Novel silica/poly(2,6-dimethyl-1,4-phenylene oxide) hybrid anion-exchange membranes for alkaline fuel cells: Effect of heat treatment

Novel silica/poly(2,6-dimethyl-1,4-phenylene oxide) hybrid anion-exchange membranes for alkaline fuel cells: Effect of silica content and the single cell performance

“…Meanwhile, non-fluorinated polymer electrolytes have been developed for application in AMFCs, based on polyvinyl alcohol (PVA) [11], polyethersulfones [12], poly(phthalazinon ether sulfone ketone) [13], polysulfone [14] and poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) [15][16][17]. To overcome the inherent disadvantages of these polymers (mechanical, thermal, and chemical stabilities) the polymers have been modified by physical blending [15], chemical functionalization [12], and/or crosslinking [11].…”

“…Although it has not been widely applied, the latter method has the potential for improvement on membrane properties. For instance, we recently prepared a series of anion-exchange hybrid membranes, by incorporation of a fixed content of silica into PPO with thermal treatments at different temperatures, which exhibited superior tensile properties and favorable thermal stabilities [16]. The alkaline resistance is comparable to those of membranes based on partially fluorinated-polymers [19].…”

Hydroxide Exchange Membranes and Ionomers

“…Aliphatic linkages do not compromise IEC because they introduce relatively little additional molecular weight, and at the Silicon-based [59,[87][88][89][90] Physical linkage structure impacts the properties and performance of crosslinked HEMs through the length, connection, and density of the linkage.…”

Alkaline Anion Exchange Membranes for Fuel Cells- A Patent Review

“…The cross-links and the inorganic component, such as -OSi-O-, are hypothesized to increase the thermal stability of the resulting AAEMs. Tripathi et al [106] and Xu and coworkers [107][108][109][110][111][112], Liu and coworkers [113][114], and Suzuki et al [115] have all focused on organic-inorganic composite anion exchange membranes. Commonly encountered amines containing inorganic monomers, such as aminoethylaminopropylmethyldimethoxysilane [115], alkylated triethoxysilylpropylamine (TESPA (+)) [110] and an anion exchange precursor labelled AESP [106] (see Table 1), clearly highlight the preference for resultant silicon containing inorganicorganic hybrids.…”

“…Commonly encountered amines containing inorganic monomers, such as aminoethylaminopropylmethyldimethoxysilane [115], alkylated triethoxysilylpropylamine (TESPA (+)) [110] and an anion exchange precursor labelled AESP [106] (see Table 1), clearly highlight the preference for resultant silicon containing inorganicorganic hybrids. A PPO-based composite membrane quaternized with triethylamine (TEA) [107][108] showed good ion conductivity (11 mS cm -1 ) and produced a power density of 32 mW cm -2 (geometric) when tested in a H 2 / O 2 fuel cell (gases supplied at ambient pressure). 6 ) and hydrogen gas [117].…”