Dufek E.J.,Idaho National Laboratory |
Lister T.E.,Idaho National Laboratory |
Stone S.G.,Giner Electrochemical Systems |
McIlwain M.E.,Idaho National Laboratory
Journal of the Electrochemical Society | Year: 2012
A pressurized electrochemical system equipped for continuous reduction of CO2 is presented. At elevated pressures, using a Ag-based cathode, the quantity of CO which can be generated is 5 times that observed at ambient pressure with faradaic efficiencies as high as 92% observed at 350 mA cm -2. For operation at 225 mA cm-2 and 60°C the cell voltage at 18.5 atm was 0.4 V below that observed at ambient pressure. Increasing the temperature further to 90°C led to a cell voltage below 3 V (18.5 atm and 90°C), which equates to an electrical efficiency of 50%. © 2012 The Electrochemical Society. All right reserved. Source
Agency: Department of Defense | Branch: Navy | Program: STTR | Phase: Phase II | Award Amount: 742.40K | Year: 2011
The US Navy requires advanced power systems for emerging autonomous underwater vehicle platforms, and hydrogen/oxygen fuel cells have been identified as a suitable replacement for the costly and hazardous primary lithium batteries currently in use. Giner Electrochemical Systems, LLC (GES) and Purdue have teamed to demonstrate a novel chemical hydride fueling solution that will enable onboard hydrogen generation at high energy density. The Phase II program will further develop pellet geometry and coating technology, and foam-based hydrogen generation catalysts for use in a fixed-bed reactor. The project will culminate in a fully engineered hydrogen generation system prototype producing 25 SLPM hydrogen, suitable for a 2.5-kWe H2/O2 fuel cell. In the option periods, GES and Purdue will perform extended evaluation and chemical process modeling of the prototype, and also develop and integrate a dead-ended fuel cell with the system.
Agency: Department of Defense | Branch: Army | Program: STTR | Phase: Phase I | Award Amount: 99.74K | Year: 2011
The US Army has identified limitations of the DMFC (poor efficiency) and RMFC (complex system, high temperature process) approaches, and is soliciting innovation that will enable high efficiency hydrogen generation from methanol in a simple approach that has minimal thermal signature. It is the objective of this project to address these needs through the development of a novel hybrid electrochemical power generation device utilizing a direct methanol electrolyzer (DME) and a hydrogen/air fuel cell (FC). Giner Electrochemical Systems, LLC (GES) and NASA"s Jet Propulsion Laboratory (JPL) have teamed repeatedly since the early 1990"s to advance the state-of-the-art DMFC technology, and will collaborate in this STTR Phase I program to adapt our technology to the DME. Advanced electrocatalysts and electrolyte materials will be developed to optimize the efficiency of the methanol-to-hydrogen conversion, and a unitized cell construction will be developed. A high-pressure DME cathode will provide hydrogen with low levels of MeOH and carbon dioxide. GES"experience in integrated electrochemical systems and recent work by JPL will be leveraged to conceptualize a complete system design for a 25W DME-FC hybrid. This system concept would be realized in Phase II, resulting in the delivery of two 25W systems to the Army.
Agency: National Aeronautics and Space Administration | Branch: | Program: SBIR | Phase: Phase II | Award Amount: 599.92K | Year: 2011
Giner Electrochemical Systems (GES) proposes to develop a cathode liquid feed, proton-exchange membrane electrolyzer stack and system capable of producing 3,600 psi oxygen. We propose to subcontract Hamilton-Sundstrand Human Space Systems (H-S) to share unique state-of-the-art technologies that provide the best path to meeting program objectives. GES will share their data and expertise with high balanced pressure electrolyzers and H-S will contribute their data and expertise in high differential pressure electrolyzer systems. Based on the high pressure anode design concept developed in Phase I, GES will further develop the electrolyzer cell and stack design. In parallel, H-S will develop the key subsystem and control components for a brassboard balance of plant. The program will culminate in the fabrication, assembly, and demonstration of a brassboard high oxygen pressure generation system.
Agency: National Aeronautics and Space Administration | Branch: | Program: SBIR | Phase: Phase II | Award Amount: 599.91K | Year: 2011
Development of an improved water management membrane for a static vapor feed electrolyzer that produces sub-saturated H2 and O2 is proposed. This improved membrane can increase the performance and especially the durability of static vapor feed electrolyzers. Static vapor feed electrolyzers greatly simplify electrolyzer systems as they eliminate the need for water/gas phase separation, which is particularly challenging in a zero gravity environment. Maintaining water in the vapor phase greatly reduces membrane swelling which should increase durability. Finally, by keeping water in the vapor phase the MEA is not exposed to ion and other contaminants that are carried by a liquid water stream, further increasing durability and simplifying the system by reducing the need for ultra-pure water.The primary goal of this Phase II program then is to demonstrate the enhanced performance and durability of a static vapor feed electrolyzer utilizing an improved water management membrane.