A kilo-Watt-class direct sodium-borohydride/hydrogen-peroxide (NaBH4/H2O2) fuel cell is fabricated and characterized in this research. Aqueous solution of NaBH4 is directly utilized at the fuel cell anode in place of gaseous hydrogen. Similarly H2O2/water solution is directly reduced at the cathode without being first converted through molecular oxygen. The direct utilization of fuel/oxidant results in much higher (35% higher) efficiency in energy utilization. The potential for a very high efficiency (over 80%) was fully validated in the experiments, because the use of H2O2 overcomes the oxygen over-potential problem inherent to prior H2/O2 fuel cell designs. Initial results indicate: 1) conversion efficiency over 50% at a practical current density of 200 mA/cm2; 2) power density over 0.5 W/cm2, at 60 degree Celsius. The kilo-Watt-stack consists of 24 cells, generating an OCV (open circuit voltage) of ∼ 42 V. The design of the reactant manifold overcomes some issues unique to an all-liquid-reactant fuel cell. Such a technology is ideal for propulsion/power in air independent environment such as space and underwater.
- Nanotechnology Institute
A kW-Class NaBH4/H2O2 Fuel Cell for Air Independent Propulsion
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Luo, N, Miley, GH, Mather, J, Burton, R, Hawkins, G, Byrd, E, Holcomb, F, & Rusek, J. "A kW-Class NaBH4/H2O2 Fuel Cell for Air Independent Propulsion." Proceedings of the ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASME 2006 Fourth International Conference on Fuel Cell Science, Engineering and Technology, Parts A and B. Irvine, California, USA. June 19–21, 2006. pp. 333-338. ASME. https://doi.org/10.1115/FUELCELL2006-97207
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