Effects of grafting parameters on the properties of proton exchange membranes based on sulfo-functionalized porous silicon for micro direct methanol fuel cells
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Mei Wang
Abstract
3-Mercaptopropyltrimethoxysilane [MPTMS, (CH3O)3SiCH2CH2CH2SH] can be grafted to porous silicon via a simple chemical grafting method and then sulfonated to prepare a proton exchange membrane (PEM) for application in micro direct methanol fuel cells (μDMFCs). The concentration of MPTMS and the pH of the solvent, which is varied by adding glacial acetic acid (GAA), play important roles in the chemical grafting process. In this work, PEMs based on sulfo-functionalized porous silicon were prepared at MPTMS concentrations ranging from 10 wt.% to 90 wt.% and GAA concentrations ranging from 0 wt.% to 10 wt.% to study the effects of grafting parameters on the proton transport properties of PEMs. Electrochemical impedance spectroscopy shows that the proton conductivity of the PEMs can be tuned by changing the MPTMS and GAA concentrations, and it reaches a maximum of 0.082 S/cm at an MPTMS concentration of 30 wt.% and a GAA concentration of 5 wt.%. The effects of MPTMS and GAA concentrations on the properties of PEMs are discussed in the context of two competitive reaction pathways of MPTMS molecules: dehydration condensation with silanols on the walls of porous silicon and self-polymerization.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 61704157
Award Identifier / Grant number: 2015BSJJ055
Funding statement: This work was supported by the National Natural Science Foundation of China (No. 61704157, Funder Id: http://dx.doi.org/10.13039/501100001809) and the Doctoral Research Foundation of Zhengzhou University of Light Industry (No. 2015BSJJ055).
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©2019 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Material properties
- Banana and plantain fiber-reinforced polymer composites
- Characterizations of PMMA-based polymer electrolyte membranes with Al2O3
- Effects of grafting parameters on the properties of proton exchange membranes based on sulfo-functionalized porous silicon for micro direct methanol fuel cells
- The effect of surface modification of PMMA/chitosan composites on improving adsorption properties for chelating Pb2+
- Characterization of organic solar cells using semiconducting polymers with different bandgaps
- Hindered phenol-mediated damping of polyacrylate rubber: effect of hydrogen bonding strength on the damping properties
- Correlation between fiber orientation distribution and mechanical anisotropy in glass-fiber-reinforced composite materials
- Preparation and assembly
- Replacement of sodium alginate polymer, urea and sodium bicarbonate in the conventional reactive printing of cellulosic cotton
- Carboxylic acid modified pH-responsive composite polymer particles
- Synthesis of SiO2 nanoparticle from bamboo leaf and its incorporation in PDMS membrane to enhance its separation properties
Artikel in diesem Heft
- Frontmatter
- Material properties
- Banana and plantain fiber-reinforced polymer composites
- Characterizations of PMMA-based polymer electrolyte membranes with Al2O3
- Effects of grafting parameters on the properties of proton exchange membranes based on sulfo-functionalized porous silicon for micro direct methanol fuel cells
- The effect of surface modification of PMMA/chitosan composites on improving adsorption properties for chelating Pb2+
- Characterization of organic solar cells using semiconducting polymers with different bandgaps
- Hindered phenol-mediated damping of polyacrylate rubber: effect of hydrogen bonding strength on the damping properties
- Correlation between fiber orientation distribution and mechanical anisotropy in glass-fiber-reinforced composite materials
- Preparation and assembly
- Replacement of sodium alginate polymer, urea and sodium bicarbonate in the conventional reactive printing of cellulosic cotton
- Carboxylic acid modified pH-responsive composite polymer particles
- Synthesis of SiO2 nanoparticle from bamboo leaf and its incorporation in PDMS membrane to enhance its separation properties
