M4-NUWC Overview Fontaine.pdf
M4-NUWC Overview Fontaine.pdf M4-NUWC Overview Fontaine.pdf
Reaction Chemistries: Direct Electro oxidation/reduction 1. Alkaline Anolyte and Catholyte Anode BH 4 - Cathode HO 2 - + 8OH - � + H2O + 2e- Overall 4HO 2 - + BH4 - � BO 2 - � + 6H2O + 8e- 3OH - 2. Alkaline Anolyte / Acid Catholyte Anode BH 4 - Cathode 4H2O2 + 8OH - + 8H + � Overall 4HO 2 - + BH4 - � + 8e - BO 2 - � 1.24 V 0.87 V BO 2 - + 2H2 O + 4OH - 2.11 V + 6H2O + 8e- 8H2O 1.24 V 1.77 V BO 2 - + 2H2 O + 4OH - 3.01 V Key to this chemistry is to minimize the amount of caustic and acid needed to preserve the two pH levels of the respective electrolytes. Use of an anion exchange membrane or bi-polar membrane may be the key enabler but electro-osmotic drag will be difficult to compensate for.
Oxidation of BH 4 - Anode BH 4 - Reaction Chemistries: / Reduction of O 2 via H 2 + 8OH - � BO 2 - O 2 3. Alkaline Anolyte and Catholyte Cathode 2O 2 + 4H2O + 8e- Overall 2O 2 + BH 4 - � � + 6H2O + 8e- 8OH - decomposition 1.24 V 0.41 V BO 2 - + 2H2 O + 4OH - 1.64 V 4. Alkaline Anolyte / Acid Catholyte Anode BH 4 - Cathode 2O 2 + 8OH - + 8H + Overall 2O 2 + BH 4 - � � + 8e - BO 2 - � + 6H2O + 8e- 4H2O 1.24 V 1.23 V BO 2 - + 8H2 O 2.47 V
- Page 1 and 2: Advanced Unmanned Undersea Vehicle
- Page 3 and 4: • Joint / Coalition Battlespace M
- Page 5 and 6: Science and Technology for: Shock A
- Page 7 and 8: • • Propulsion and Energy Thrus
- Page 9 and 10: Advanced Air-Independent Energy Sol
- Page 11 and 12: • • • Fuel Flexibility - - -
- Page 13 and 14: SOFC Stack Test Stand Versa Power S
- Page 15 and 16: Fuel Processing (Reformers) Catalyt
- Page 17 and 18: • • 30-Cell NUWC SOFC Lab Syste
- Page 19 and 20: • • • • In house Laboratory
- Page 21 and 22: Carbide / Hydride Fuel System CaC 2
- Page 23 and 24: • • • Summary of SOFC Effort
- Page 25: • • • NaBH 4 Objective: - / H
- Page 29 and 30: • • • Direct Borohydride Syst
- Page 31 and 32: energy density (Wh/kg) 340 320 300
- Page 33 and 34: single cell potential (V) 1.80 1.60
- Page 35 and 36: Li - Lithium-Seawater Battery Devel
- Page 37 and 38: A outlet Electrolyte Flow Reference
- Page 39 and 40: APPROACH • • • • • Fuel H
- Page 41 and 42: ONR Sponsors: • • Dr. Michele A
Oxidation of BH 4 -<br />
Anode BH 4 -<br />
Reaction Chemistries:<br />
/ Reduction of O 2 via H 2<br />
+ 8OH -<br />
�<br />
BO 2 -<br />
O 2<br />
3. Alkaline Anolyte and Catholyte<br />
Cathode 2O 2<br />
+ 4H2O + 8e- Overall 2O 2 + BH 4 - �<br />
�<br />
+ 6H2O + 8e- 8OH -<br />
decomposition<br />
1.24 V<br />
0.41 V<br />
BO 2 - + 2H2 O + 4OH - 1.64 V<br />
4. Alkaline Anolyte / Acid Catholyte<br />
Anode BH 4 -<br />
Cathode 2O 2<br />
+ 8OH -<br />
+ 8H +<br />
Overall 2O 2 + BH 4 - �<br />
�<br />
+ 8e -<br />
BO 2 -<br />
�<br />
+ 6H2O + 8e- 4H2O 1.24 V<br />
1.23 V<br />
BO 2 - + 8H2 O 2.47 V
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