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Min-Young Kim et al. / J. Electrochem. Sci. Technol., 2021, 12(3), 330-338 333 The tensile shear test is to measure the gripping strength of substrate by adhesive material as a load is applied to both ends of specimen. Herein, the shear strength was measured when electrode was pulled up from the bipolar plate-electrode assembly. In order to fabricate VRB using an integrated bipo- lar plate and electrode assembly, the thickness of the bipolar plate is 3 mm, and the thickness and area of the electrode are 5.5 mm, and 25 cm2, respectively. Nafion 117 is used as a separator, and copper plates are placed at both ends as current collectors. The assembled VRBs were pressed with compact pres- sure of 11.12 kgf/cm2, respectively. The composition of the electrolyte solution of VRB was a mixture of 1.6 M VOSO4 and 2.5 M H2SO4. The amount of the electrolyte was 50 ml, and the flow rate was 30 mL min-1. The charge/discharge test of VRB single cell was conducted between 1.0 and 1.6 V at the room temperature, in which the cell was charged at con- stant current density (40 mA cm-2) to 1.6 V, kept at 1.6 V until 10 mA cm-2 and then discharged at con- stant current density (40 mA cm-2) to 1.0 V using a Fig. 4. Chemical stability of EVA film in electrolyte: each of electrolyte and EVA sheet before test (a), and after test (b). Fig. 5. Surface morphology of each adhesive film by optical microscope and SEM: bare EVA film (a, b), CB-EVA film (c, d), CNT-EVA film (e, f).PDF Image | Energy Efficiency Improvement of Vanadium Redox Flow Battery
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