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Monday, February 16, 2009

EFFICIENCY OF HYDROGEN ELECTROLYSERS

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Hydrogen can be used as a non-toxic energy storage and transport
medium. Hydrogen that is made from water using solar energy is a
sustainable and renewable home energy supply.
Thermolysis means splitting water with concentrated solar heat and photoelectrolysis means splitting water in a liquid solar cell.
Electrolysis is the competition for thermolysis and photoelectrolysis at this juncture.
Hydrogen and oxygen can be produced from water using electricity with an electrolyser. This article describes the installation and operation of a 12 cell Hydrogen 1000 Watt electrolyser. This electrolyser can produce 170 liters/hour (6 cubic feet/hour) of hydrogen and 85 liters/hour (3 cubic feet/hour) of oxygen (at standard temperature and pressure).
The purified hydrogen and oxygen can be used in fuel cells (to produce direct current electricity) and catalytic burners (for heating and cooking) without poisoning or damaging the noble metal catalyst materials. The gases can also be used for motor vehicle fuel.
A cubic meter (35.3 cubic feet) of hydrogen gas takes about 5.9 hours to produce in this electrolyzer, when operated at its rated input power of 1000 Watts. This means the energy required to produce a cubic meter of hydrogen and 0.5 cubic meter of oxygen is about 5.9 kW/hr. This translates to an efficiency of 51%. Typical industrial scale plants operate at about 4.5 kW-hr/m3 or 67% efficiency at high current density. The efficiency is better at lower current density.


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