NASA redox storage system development project
The operating temperature was raised from 25 C to 65 C, which enhanced the kinetics of the chromium electrode charging reactions. The design of the auxiliary electrochemical cell, which is used to keep both reactants at the same state of charge, was modified, leading to better and more stable performance. Preliminary testing has shown that the four tank mode of operation improves energy efficiency as much as 5 percentage points over the conventional two tank mode. Another variation in operating mode, the use of mixed reactants, potentially offers several very attractive advantages. Preliminary reactant cost studies lend further weight to the feasibility of the mixed reactant concept. Electrode studies show that reproducibility of performance is very dependent on the pyrolysis temperature at which the carbon/graphite felt substrate is formed. Membrane development work continued to concentrate on cost reduction and the enhancement of resistivity and selectivity.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- OSTI ID:
- 5403392
- Report Number(s):
- N-8326252; NASA-TM-83087; E-1546
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
300501* -- Fuel Cells-- Design & Development
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
COST
DESIGN
DIRECT ENERGY CONVERTERS
EFFICIENCY
ELECTROCHEMICAL CELLS
ELECTRODES
ENERGY EFFICIENCY
FUEL CELLS
MEDIUM TEMPERATURE
OPERATION
PERFORMANCE
REDOX FUEL CELLS
REDOX REACTIONS
REGENERATIVE FUEL CELLS
TEMPERATURE EFFECTS
TRANSITION ELEMENT COMPOUNDS