2 PtCl 6 , Acros) and sodium ethoxide (Aldrich, NaOCH 2 CH 3 ) were dissolved in ethanol.…”

Section: Preparation Of Graphitic Carbons and Supported Pt Catalystsmentioning

confidence: 99%

Preparation of highly crystalline graphitic nanocarbon for the electro-oxidation of methanol

et al. 2010

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Highly crystalline graphitic nanocarbons (GNC) have been prepared by the wet-air treatment of hydrothermallyderived graphitic porous carbon. The materials were characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, and electrochemical methods. The experimental results revealed that the treatment temperature has a significant effect on the morphology and degree of graphitic crystallinity. When GNC was treated at 450 °C under a wet-air atmosphere, the product (GNC-450) consisted of aggregates of silkworm-shaped carbon nanoparticles with enhanced graphitic characteristics. GNC-450 was evaluated as a catalyst support in the electro-oxidation of methanol. The Pt/GNC-450 catalyst contained smaller Pt particles and had a higher electrochemically active surface area than a commercial carbon black-supported Pt catalyst. In the electro-oxidation of methanol, the Pt/GNC-450 catalyst showed the highest performance among the Pt catalysts examined in this study. The superior catalytic performance appears to be closely related to the enhanced graphitic characteristics with highly dispersed Pt nanoparticles on the graphitic layers, which have a positive effect on the electrochemical performance.

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Preparation and application of mesocellular carbon foams to catalyst support in methanol electro-oxidation

Cited by 12 publications

References 29 publications

Simultaneous reduction, exfoliation and functionalization of graphite oxide into a graphene-platinum nanoparticle hybrid for methanol oxidation

Simultaneous reduction, exfoliation and functionalization of graphite oxide into a graphene-platinum nanoparticle hybrid for methanol oxidation

Mesoporous Carbon‐Supported Catalysts for Direct Methanol Fuel Cells

Preparation of highly crystalline graphitic nanocarbon for the electro-oxidation of methanol

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