Fuel Cell Stacks and Flow Cell Batteries
Fuel cells and flow cells, although perhaps using similar chemistry to batteries, have the distinction of not containing the energy storage medium or fuel. With a continuous flow of fuel and oxidant, available fuel cells and flow cells continue to convert the energy storage medium into electric energy and waste products. Fuel cells distinctly contain a fixed electrolyte whereas flow cells also require a continuous flow of electrolyte. Flow cells typically have the fuel dissolved in the electrolyte.
| Fuel cell type | Dry weight | Power-to-weight ratio | Example Use |
|---|---|---|---|
| Redflow Power+BOS ZB600 10kWh ZBB | 900 kg | 5.6 W/kg (9.3 W/kg peak) | Rural Grid support |
| Ceramic Fuel Cells BlueGen MG 2.0 CHP SOFC | 200 kg | 10 W/kg | |
| 15 W/kg CHP | |||
| MTU Friedrichshafen 240 kW MCFC HotModule 2006 | 20 t | 12 W/kg | |
| Smart Fuel Cell Jenny 600S 25W DMFC | 1.7 kg | 14.7 W/kg | Portable military electronics |
| UTC Power PureCell 400 kW PAFC | 27,216 kg | 14.7 W/kg | |
| GEFC 50V50A-VRB Vanadium redox battery | 80 kg | 31.3 W/kg (125 W/kg peak) | |
| Ballard Power Systems Xcellsis HY-205 205 kW PEMFC | 2,170 kg | 94.5 W/kg | Mercedes-Benz Citaro O530BZ |
| UTC Power/NASA 12 kW AFC | 122 kg | 98 W/kg | Space Shuttle orbiter |
| Ballard Power Systems FCgen-1030 1.2 kW CHP PEMFC | 12 kg | 100 W/kg | Residential cogeneration |
| Ballard Power Systems FCvelocity-HD6 150 kW PEMFC | 400 kg | 375 W/kg | Bus and heavy duty |
| Honda 2003 43 kW FC Stack PEMFC | 43 kg | 1000 W/kg | Honda FCX Clarity |
| Lynntech, Inc. PEMFC lab prototype | 347 g | 1,500 W/kg |
- Full vehicle power-to-weight ratio shown below
Read more about this topic: Power-to-weight Ratio, Examples, Electrochemical (galvanic) and Electrostatic Cell Systems
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—Henry David Thoreau (1817–1862)
“Let man consider what he is in comparison with all existence; let him regard himself as lost in this remote corner of nature; and from the little cell in which he finds himself lodged, I mean the universe, let him estimate at their true value the earth, kingdoms, cities, and himself. What is a man in the infinite?”
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“The current of our thoughts made as sudden bends as the river, which was continually opening new prospects to the east or south, but we are aware that rivers flow most rapidly and shallowest at these points.”
—Henry David Thoreau (1817–1862)
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—Gilbert Adair, British author, critic. Sunday Times: Books (London, April 21, 1991)