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Yongdong Wang – One of the best experts on this subject based on the ideXlab platform.

  • imidazolium functionalized polysulfone hydroxide exchange membranes for potential applications in alkaline membrane direct Alcohol Fuel cells
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Gaohong He, Shuang Gu, Xuemei Wu, Liguang Du, Yongdong Wang

    Abstract:

    Abstract A series of imidazolium-functionalized polysulfones were successfully synthesized by chloromethylation-Menshutkin two-step method. PSf-ImOHs show the desired selective solubility: insoluble in Alcohols (e.g., methanol and ethanol), and soluble in 50 vol.% aqueous solutions of acetone or tetrahydrofuran, implying their potential applications for both the Alcohol-resistant membranes themselves and the ionomer solutions in low-boiling-point water-soluble solvents. PSf-ImOH also possesses very high thermal stability ( T OD : 258 °C), higher than quaternary ammonium and quaternary phosphonium functionalized polysulfones ( T OD : 120 °C and 186 °C, repsectively). Ion exchange capacity (IEC) of PSf-ImOH membranes ranges from 0.78 to 2.19 mmol g −1 with degree of chloromethylation from 42% to 132% of original chloromethylated polysulfone. As expected, water uptake, swelling ratio, and hydroxide conductivity increase with IEC and temperatures. With 2.19 mmol g −1 of IEC, the PSf-ImOH 132% membrane exhibits the highest hydroxide conductivity (53 mS cm −1 at 20 °C), higher than those of all other reported polysulfone-based HEMs (1.6–45 mS cm −1 ) and other imidazolium-functionalized HEMs (19.6–38.8 mS cm −1 ). In addition, PSf-ImOH membranes have low methanol permeability of 0.8–4.7 × 10 −7  cm 2  s −1 , one order of magnitude smaller than that of Nafion212 membrane. All these properties indicate imidazolium-functionalized polysulfone is very promising for potential applications in alkaline membrane direct Alcohol Fuel cells.

  • imidazolium functionalized polysulfone hydroxide exchange membranes for potential applications in alkaline membrane direct Alcohol Fuel cells
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Xiaoming Yan, Yongdong Wang

    Abstract:

    Abstract A series of imidazolium-functionalized polysulfones were successfully synthesized by chloromethylation-Menshutkin two-step method. PSf-ImOHs show the desired selective solubility: insoluble in Alcohols (e.g., methanol and ethanol), and soluble in 50 vol.% aqueous solutions of acetone or tetrahydrofuran, implying their potential applications for both the Alcohol-resistant membranes themselves and the ionomer solutions in low-boiling-point water-soluble solvents. PSf-ImOH also possesses very high thermal stability ( T OD : 258 °C), higher than quaternary ammonium and quaternary phosphonium functionalized polysulfones ( T OD : 120 °C and 186 °C, repsectively). Ion exchange capacity (IEC) of PSf-ImOH membranes ranges from 0.78 to 2.19 mmol g −1 with degree of chloromethylation from 42% to 132% of original chloromethylated polysulfone. As expected, water uptake, swelling ratio, and hydroxide conductivity increase with IEC and temperatures. With 2.19 mmol g −1 of IEC, the PSf-ImOH 132% membrane exhibits the highest hydroxide conductivity (53 mS cm −1 at 20 °C), higher than those of all other reported polysulfone-based HEMs (1.6–45 mS cm −1 ) and other imidazolium-functionalized HEMs (19.6–38.8 mS cm −1 ). In addition, PSf-ImOH membranes have low methanol permeability of 0.8–4.7 × 10 −7  cm 2  s −1 , one order of magnitude smaller than that of Nafion212 membrane. All these properties indicate imidazolium-functionalized polysulfone is very promising for potential applications in alkaline membrane direct Alcohol Fuel cells.

Kouakou Boniface Kokoh – One of the best experts on this subject based on the ideXlab platform.

  • Activity of platinum–tin catalysts prepared by the Pechini–Adams method for the electrooxidation of ethanol
    Journal of Electroanalytical Chemistry, 2009
    Co-Authors: F.l.s. Purgato, Paulo Olivi, J.-m. Léger, A.r. De Andrade, G. Tremiliosi-filho, Ernesto Rafael Gonzalez, Claude Lamy, Kouakou Boniface Kokoh

    Abstract:

    Abstract Pt–Sn electrocatalysts of different compositions were prepared and dispersed on carbon Vulcan XC-72 using the Pechini–Adams method. The catalysts were characterized by energy dispersive X-ray analysis and X-ray diffraction. The electrochemical properties of these electrode materials were also examined by cyclic voltammetry and chronoamperometric experiments in acid medium. The results showed that the presence of Sn greatly enhances the activity of Pt towards the electrooxidation of ethanol. Moreover, it contributes to reduce the amount of noble metal in the anode of direct Alcohol Fuel cells, which remains one of the challenges to make the technology of direct Alcohol Fuel cells possible. Electrolysis of ethanol solutions at 0.55 V vs . RHE allowed to determine by liquid chromatography acetaldehyde and acetic acid as the main reaction products. CO 2 was also analyzed after trapping it in a NaOH solution indicating that the cleavage of the C–C bond in the ethanol molecule did occur during the adsorption process. In situ IR reflectance spectroscopy helped to investigate in more details the reaction mechanism through the identification of the reaction products as well as the presence of some intermediate adsorbed species, such as linearly bonded carbon monoxide.

