Crystalline Zr(R-PO3)2 and Zr(R-OPO3)2 compounds (R = organic radical)

Alberti, G.; Costantino, U.; Allulli, S.; Tomassini, N.

doi:10.1016/0022-1902(78)80520-x

Cited by 404 publications

(190 citation statements)

References 11 publications

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“…This strategy was originally used for layered compounds by Alberti [228] in order to increase the interlayer spacing in such materials. The approach took advantage of monophosphonates, which acted as spacers between the layers, with no possibility of connection between them.…”

Section: Organically Modified Inorganic Open Frameworkmentioning

confidence: 99%

Open-Framework Inorganic Materials

Cheetham

Férey

Loiseau

1999

Angew. Chem. Int. Ed.

2,368

420

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Aluminosilicate zeolites such as UTD-1 (structure shown) belong to a family of nanoporous inorganic materials that find utility in catalysis, separation, and ion exchange. During the last decade, the rate of discovery of new open-framework materials based, for example, on phosphates, sulfides, halides, nitrides, and coordination compounds has increased dramatically. The synthesis, structures, and properties of this remarkable class of materials are reviewed.

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Section: Organically Modified Inorganic Open Frameworkmentioning

confidence: 99%

Open-Framework Inorganic Materials

Cheetham

Férey

Loiseau

1999

Angew. Chem. Int. Ed.

2,368

420

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“…105 Because of their ability to undergo infinite swelling in appropriate solvents, these materials can be incorporated into polymeric proton-conducting membranes. 103 It is interesting to remark that organic derivatives of the R-zirconium phosphate 106 and γ-zirconium phosphate 107 PR′R-groups. In these structures, R and R′ are organic groups, bridging through phosphorus atoms to an inorganic two-dimension matrix.…”

Section: Inorganic Solid Proton Conductorsmentioning

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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“…Actually, crystalline metal phosphonate form a wide class of hybrid materials which has been widely studied since the first report in 1978 of Alberti and coworkers 8) on the preparation of Zr alkyl and phenyl phosphonates, Zr(RPO 3 ) 2 . However, in the case of simple phosphonic acids, metal phosphonates usually adopt layered structures, with no interlayer porosity.…”

Section: Introductionmentioning

confidence: 99%