Protonic conducting organic/inorganic nanocomposites for polymer electrolyte membrane

Honma, Itaru; Nomura, S.; Nakajima, Hitoshi

doi:10.1016/s0376-7388(00)00636-0

Cited by 206 publications

(122 citation statements)

References 24 publications

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“…This may allow for use of sulfonated polymers at a low sulfonation degree. For preparing organic-inorganic composite membranes, the used polymer components include, besides PFSA, those without functional groups such as poly-(ethylene oxide)s (PEO) [229][230][231][232] and PBI, [233][234][235] and those with functional groups such as sulfonated polystyrene, 236 sulfonated polysulfone (SPSF), 214,215,237 sulfonated polyetheretherketone (SPEEK), 27,225,[238][239][240] and many others. [244][245][246][247][248][249][250][251][252][253][254] The solid inorganic compounds include oxides such as amorphous silica, inorganic proton conductors, and in many cases silica-supported inorganic proton conductors.…”

Section: Reviewsmentioning

confidence: 99%

Approaches and Recent Development of Polymer Electrolyte Membranes for Fuel Cells Operating above 100 °C

et al. 2003

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The state-of-the-art of polymer electrolyte membrane fuel cell (PEMFC) technology is based on perfluorosulfonic acid (PFSA) polymer membranes operating at a typical temperature of 80°C. Some of the key issues and shortcomings of the PFSA-based PEMFC technology are briefly discussed. These include water management, CO poisoning, hydrogen, reformate and methanol as fuels, cooling, and heat recovery. As a means to solve these shortcomings, hightemperature polymer electrolyte membranes for operation above 100°C are under active development. This treatise is devoted to a review of the area encompassing modified PFSA membranes, alternative sulfonated polymer and their composite membranes, and acidbase complex membranes. PFSA membranes have been modified by swelling with nonvolatile solvents and preparing composites with hydrophilic oxides and solid proton conductors. DMFC and H 2 /O 2 (air) cells based on modified PFSA membranes have been successfully operated at temperatures up to 120°C under ambient pressure and up to 150°C under 3-5 atm. Alternative polymers are selected from silicon-and fluorine-containing inorganic polymers or aromatic hydrocarbon polymers and functionalized by sulfonation. The sulfonated hydrocarbons and their inorganic composites are potentially promising for high-temperature operation. High conductivities have been obtained at temperatures up to 180°C. Acid-base complex membranes constitute another class of electrolyte membranes. A high-temperature PEMFC based on H 3 PO 4 -doped PBI has been demonstrated for operation at temperatures up to 200°C under ambient pressure. The advanced features include high CO tolerance, simple thermal and water management, and possible integration with the fuel processing unit.

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Section: Reviewsmentioning

confidence: 99%

Approaches and Recent Development of Polymer Electrolyte Membranes for Fuel Cells Operating above 100 °C

et al. 2003

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“…For these problems, recent interests are extending to inorganic materials 1), 2) or inorganic/organ ic composites. 3) 7) Alminotriphosphate hydrate AlH 2 P 3 O 10 EnH 2 O (n23) is acid aluminum salt of condensed phosphoric acid (H 5 P 3 O 10 ) and is mainly applied as a rustresisting paint and an adsorbent for basic gas. The synthesis method and chem ical properties of AlH 2 P 3 O 10 have been carefully studied by d 'Yvoire,8), 9) and the existence of two types of AlH 2 P 3 Water contents in the sample were decided by ther mogravimetry (TG).…”

Section: Introductionmentioning

confidence: 99%

“…3) 7) Alminotriphosphate hydrate AlH 2 P 3 O 10 EnH 2 O (n23) is acid aluminum salt of condensed phosphoric acid (H 5 P 3 O 10 ) and is mainly applied as a rustresisting paint and an adsorbent for basic gas. The synthesis method and chem ical properties of AlH 2 P 3 O 10 have been carefully studied by d 'Yvoire,8), 9) and the existence of two types of AlH 2 P 3 Water contents in the sample were decided by ther mogravimetry (TG). The measurement was performed twice in air: at the rst time, the weight of sample was meas ured on heating up to 300 C, and after holding the sample in humid air at room temperature for several hours, the weight of the same sample was measured again up to 600 C. The rate of temperature increase for both measurements was x ed at 2 C/min.…”

