- High pressure electrolysis
High pressure electrolysis (HPE) is the
electrolysis of waterby decomposition of water(H2O) into oxygen(O2) and hydrogengas (H2) due to an electric current being passed through the water. The difference with an standard electrolyzer is the compressed hydrogenoutput between 5000 and 10000 psi.
DOEbelieves that high pressure electrolysis, supported by ongoing research and development, will contribute to the enabling and acceptance of technologies where hydrogen is the energycarrier between renewable energy resources and clean energy consumers.Alkaline, High Pressure Electrolysis ( [http://www.hydrogen.energy.gov/pdfs/progress06/ii_h_5_ibrahim.pdf Available here] Accessed 2008-08-9.)]
High pressure electrolysis is being investigated by the DOE for efficient production of hydrogen from water. The target total in 2005 is $4.75 per gge H2 at an efficiency of 64%.2005 DOE H2 Program Review Alkaline, High Pressure Electrolysis.( [http://www.hydrogen.energy.gov/pdfs/review05/pd26_ibrahim.pdf Available here] Accessed 2008-08-9.)] The total goal for the DOE in 2010 is $2.85 per gge H2 at an efficiency of 75%. As of 2005 the DOE provided a total of $1,563,882 worth of funding for research.
The DOE has issued funding for the development of a high pressure electrolysis system operating a 5000-10000 psi.XI.13 High-Efficiency, Ultra-High Pressure Electrolysis with Direct Linkage to Photovoltaic Arrays (Phase II Project) ( [http://www.hydrogen.energy.gov/pdfs/progress05/xi_13_jackson.pdf Available here] Accessed 2008-08-9.)] A main concern of such systems is the mixing of H2 and O2 at these high pressures.
Mitsubishi is pursuing such technology with its High Pressure Hydrogen Energy Generator (HHEG) project.Mitsubishi Monitor August and September 2004 ( [http://www.mitsubishi.com/mpac/e/monitor/back/0408/news.html available here] Accessed 2008-08-9.)]
* [http://ec.europa.eu/research/energy/pdf/efchp_hydrogen1.pdf High pressure electrolyzer]
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