  • Activity of platinum–tin catalysts prepared by the Pechini–Adams method for the electrooxidation of ethanol
    Journal of Electroanalytical Chemistry, 2009
    Co-Authors: F.l.s. Purgato, Paulo Olivi, J.-m. Léger, A.r. De Andrade, G. Tremiliosi-filho, Ernesto Rafael Gonzalez, C. Lamy, Kouakou Boniface Kokoh

    Abstract:

    Pt-Sn electrocatalysts of different compositions were prepared and dispersed on carbon Vulcan XC-72 using the Pechini-Adams method. The catalysts were characterized by energy dispersive X-ray analysis and X-ray diffraction. The electrochemical properties of these electrode materials were also examined by cyclic voltammetry and chronoamperometric experiments in acid medium. The results showed that the presence of Sn greatly enhances the activity of Pt towards the electrooxidation of ethanol. Moreover, it contributes to reduce the amount of noble metal in the anode of direct Alcohol Fuel cells, which remains one of the challenges to make the technology of direct Alcohol Fuel cells possible. Electrolysis of ethanol solutions at 0.55 V vs. RHE allowed to determine by liquid chromatography acetaldehyde and acetic acid as the main reaction products. CO(2) was also analyzed after trapping it in a NaOH solution indicating that the cleavage of the C-C bond in the ethanol molecule did occur during the adsorption process. In situ IR reflectance spectroscopy helped to investigate in more details the reaction mechanism through the identification of the reaction products as well as the presence of some intermediate adsorbed species, such as linearly bonded carbon monoxide. (C) 2009 Elsevier B.V. All rights reserved.CAPES/COFECUB[498/05]CAPES[0509078]FAPESP, Brazi

J.-m. Léger – One of the best experts on this subject based on the ideXlab platform.

  • Activity of platinum–tin catalysts prepared by the Pechini–Adams method for the electrooxidation of ethanol
    Journal of Electroanalytical Chemistry, 2009
    Co-Authors: F.l.s. Purgato, Paulo Olivi, J.-m. Léger, A.r. De Andrade, G. Tremiliosi-filho, Ernesto Rafael Gonzalez, Claude Lamy, Kouakou Boniface Kokoh

    Abstract:

    Abstract Pt–Sn electrocatalysts of different compositions were prepared and dispersed on carbon Vulcan XC-72 using the Pechini–Adams method. The catalysts were characterized by energy dispersive X-ray analysis and X-ray diffraction. The electrochemical properties of these electrode materials were also examined by cyclic voltammetry and chronoamperometric experiments in acid medium. The results showed that the presence of Sn greatly enhances the activity of Pt towards the electrooxidation of ethanol. Moreover, it contributes to reduce the amount of noble metal in the anode of direct Alcohol Fuel cells, which remains one of the challenges to make the technology of direct Alcohol Fuel cells possible. Electrolysis of ethanol solutions at 0.55 V vs . RHE allowed to determine by liquid chromatography acetaldehyde and acetic acid as the main reaction products. CO 2 was also analyzed after trapping it in a NaOH solution indicating that the cleavage of the C–C bond in the ethanol molecule did occur during the adsorption process. In situ IR reflectance spectroscopy helped to investigate in more details the reaction mechanism through the identification of the reaction products as well as the presence of some intermediate adsorbed species, such as linearly bonded carbon monoxide.

  • Activity of platinum–tin catalysts prepared by the Pechini–Adams method for the electrooxidation of ethanol
    Journal of Electroanalytical Chemistry, 2009
    Co-Authors: F.l.s. Purgato, Paulo Olivi, J.-m. Léger, A.r. De Andrade, G. Tremiliosi-filho, Ernesto Rafael Gonzalez, C. Lamy, Kouakou Boniface Kokoh

    Abstract:

    Pt-Sn electrocatalysts of different compositions were prepared and dispersed on carbon Vulcan XC-72 using the Pechini-Adams method. The catalysts were characterized by energy dispersive X-ray analysis and X-ray diffraction. The electrochemical properties of these electrode materials were also examined by cyclic voltammetry and chronoamperometric experiments in acid medium. The results showed that the presence of Sn greatly enhances the activity of Pt towards the electrooxidation of ethanol. Moreover, it contributes to reduce the amount of noble metal in the anode of direct Alcohol Fuel cells, which remains one of the challenges to make the technology of direct Alcohol Fuel cells possible. Electrolysis of ethanol solutions at 0.55 V vs. RHE allowed to determine by liquid chromatography acetaldehyde and acetic acid as the main reaction products. CO(2) was also analyzed after trapping it in a NaOH solution indicating that the cleavage of the C-C bond in the ethanol molecule did occur during the adsorption process. In situ IR reflectance spectroscopy helped to investigate in more details the reaction mechanism through the identification of the reaction products as well as the presence of some intermediate adsorbed species, such as linearly bonded carbon monoxide. (C) 2009 Elsevier B.V. All rights reserved.CAPES/COFECUB[498/05]CAPES[0509078]FAPESP, Brazi

  • electrocatalytic oxidation of aliphatic Alcohols application to the direct Alcohol Fuel cell dafc
    Journal of Applied Electrochemistry, 2001
    Co-Authors: C Lamy, El Mustapha Belgsir, J.-m. Léger

    Abstract:

    The electrooxidation of some low molecular weight Alcohols, such as ethanol, ethylene glycol and n-propanol, is discussed in terms of reaction mechanisms and catalytic activity of the anode material. Some examples of a single cell, using a proton exchange membrane (PEM) as electrolyte, are given to illustrate interesting results, particularly for the direct electrooxidation of ethanol. This Alcohol may replace methanol in a direct Alcohol Fuel cell.