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2495 |
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Wednesday, September 28, 2011, Saal B2.1 11:50 AM Alternative Power Generation |
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Atmospheric plasma spraying of electrodes for conversion of electricity to hydrogen by high temperature alkaline electrolysis of water
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Peter Tommy Nielsen* / FORCE Technology, Denmark Troels Mathiesen / FORCE Technology, Denmark Jens Klæstrup Kristensen/ FORCE Technology, Denmark Lisbeth Rischel Hilbert/ FORCE Technology, Denmark Lars Yde/ HIRC, Denmark |
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Energy obtained by wind turbines can be foreseen to constitute a significant part of the future energy sources. A major challenge is however the large variation over time in wind energy production and energy conversion from electricity to storable energy is therefore a key technology to master, and it is in this connection important to develop compact, reliable, cheap and energy efficient equipments for this. An obvious solution is production of hydrogen based on water alkaline electrolysis. In the work discussed the atmospheric plasma spraying of Raney nickel (50/50 Ni/Al) was used to develop electrodes with a high specific surface area as well as a high energy efficiency in high temperature water alkaline electrolysis. The coating process were analyzed using a plume analyzer as the primary tool and the coating properties were analyzed by a combination of bonding strength measurement, optical (OM) and scanning electron microscopy (SEM) as well as testing of the activated electrodes in a laboratory electrolysis cell. The results of the spraying process analysis is reported together with the electrochemical properties of the activated electrodes, and with regard to energy efficiency very positive results are obtained for the measured overvoltage. |