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Fig. 14. Electrolyte flow velocity distributions of (a) concave-convex structure electrolyte flow velocity distribution, (b) rhombus structure electrolyte flow velocity distribution (c) wedge structure electrolyte flow velocity distribution and (d) expanded mesh structure electrolyte flow velocity distribution; (e) Velocity profile on the transversal line at different y positions on the reference x-y plane (z = 2.7 mm)
Fig. 13. Current density distributions with (a) concave-convex structure, (b) rhombus structure, (c) wedge structure and (d) expanded mesh structure
Fig. 12. Four types of channel structure I-V curves
Fig. 11. (a) H₂ distribution in cathode flow path and (b) O₂ distribution in anode flow path
Fig. 10. (a) Locations of the transversal line for study (x-y plane, z = 2.7 mm); (b) Velocity profile on the transversal line at different y positions on the reference x-y plane (z = 2.7 mm); (c) x=0 section flow velocity map; (d) y=0 section flow velocity map; (e) Electrolyte flow velocity distribution inside the electrolytic cell; (f) Flow velocity contours
Fig. 9. (a) Electrolyte current density distribution in bipolar plate concave-convex channel field; (b) Electrolyte current density contour plot
Fig. 8. Main view of electrode current density at Hz= 2.7 mm (electrode-bipolar plate contact interface)
Fig. 7. (a) Side view of the current density distribution on the electrodes inside the electrolytic cell (b) Main view of the current density distribution on the electrodes at different height interfaces
Fig. 6. (a) Side view and main view of the current density distribution of the electrolyte inside the electrolytic cell; (b) Main view of the current density distribution of the electrolyte at different heights
Fig. 5. (a) Typical polarization curves; (b) Comparison of the simulated (black line) and experimental values (red line) of current density-voltage polarization curves for alkaline water electrolyzer [45,53]
Table 3. Physical field parameters [32,45,52]
Table 2. Mesh-independence validation calculations
Fig. 4. Mesh delineation of filter press electrolyzer with concave-convex structure: (a) main view and (b) top view
Fig. 3. Electrochemical and flow multi-physics field coupling relationships
Table 1 Four types of bipolar plate flow field structure dimensions
Fig. 2. (a) The concave-convex structure flow path, (b) rhombus structure flow path, (c) wedge structure flow path and (d) expanded mesh structure flow path
Fig. 1. A semantical representation of a filter-press type alkaline water electrolysis cell
Figure 4. The electrochemical performance of PEC-500||graphite dual carbon DIBs. (a) Charge-discharge curves at 1 C. Inset is the corresponding dQ/dV curve. (b) In-situ XRD patterns of the graphite cathode in dual carbon DIBs. (c) Rate performance and (d) corresponding discharge curves. (e) Cycling performance at 10 C. (f) Photo illustration of pouch cells. (g) The long cycling performance at 5 C.
Figure 3. Li⁺ diffusion kinetics study of the PEC samples. (a-d) The GITT curves and the corresponding Li⁺ diffusion coefficients. (e) The CV curves of PEC-500 sample at various scan rates. (f) log i versus log V plots to determine b values.
Figure 2. Electrochemical performance of PEC samples. (a) CV curves at 0.4 mV·s^-1. (b) The galvanostatic charge/discharge profiles at 300 mA·g^-1. (c) The comparison of slope capacity and plateau capacity. (d) EIS plots. (e) rate capability and (f) cycle performance.

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