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Title of article :
Integrating hydrogen generation and storage in a novel compact electrochemical system based on metal hydrides
Author/Authors :
C.M. Rangel، نويسنده , , V.R. Fernandes، نويسنده , , Y. Slavkov، نويسنده , , L. Bozukov، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
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Abstract :
The development of efficient and reliable energy storage systems based on hydrogen technology represents a challenge to seasonal storage based on renewable hydrogen. State of the art renewable energy generation systems include separate units such as electrolyzer, hydrogen storage vessel and a fuel cell system for the conversion of H2 back into electricity, when required. In this work, a novel electrochemical system has been developed which integrates hydrogen production, storage and compression in only one device, at relatively low cost and high efficiency. The developed prototype comprises a six-electrode cell assembly using an AB5-type metal hydride and Ni plates as counter electrodes, in a 35-wt% KOH solution. Metal hydride electrodes with chemical composition LaNi4.3Co0.4Al0.3 were prepared by high frequency vacuum melting followed by high temperature annealing. X-ray phase analysis showed typical hexagonal structure and no traces of other intermetallic compounds belonging to the La–Ni phase diagram. Thermodynamic study has been performed in a Sieverts type of apparatus produced by Labtech Int. During cycling, the charging/discharging process was studied in situ using a gas chromatograph from Agilent. It is anticipated that the device will be integrated as a combined hydrogen generator and storage unit in a stand-alone system associated to a 1-kW fuel cell.
Keywords :
Metal hydrides , Stand-alone systems , renewable hydrogen , Hydrogen generator/storage
Journal title :
Journal of Power Sources
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