A novel guanidinium grafted poly(aryl ether sulfone) for high-performance hydroxide exchange membranes

Zhang, Qiang; Li, Shenghai; Zhang, Suobo

doi:10.1039/c0cc01834a

Cited by 209 publications

(138 citation statements)

References 33 publications

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“…[22][23][24][25] In this work, we aim to study the DMAFC performances of two AEMs developed at Sandia National Laboratories (SNL). Both membranes are based on a poly(phenylene) backbone, the first one developed, aminated tetramethyl poly(phenylene) (ATMPP), contains BTMA cations and the second one, trimethylamine hexamethylene poly(phenylene) (TMAC6PP), has hexamethylene spacers separating the quaternary ammonium groups from the poly(phenylene) backbone ( Figure 1).…”

mentioning

confidence: 99%

A Direct Methanol Alkaline Fuel Cell Based on Poly(phenylene) Anion Exchange Membranes

Janarthanan

Pilli

Horan

et al. 2014

J. Electrochem. Soc.

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The Investigation of the performance of poly(phenylene) based anion exchange membranes (AEMs) in a direct methanol fuel cell is reported. The fuel cell performances were tested with different anode gas diffusion layers as a function of concentrations of fuel and electrolyte using two commercially available platinum catalysts supported on carbon. Normalized current density values demonstrated good performance for a poly(phenylene) AEM, with a cation consisting of six methylene spacers attached to a trimethyl ammonium group, with a maximum current density of 11.8 mA cm −2 mg −1 in a KOH free fuel. The platinum catalyst (46%) from Tanaka showed a better performance (10.4 mA cm −2 mg −1 ) compared to the platinum catalyst from E-TEK (5.1 mA cm −2 mg −1 ) in 1M methanol fuel feed under identical conditions. We observed that the MEA with a Zoltek gas diffusion layer on the anode showed the best performance (226 mA cm −2 and 53.8 mW cm −2 ) in the presence of KOH, suggesting that a hydrophilic gas diffusion layer plays a significant role in improving the fuel cell performance. A durability test for a MEA in 1M methanol and 1M KOH for 67 h showed an overall degradation rate of 400 μV h Direct methanol fuel cells based on proton exchange membranes (PEMs) have received considerable attention, as compared to hydrogen fuel cells, they have potential system simplicity, high system energy density, improved volumetric fuel storage and fuel supply. 1,2Direct methanol alkaline fuel cells (DMAFCs) which employ an anion exchange membrane (AEM) electrolyte are more attractive than devices based on PEMs as they should provide improved electrode kinetics, simple water management, lower methanol permeability, and use of non-platinum metal catalysts.3-6 Solid-state AEM electrolytes are more attractive than the conventional liquid KOH electrolytes as the carbonates and bicarbonates formed during operation do not precipitate as the cation is the AEM, and although adding an additional ionic resistance to the electrode, do diffuse through the cationic ionomer. 7,8 In spite of these advantages, it is important to note that except for a few reports, high performance in DMAFCs are shown only in the presence of the aqueous basic electrolyte, even for commercially available AEMs.9,10 In general, alkaline DMFC studies employ commercially available AEMs, such as Tokuyama A-006, A-010, Fumatech FAA-2, and Morgane ADP from Solvay. [9][10][11][12][13][14][15][16] Radiation grafted membranes have been demonstrated to be promising AEMs for DMAFCs with a KOH free methanol fuel.17,18 Still a great amount of research is being focused on improving the performance of available commercial AEMs as well as on development of new AEMs to achieve stable, highly conducting, and mechanically robust membranes for fuel cells with high performance and long durability.There are very few alkaline direct methanol fuel cell reports where neat methanol is used and aqueous methanol is still the fuel of choice, in fact high power densities have only been achieved for these ...

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mentioning

confidence: 99%

A Direct Methanol Alkaline Fuel Cell Based on Poly(phenylene) Anion Exchange Membranes

Janarthanan

Pilli

Horan

et al. 2014

J. Electrochem. Soc.

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“…For example, the route in Ref. [9], the authors present a route which employed thiourea as guanidylation reagents at 80 • C; the cyanamide route used DMSO as the solvent [8]; and Vilsmeier salt even required the participation of phosgene [11,12]. These conditions are not environmental friendly and may destroy the chemical and thermal stability of the base polymers.…”

Section: Ppomentioning

confidence: 97%

“…Generally, guanidylation reagents are directly used to modify the amino group or chlorine atoms in the polymer matrixes to form guanidyl groups. And the guanidylation reagents mainly include cyanamide and its derivative [8], thiourea and its derivative [9,10], Vilsmeier salt obtained from urea and phosgene [11,12], and 1H-pyrazole-1-carboxamidine hydrochloride (HPCA) [13,14]. Among these guanidylation reagents, thiourea, cyanamide and Vilsmeier salts need to be used in organic solvents or at higher temperatures.…”

Section: Ppomentioning

confidence: 99%

Guanidylated hollow fiber membranes based on brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO) for gold sorption from acid solutions

Jin

Wang

You

et al. 2012

Journal of Hazardous Materials

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“…It has been widely used in various industrial applications, such as electronics, machinery, automobile, food, and medical equipments, paints and so on. [1][2][3] However, because of their amorphous nature, poly(aryl ether sulfone)s is readily soluble in common solvents such as N-methylpyrrolidone (NMP), N,N-Dimethylacetamide (DMAc), chloroform, and tetrahydrofuran (THF). This limits their application.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of novel boric acid modified poly(aryl ether sulfone) membranes

Wang

Zhang

Liu

et al. 2014

J of Applied Polymer Sci

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In this article, boric acid-modified poly(aryl ether sulfone) (PES-B) membranes were prepared by solution blending, solution casting, evaporation, and programmed temperature curing method for the first time. The chemical modification of poly(aryl ether sulfone) was accomplished by the curing of poly(aryl ether sulfone) with pendent phenyl hydroxide (PES-OH) under the function of boric acid. The reaction mechanisms and the effects of boric acid content were thoroughly investigated. Processing conditions and structures of PES-B were determined by FT-IR spectra. It has been found that the B(OH) 3 /PES composite membranes were completely cured after treatment at 300 C for 4 h. When boric acid content was over 4.7%, PES-B membranes presented phase separation and full cross-linking structures. DSC measurements demonstrated that the addition of boric acid had influenced the glass transition temperature of PES-B, which provided the proof of the appearance of cross-linking network structure. TGA results confirmed that the thermal stability of the prepared PES-B composites was improved. Furthermore, the cross-linked composite membranes exhibited excellent mechanical property and solvent resistance.

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A novel guanidinium grafted poly(aryl ether sulfone) for high-performance hydroxide exchange membranes

Cited by 209 publications

References 33 publications

A Direct Methanol Alkaline Fuel Cell Based on Poly(phenylene) Anion Exchange Membranes

A Direct Methanol Alkaline Fuel Cell Based on Poly(phenylene) Anion Exchange Membranes

Guanidylated hollow fiber membranes based on brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO) for gold sorption from acid solutions

Preparation and properties of novel boric acid modified poly(aryl ether sulfone) membranes

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