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Oviedo, Spain

Staiti P.,CNR Institute of Advanced Energy Technologies Nicola Giordano | Arenillas A.,INCAR CSIC | Lufrano F.,CNR Institute of Advanced Energy Technologies Nicola Giordano | Menendez J.A.,INCAR CSIC
Journal of Power Sources | Year: 2012

An ultracapacitor (UCap) based on carbon xerogel electrodes and sodium sulfate electrolyte was investigated in the voltage range between 0 and 1.8 V. Notwithstanding the high value of maximum voltage (1.8 V) the UCap exhibited excellent stability during 20000 of cycling test. Moreover, the achievement of this high voltage made possible to obtain high value of specific energy. The stability was possible because the potential limits of electrode-electrolyte decomposition at positive and negative electrodes were never achieved. This is because an asymmetric UCap with different amounts of carbon xerogel in the electrodes was used. The UCap with the carbon xerogel of BET specific surface area of 3100 m 2 g -1 demonstrated a specific energy of 17.5 Wh kg -1 and a specific capacitance of 156 F g -1 and, retained 91% of initial capacitance after 20000 cycles of duration test. © 2012 Elsevier B.V. All rights reserved.

Bermudez J.M.,INCAR CSIC | Francavilla M.,University of Foggia | Francavilla M.,National Research Council Italy | Calvo E.G.,INCAR CSIC | And 4 more authors.
RSC Advances | Year: 2014

An efficient methodology based on low temperature microwave-induced pyrolysis has been developed for syngas production from macroalgae. The protocol provided unprecedented hydrogen production, with switchable H2/CO ratios depending on pyrolysis conditions which were found to remarkably improve conventional pyrolysis experiments even at significantly higher temperatures (400 vs. 800 °C). Arcing effects under microwave irradiation, which result in an interesting observed pseudo-catalytic effect promoted by the metal oxides contained in macroalgae, seem to account for the improved results. © the Partner Organisations 2014.

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