Abstract
In this study, a new monitoring method was developed, titled infrared thermal imaging technology, which can effectively evaluate the thermal effect of the charge-discharge test in the vanadium/iodine redox flow battery (V/I RFB). The results show that the all-vanadium redox flow battery (all-V RFB) has a greater molar reaction Gibbs free energy change than that of the V/I RFB, representing a large thermal effect of the all-V RFB than the V/I RFB. The charge-discharge parameters, flow rate and current density, are important factors for inducing the thermal effect, because of the concentration polarization and the ohmic resistor. The new membrane (HS-SO3H) shows a high ion exchange capacity and a good ions crossover inhibitory for the V/I RFB system, and has a high coulomb efficiency that reaches 96%. The voltage efficiency was enhanced from 61% to 86% using the C-TiO2-Pd composite electrode as a cathode with the serpentine-type flow field for the V/I RFB. By adopting the high-resolution images of an infrared thermal imaging technology with the function of the temperature profile data, it is useful to evaluate the key components’ performance of the V/I RFB, and is a favorable candidate in the developing of the redox flow battery system.
Highlights
The redox flow battery (RFB) generates heat when consuming the electric power in its working state, and that will transfer into a thermal form emitted from the normal or abnormal state
Charge-Discharge Performances and Thermal Effect of All-V RFB and vanadium/iodine redox flow battery (V/I RFB) Systems. Both the all-V RFB and V/I RFB are redox flow batteries where the electrolytes circulate between two half-cell electrolytic cells and the storage tanks
The all-V RFB system presents a higher EE% (62%) than that of the V/I RFB (57%), because the V/I RFB shows a lower VE% (61%); it shows a higher coulombic efficiency (CE)% (93%) and a discharge capacity (495 mAh) than of that of the all-V RFB (79%) and (416 mAh). This means that all-V RFBs experience crossover and no cross contamination, less are shown for the V/I RFB
Summary
The redox flow battery (RFB) generates heat when consuming the electric power in its working state, and that will transfer into a thermal form emitted from the normal or abnormal state. In the low concentration of sulfuric acid, the V/I RFB can efficiently improve the corrosion problem of the flow channel and the electrode for a longer working period This V/I RFB has low costs, and exhibits good potential for applications in the energy storage systems. A novel real-time monitoring by the ITI technology is used to monitor the thermal effects, and to measure thermodynamic quantities for the RFB reactions in the charge-discharge cycles by modifying the key materials and parameters for this V/I RFB. The ITI with high-resolution images and the function of the temperature profile data can detect a certain area of the temperature change, whereby the analysis can effectively identify the real hot spots, and make further improvements for the RFB system’s design
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