Enhanced physical stability and chemical durability of sulfonated poly(arylene ether sulfone) composite membranes having antioxidant grafted graphene oxide for polymer electrolyte membrane fuel cell applications

Polymer Nanocomposite Membranes of Sulfonated Poly(Styrene‐Isobutylene‐Styrene) With Sulfonated Graphene Oxide for Fuel Cell and Protective Clothing Applications

“…GO was 100% sulfonated according to elemental analysis (EA) results. The FTIR spectra of the nanofillers are presented in (3,390 cm −1 ), aromatic CH stretching vibration (2,944 cm −1 ), stretching vibration in COOH (1,719 cm −1 ), unoxidized aromatic C=C bonds (1,521 cm −1 ), OH deformation (1,405 cm −1 ), C-O stretching vibration in epoxy group (1,197 cm −1 ), and C-O stretching vibration in alkoxy group (1,054 cm −1 ) [2,15,17,22,34]. The major vibration bands associated with SO 3 H and Si − O stretching (both at ca.…”

“…Oxyradical formation during DMFC operation destabilizes the membrane, lowering its performance and life cycle [55]. In other E458 POLYMER ENGINEERING AND SCIENCE-2019 DOI 10.1002/pen studies, the oxidative stability has been enhanced [1] or at the very least retained [15,21] after incorporation of the fillers. In the case of SO 3 H SIBS, these radicals cleave the exposed sulfonic acid side groups on the para position of the aromatic groups in the block copolymer.…”

“…GO has been extensively studied as organic filler to a variety of polymer matrices as a mean of improving or modifying the properties of the polymers for different applications including fuel cells [13][14][15][16][17][18][19][20][21][22][23][24]. Polyethylene oxide was modified with 0.5% GO to create a proton conducting membrane with enhanced properties [25].…”

Hybrid Solid Polymer Electrolytes with Two‐Dimensional Inorganic Nanofillers

“…Membranes of sulfonated poly(arylene ether sulfone)/aminotetramethylpiperidine-grafted GO (SPAES/HA-GO) were able to stabiliset he polymer in terms of protonc onductivity and water retention, giving the SPAES/0.5 wt %H A-GOm embrane ap roton conductivity of 0.017 Scm À1 even at low relative humidity.T he composites may be appliedt oh igh-temperature PEMFCsw ith no risk of membrane dehydration (Figure 13 A). [86] Excessives ulfonation of sulfonated poly ether ether ketone (sPEEK)i sd etrimental towards PEMs,b ut the addition of SPVDF-HFP and sulfonated GO (SGO) serves to reinforce the nanocomposite towards better performance merits.D espite lower values than Nafion, ternary composites of sPEEK with SPVDF-HFP and SGO have been reported to attain am aximum proton conductivity of 0.1225Scm À1 at 90 8Ca nd were able to achieve higher conductivities even at 130 8C, provingt hat a solid polymer electrolyte allows operation at highert emperatures with no risk of dehydration. [87] Recently,s ulfonated "holey" GO (SHGO) ( Figure 13 B) obtained by ultrasonicating SGO in concentrated nitric acid was used as as caffold to prepare SHGO/sPEEK composites as as olution towards improved proton transport on the basal planeso fG O.…”

Degradation of Toxic Organic Contaminants by Graphene Cathode in an Electro‐Fenton System

“…Usually, carbon materials with excellent characteristics of conductivity, gas diffusion, adsorption and catalysis are chosen as cathode materials. Graphene, an excellent functional material, has been widely used in super capacitors [8], transistors [9,10], fuel cells [11], etc., but as electrode materials in electro-catalytic degradation of organic matter, very few have been reported. In this research, a new CuO-graphene electrode was constructed by pressing nano-CuO and pure graphene together.…”