Preparation and electrochemical characterization of platinum and ruthenium catalysts deposited on fluorinated carbon supports

Kim, Seok; Sohn, Hee-Jin; Hong, Sung–Kwon; Park, Soo‐Jin

doi:10.1007/s10800-009-9837-y

Cited by 3 publications

(2 citation statements)

References 29 publications

(25 reference statements)

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“…04-0802) and no Ru peak (JCPDS No. 06-0663) was detected, indicating that Ru entered the lattice of Pt [43,44]. The alloy degrees were similar between the commercially available CB/PtRu and CB/PtRu@SiO 2 [45].…”

Section: Resultsmentioning

confidence: 62%

SiO₂ decoration dramatically enhanced the stability of PtRu electrocatalysts with undetectable deterioration in fuel cell performance

Yang

et al. 2018

Nanotechnology

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Prevention of Ru dissolution is essential for steady CO tolerance of anodic electrocatalysts in direct methanol fuel cells. Here, we demonstrate a facile way to stabilize Ru atoms by decorating commercial CB/PtRu with SiO, which shows a six-fold higher stability and similar activity toward a methanol oxidation reaction leading to no discernible degradation in fuel cell performance compared to commercial CB/PtRu electrocatalysts. The higher stability and stable CO tolerance of SiO-decorated electrocatalysts originate from the SiO coating, since Ru atoms are partially ionized during SiO decorating, resulting in difficulties in dissolution; while, in the case of commercial CB/PtRu, the dissolved Ru offers active sites for Pt coalescences and CO species resulting in the rapid decay of the electrochemical surface area and fuel cell performance. To the best of our knowledge, this is the first study about the stabilization of Ru atoms by SiO. The highest stability is obtained for a PtRu electrocatalyst with negligible effect on the electrochemical properties.

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Section: Resultsmentioning

confidence: 62%

SiO₂ decoration dramatically enhanced the stability of PtRu electrocatalysts with undetectable deterioration in fuel cell performance

Yang

et al. 2018

Nanotechnology

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“…Moreover, platinum (Pt) is an excellent catalyst and one of the best electrode materials for DMFCs [2][3][4]. However, the high cost, low electrocatalytic activity and stability of common Pt catalyst inhibit their broad application for DMFCs [3].…”

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confidence: 99%

Catalytic activity and controllable deposition of platinum nanoparticles on ionic polymer-functionalized graphene as catalysts for direct methanol fuel cells

Park¹,

Song²,

Sun³

et al. 2015

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Direct methanol fuel cells (DMFCs) are considered promising candidates for mobile and transport applications due to their high energy density, zero emissions, and relatively low operating temperature [1]. Moreover, platinum (Pt) is an excellent catalyst and one of the best electrode materials for DMFCs [2][3][4]. However, the high cost, low electrocatalytic activity and stability of common Pt catalyst inhibit their broad application for DMFCs [3]. It is well known that the electrocatalytic performance of a fuel cell greatly depends on the composition, shape, size, and dispersion of the catalyst nanoparticles (NPs). The materials supporting catalyst play an important role in controlling these properties [5]. However, during fuel-cell operation, a gradual oxidation of the carbon support leads to detachment of Pt NPs from the carbon support, allowing their agglomeration, which can reach an unacceptable level [6].In the past few years, graphene has emerged as the ideal material for a variety of different energy applications including fuel cells, Li-ion batteries, supercapacitors, and solar cells. This is because of its large thermal conductivity, high surface area, high mechanical stability, and excellent electrical conductivity [7]. Chemical modification of the inert surface of graphene sheets is necessary for the uniform dispersion of Pt NPs. Currently, chemical modification is achieved by methods including acid oxidation, ionic liquid [8], and conductive polymer [9].Recently, we developed a facile and efficient route to decorate Pt NPs onto reduced graphene oxide (RGO) functionalized with poly(diallyldimethyl ammonium chloride) (PDDA), as acationic polymer. In this work, we investigated the synergistic effect of a poly(sodium 4-styrenesulfonate) (PSS)-functionalized graphene support and PDDA polymer for obtaining better electrocatalytic performance for DMFCs. These results demonstrated that, with high electronic conductivity and easier charge transfer, Pt/PDDA-PSS-functionalized RGO (PRGO) exhibited higher activity and stability than did Pt-decorated PDDA-RGO (Pt/ PDDA-RGO), and Pt-decorated RGO (Pt/RGO).PSS (MW = 70,000) and PDDA (20 wt% in water) was purchased from Sigma-Aldrich (St. Louis, MO, USA). Graphite (99.9%) was purchased from Bay Carbon Inc. (Bay City, MI, USA) and H2PtCl6 6H2O was purchased from Sigma-Aldrich. Ethanol (99.8%), methanol (99.8%), and ethylene glycol (EG, 99.0%) were purchased from DAE JUNG Company and used without further purification. Distilled water was used in all preparation experiments.Graphene oxide (GO) was synthesized from graphite powders using a modified Hummer's method [10]. Briefly, graphite powders were first oxidized by sulfuric acid (H 2 SO 4 ), sodium nitrate (NaNO 3 ), potassium permanganate (KMnO 4 ) for the acid treatment. Deionized (DI) water and hydrogen peroxide (H 2 O 2 ) were put into the mixture with strong stirring at 90°C for 4 h. Finally, DI water and hydrogen chloride (HCl) was put into the mixture. After removal of residual salts and acid, the resultant di...

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Preparation of polymeric modifier-attached graphene-supported bimetallic Pt–Pd nanocomposites, and their electrochemical properties as electro-catalysts

Park

Kim

2013

Res Chem Intermed

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Preparation and electrochemical characterization of platinum and ruthenium catalysts deposited on fluorinated carbon supports

Cited by 3 publications

References 29 publications

SiO₂ decoration dramatically enhanced the stability of PtRu electrocatalysts with undetectable deterioration in fuel cell performance

SiO₂ decoration dramatically enhanced the stability of PtRu electrocatalysts with undetectable deterioration in fuel cell performance

Catalytic activity and controllable deposition of platinum nanoparticles on ionic polymer-functionalized graphene as catalysts for direct methanol fuel cells

Preparation of polymeric modifier-attached graphene-supported bimetallic Pt–Pd nanocomposites, and their electrochemical properties as electro-catalysts

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Preparation and electrochemical characterization of platinum and ruthenium catalysts deposited on fluorinated carbon supports

Cited by 3 publications

References 29 publications

SiO2 decoration dramatically enhanced the stability of PtRu electrocatalysts with undetectable deterioration in fuel cell performance

SiO2 decoration dramatically enhanced the stability of PtRu electrocatalysts with undetectable deterioration in fuel cell performance

Catalytic activity and controllable deposition of platinum nanoparticles on ionic polymer-functionalized graphene as catalysts for direct methanol fuel cells

Preparation of polymeric modifier-attached graphene-supported bimetallic Pt–Pd nanocomposites, and their electrochemical properties as electro-catalysts

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SiO₂ decoration dramatically enhanced the stability of PtRu electrocatalysts with undetectable deterioration in fuel cell performance

SiO₂ decoration dramatically enhanced the stability of PtRu electrocatalysts with undetectable deterioration in fuel cell performance