WO2005084166-A2  See also references of EP 1665441A2EP1665441-A2  LEDJEFF K ET AL: "REGENERATIVE FUEL CELL FOR ENERGY STORAGE IN PV SYSTEMS" CONVERSION TECHNOLOGIES (CONTINUED), ELECTROCHEMICAL CONVERSION. BOSTON, AUG. 4 - 9, 1991, PROCEEDINGS OF THE INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, NEW YORK, IEEE, US, vol. VOL. 3 CONF. 26, 4 August 1991 (1991-08-04), pages 538-541, XP000299764 ISBN: 0-89448-163-0;  See also references of WO 2005084166A2;  See references of WO 2005084166A2US7364810-B2  "High Temperature Electrolysis of Steam and Carbon Dioxide", Soren Hojgaard Jensen et al., from Proceedings of Riso International Energy Conference, held at Riso National Laboratory, Denmark, May 19-21, 2003, Riso-R-1405(CN), pp. 204-215, L.S. Petersen and H. Jensen, eds.;  Cell and Stack Construction: Low-Temperature Cells, L.G. Austin, NASA SP-120, 1967, no month.;  Ledjeff, K. et al., "Regenerative Fuel Cell for Energy Storage in PV Systems", Proceedings of the 26th Intersociety Energy Conversion Engineering Conference, vol. 3, Conf 26, Aug. 1991, pp. 538-541.;  Low Cost Reversible Fuel Cell System, Proceedings of the 2000 U.S. DOE Hydrogen Program Review, Jun. 15, 2000, NRELCP-570-28890.;  Low Cost, Compact Solid Oxide Fuel Cell Generator, NASA Small Business Innovation Research Program, no date.;  Low Cost, High Efficiency Reversible Fuel Cell (and Electrolyzer) Systems, Proceedings of the 2001 DOE Hydrogen Program Review NRELCP-570-30535, no month.;  Low Cost, High Efficiency Reversible Fuel Cell Systems, Proceedings of the 2002 U.S. DOE Hydrogen Program Review, NRELCP-610-32405, no month.;  Regenerative Fuel Cells for High Altitude Long Endurance Solar Powered Aircraft, F. Mitlitsky, et al, 28th Intersociety Energy Conversion Engineering Conference (IECEC), Jul. 28, 1993, UCRL-JC-113485.;  Small, Ultra Efficient Fuel Cell Systems, Advanced Technology Program ATP 2001 Competition (Jun. 2002).;  U.S. Appl. No. 10446,704, filed May 29, 2003.;  Unitized Regenerative Fuel Cells for Solar Rechargeable Aircraft and Zero Emission Vehicles, F. Mitlitsky, et al, 1994 Fuel Cell Seminar, Sep. 6, 1994, UCRL-JC-117130, (Sep.).WO2005084166-A3  See also references of EP 1665441A2;  See also references of EP 1665441A4EP1665441-B1  LEDJEFF K ET AL: "REGENERATIVE FUEL CELL FOR ENERGY STORAGE IN PV SYSTEMS" CONVERSION TECHNOLOGIES (CONTINUED), ELECTROCHEMICAL CONVERSION. BOSTON, AUG. 4 - 9, 1991, PROCEEDINGS OF THE INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, NEW YORK, IEEE, US, vol. VOL. 3 CONF. 26, 4 August 1991 (1991-08-04), pages 538-541, XP000299764 ISBN: 0-89448-163-0