Silicotungstic acid/organically modified silane proton-conducting membranes

Dynamic studies of Ormosil membranes

“…Protonic conductivity of these systems was investigated in conditions similar to functioning of PEMFC: in autoclave under saturated humidity and elevated temperatures. Under these conditions, protonic conductivities were measured in situ in the temperature interval 300-433 K for ICS-PPG and ICS-PDMS based membranes enriched with 40% of POM [4]. The membranes based on ICS-PDMS were more brittle but they survived higher temperatures.…”

“…2. ICS-PDMS [4]: 14 g of aminopropyl-terminated poly(dimethylsiloxane) (M r $ 900-1000) (ABCR) and 7.3 g of ICS (ABCR) were mixed with 20 g of THF under reflux (338 K) for 48 h. After evaporation of THF, a colourless viscous precursor resulted ( Fig. 1(b)).…”

“…POM; also named heteropolyacid) in order to obtain proton conducting membranes [4] to be used in polymer electrolyte membrane fuel cells (PEMFC). The heart of this kind of fuel cell is certainly the membrane, which separates the two containers (filled with reactant gases) and must be a good proton conductor, an excellent electronic insulator and should present suitable mechanical, chemical, electrochemical and thermal stabilities.…”

Silyl functionalized poly(vinylidene fluoride)/phosphotungstic acid/aminopropyltrimethoxysilane ternary composite membrane for proton conductivity

“…Good permeability, conductivity and mechanical stability are essential for usage of the membranes at moderate temperature. A number of preparation methods have been developed to enhance the performance of fuel cell membranes such as sulfonation [1,2], polymer blends [3][4][5][6], crosslinking [7][8][9], addition of fillers [10][11][12][13] and the sol-gel method [14][15][16][17]. These methods, however, can hardly satisfy the required properties for polymer electrolyte membranes.…”

Preparation and characterization of Ag‐deposited aminosilane‐modified silicate by chemical reduction method

“…Such versatility arises from combining the benefits and desirable properties of both constituents, inorganic (e.g., mechanical and thermal stability) and organic (e.g., flexibility and functionality) 4. Ormosils have been shown to be excellent hosts for trapping nanoparticles of metals and semiconductors because of their ability to act as stabilizers or surface capping agents 5–8. When nanoparticles are embedded or encapsulated in an Ormosil, the Ormosil terminates the growth of the particles by controlling nucleation 9…”