Hydrogen storage with hetero porphyrin aggregates
| Autor: | Muzaffer Tonguc Oztek, Sandy Loucks, Darlene K. Slattery, Michael D. Hampton |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Thermogravimetric analysis
Hydrogen Renewable Energy Sustainability and the Environment Chemistry Inorganic chemistry Cationic polymerization Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Porphyrin Thermogravimetry Hydrogen storage chemistry.chemical_compound Fuel Technology Differential scanning calorimetry polycyclic compounds Organic chemistry Thermal stability |
| Zdroj: | International Journal of Hydrogen Energy. 36:6705-6710 |
| ISSN: | 0360-3199 |
| Popis: | Hydrogen interaction of porphyrin hetero-pairs has been studied by differential scanning calorimetry (DSC). Aggregates were prepared by spontaneous aggregation of water soluble anionic porphyrins meso-tetra(4-carboxyphenyl)porphine (TCPP) and meso-tetra(4-sulfonatophenyl)porphine (TPPS) with cationic meso-tetra-p-trimethylaminophenyl porphine tetrachloride (TAP). Aggregate formation in solution was investigated via UV–visible spectroscopy at different pH ranges. At neutral to basic conditions, porphyrin pairs formed partially soluble hetero H-aggregates and at low pH, soluble homo J-aggregates was formed. H-aggregates were isolated by centrifuging and freeze-drying. The obtained solids were studied by X-ray powder diffraction. Thermal stability of dry aggregates was determined by thermogravimetric analysis. The TCPP-TAP hetero aggregates exhibited hydrogen uptake between 80 °C and 250 °C. The amount of hydrogen absorbed by the sample corresponds to 0.29% by weight, indicating a potential use of such materials as a solid state hydrogen storage medium. |
| Databáze: | OpenAIRE |
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