ElectroChem Inc. PEM Fuel Cell with Dead-ended Operation Radha Jalan, Ph.D. President and CEO ElectroChem, Inc 400 W. Cummings Park.

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Presentation transcript:

ElectroChem Inc. PEM Fuel Cell with Dead-ended Operation Radha Jalan, Ph.D. President and CEO ElectroChem, Inc 400 W. Cummings Park Woburn, MA USA Presented at ICEPS-2008 November 27 th

ElectroChem Inc. A Brief History 1986 ElectroChem founded 1992 First to develop and sell a portable fuel cell system 1993 First to develop computerized test equipment 1995 First fuel cell company to be online : First to develop a test station for 5 independent cells testing 2005 Received Massachusetts High Tech All Star Energy Award

ElectroChem Inc. The Company  A leading company working in the area of Energy Storage, Hydrogen Generation and Fuel Cells  40 years of experience in developing new technologies for NASA, DOE, DOD, and EPRI  Over 20 years of experience in developing, manufacturing and selling fuel cell products to researchers around the world  A vision of a future where a sustainable global economy resides in harmony with a clean, healthy environment

ElectroChem Inc. ECcell TM Energy Storage System a Regenerative System

ElectroChem Inc. Electrolyzer Based Home Hydrogen Refueling (HHR) System

ElectroChem Inc. Research Objectives Develop Passive PEM fuel cells - No moving parts - Dead-ended operation Develop PEM fuel cells for zero-gravity operation

ElectroChem Inc. Dead-ended Operation (I) Dead-ended operation is not considered in a Reformate fuel cell When pure H 2 is used as fuel, Dead-ended operation can be applied to H 2 side of a fuel cell Oxidant Air Fuel H 2, CO, CO 2 Oxidant Air Fuel H 2

ElectroChem Inc. Dead-ended Operation (II) When pure O 2 is used as an oxidant, It is considered to have an O 2 Dead-ended operation - High energy efficiency - Safety concerns But There is a challenge to remove the product water while running an O 2 Dead-ended operation fuel cell Oxidant O 2 Fuel H 2

ElectroChem Inc. Product Water Removal Water is produced on the O 2 /Air side of fuel cells Dead-ended operation Porous flow channel Water is transported by wicking effect ElectroChem MEA Open-ended operation Open flow channel Water is carried away by high air flow Conventional MEA

ElectroChem Inc. Fuel Cell Test Parameters Fuel cell size : 50 cm 2 Operation condition: - 75 o C, 30 psig (H 2 /O 2 ) mA/cm 2 Test parameters - operate fuel cell at one stoic of reactant gas - change the orientation of the fuel cel l

ElectroChem Inc. Cell Stability operate fuel cells at one stoic of reactant gas Demonstrates very stable performance at low excess gas conditions

ElectroChem Inc. Zero-Gravity Evaluation

ElectroChem Inc. Orientation Independence (I) No significant effect due to changing of orientations 0o0o H2H2 O2O2 90 o O 2 electrode

ElectroChem Inc. Orientation Independence (II) Product water can be moved upward against gravity 180 o

ElectroChem Inc. Orientation Independence (III) 270 o O 2 electrode 90 o O 2 electrode No significant effect due to changing of orientations

ElectroChem Inc. Comparative Cell Performance Porous flow field provides an advantage: The elimination of mass transfer limit

ElectroChem Inc. Conclusions Fuel cell with open channel demonstrates higher performance than the conventional flow channel cell – better reactant gas transport The cell demonstrates Stable Operation at Extremely Low Excess Oxygen Flow Rates - Enabling Passive Operation The cell demonstrates no effects of Change in Orientation on performance - Potential for “Zero-G” Water Removal

ElectroChem Inc. Acknowledgement This work was funded by NASA under Contract NNJ06JD71C