Variable Porous Electrode Compression for Redox Flow Battery Systems
Abstract
:1. Introduction
2. Results
2.1. Reactant Concentration and Limiting Current Density
2.2. Effect of Cell Dimensions
3. Discussion
4. Materials and Methods
Author Contributions
Funding
Conflicts of Interest
References
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Case | Geometry | Electrode Compression | Min. V3+ Concentration (mol m−3) | Min. Limiting Current (mA cm−2) | Differential Pressure (kPa) | Cell Voltage (V) |
---|---|---|---|---|---|---|
1 | Uniform | 0% | 0 | 0 | 0.23 | 1.92 |
2 | Uniform | 15% | 46 | 17 | 1.48 | 1.72 |
3 | Uniform | 30% | 110 | 43 | 2.88 | 1.59 |
4 | Reducing | 0 to 30% | 58 | 23 | 1.43 | 1.69 |
Dependent Variable | Improvement |
---|---|
Minimum V3+ Concentration (mol m−3) | 25% |
Minimum Limiting Current (mA cm−2) | 36% |
Differential Pressure (kPa) | 3% |
Cell Voltage (V) | 1% |
Thickness | Compression | Conductivity | Porosity | |
---|---|---|---|---|
mm | mm | % | S/m | |
4.0 | 0.0 | 0% | 5.9 | 0.95 |
3.6 | 0.4 | 10% | 14.3 | 0.90 |
3.2 | 0.8 | 20% | 20.0 | 0.89 |
2.8 | 1.2 | 30% | 50.0 | 0.87 |
Parameter | Symbol | Value | Unit |
---|---|---|---|
Inlet velocity | 26 × 10−3 | m/s | |
Outlet pressure | 0 | Pa | |
Temperature | 280 | K | |
Current density | 1600 | A m−2 | |
State of Charge | 90 | - | |
Cell width | 0.05 | m | |
Cell length | 0.08 | m | |
Membrane thickness | 0.123 × 10−3 | m |
Parameter | Symbol | Value | Unit |
---|---|---|---|
Dynamic viscosity (negative electrolyte) | 0.0025 | Pa s | |
Dynamic viscosity (positive electrolyte) | 0.005 | Pa s | |
Density (negative electrolyte) | 1300 | kg m−3 | |
Density (positive electrolyte) | 1350 | kg m−3 | |
Mean pore radius | 50.3 × 10−6 | m | |
Kozeny-Carman constant | 180 | – |
Parameter | Symbol | Value | Unit |
---|---|---|---|
V2+ diffusion coefficient | 2.4 × 10−10 | m2 s−1 | |
V3+ diffusion coefficient | 2.4 × 10−10 | m2 s−1 | |
VO2+ diffusion coefficient | 3.9 × 10−10 | m2 s−1 | |
VO2+ diffusion coefficient | 3.9 × 10−10 | m2 s−1 | |
Proton diffusion coefficient | 9.312 × 10−9 | m2 s−1 | |
Initial vanadium concentration | 1500 | mol m−3 | |
Initial proton concentration (negative) | 4500 | mol m−3 | |
Initial proton concentration (positive) | 6000 | mol m−3 | |
Standard reaction rate constant (negative) | 1.7 × 10−7 | m s−1 | |
Standard reaction rate constant (positive) | 6.8 × 10−7 | m s−1 | |
Anodic transfer coefficient | 0.5 | – | |
Cathodic transfer coefficient | 0.5 | – | |
Equilibrium potential: V2+/V3+ | −0.255 | V | |
Equilibrium potential: VO2+/VO2+ | 1.004 | V |
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Gurieff, N.; Timchenko, V.; Menictas, C. Variable Porous Electrode Compression for Redox Flow Battery Systems. Batteries 2018, 4, 53. https://doi.org/10.3390/batteries4040053
Gurieff N, Timchenko V, Menictas C. Variable Porous Electrode Compression for Redox Flow Battery Systems. Batteries. 2018; 4(4):53. https://doi.org/10.3390/batteries4040053
Chicago/Turabian StyleGurieff, Nicholas, Victoria Timchenko, and Chris Menictas. 2018. "Variable Porous Electrode Compression for Redox Flow Battery Systems" Batteries 4, no. 4: 53. https://doi.org/10.3390/batteries4040053