Section: Introductionmentioning

confidence: 99%

Stability and Proton Conductivity of AlH2P3O10 nH2O under Various Water Vapor Pressures

優実

早苗

勝

2003

J. Ceram. Soc. Japan

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íXmOöC³ºjIP AlH 2 P 3 O 10 E nH 2 O mÀè«gÓéÄï`±Á« cDÀEìcE{R åw ¶YZp¤C1538505 sÚaeîê 461Stability and proton conductivity of AlH 2 P 3 O 10 EnH 2 O (n23) were investigated in the temperature range from 75 C to 150 C under various water vapor pressures. The hydrolysis from AlH 2 P 3 O 10 EnH 2 O to Al(H 2 PO 4 ) 3 started at 100 C under a relative humidity (RH) of 60÷, and further hydrolysis to AlPO 4 took place with increasing temperature and humidity. At 75 C, the original phase was maintained under saturated water vapor pressure. Conductivity measurements at 75 C (0÷RH98÷) and 100 C (0÷RH60÷) in dicated an abrupt increase in conductivity with increasing water content n in the range of n1.0 to 2.0 at both temperatures. The proton conductivity achieved a value s5.0~10 |3 SEcm |1 at 75 C and 98÷ RH. It is assumed that the proton conductivity in the crystal became larger by formation of continuous hydrogen bonding in AlH 2 P 3 O 10 EnH 2 O.

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“…The significant contemporary interest in organicinorganic hybrid materials reflects both the fundamental chemistry of the rational design of complex materials and practical applications to fields as diverse as catalysis [1], optical materials [2][3], membranes [4][5][6] and sorption [7][8]. One synthetic strategy for design of inorganic-organic hybrid materials is to select suitable inorganic materials and organic ligands with the structure-directing properties [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A new zinc complex of 1-propyl-1H-benzo[d] imidazole: synthesis, characterization and electrocatalysis

2010

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Abstract:The present work reports the synthesis, characterization and performance of a new zinc(II) complex of [Zn(C 3 H 7 -bim) 2 Br 2 ] (bim = benzimidazole) as electrocatalyst for trichloroacetic acid and bromate reduction. Its structure was characterized by X-ray crystallography, IR spectroscopy and elemental analysis. The zinc atom adopts a distorted tetrahedral geometry by coordinating to two bromine atoms and two nitrogen atoms from two 1-propyl-1H-benzo[d]imidazole ligands. The electrochemical behavior and electrocatalysis of the zinc complex bulk-modified carbon paste electrode (Zn-CPE) have been studied by cyclic voltammetry. The Zn-CPE shows good electrocatalytic activities toward the reduction of trichloroacetic acid and bromate. The detection limit and the sensitivity are 0.05 μM, 67.43 μA μM -1 for trichloroacetic acid detection, and 0.02 μM, 69.94 μA μM -1 for bromate detection, respectively. This modified electrode shows good reproducibility, high stability, low detection limit, technical simplicity and possibility of rapid preparation, which is important for practical applications. New Materials & Function Coordination

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Protonic conducting organic/inorganic nanocomposites for polymer electrolyte membrane

Cited by 206 publications

References 24 publications

Approaches and Recent Development of Polymer Electrolyte Membranes for Fuel Cells Operating above 100 °C

Approaches and Recent Development of Polymer Electrolyte Membranes for Fuel Cells Operating above 100 °C

Stability and Proton Conductivity of AlH2P3O10 nH2O under Various Water Vapor Pressures

A new zinc complex of 1-propyl-1H-benzo[d] imidazole: synthesis, characterization and electrocatalysis

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