For organic redox flow batteries (ORFBs), it is of significance to clarify the influence mechanism of their electrode configuration on the mass transfer inside electrodes and battery performance. A novel three-dimensional (3D) numerical model for ORFBs is established based on the Nernst–Planck and Butler–Volmer theories and is verified by numerous experiments for both the charge and discharge processes. ORFBs equipped with rectangular, trapezoidal, and sector electrodes are investigated, in which the voltage, overpotentials, uniformity factor, and the power efficiency of the discharge process are presented. The results show that the sector electrode possesses the best mass transfer and battery performance. The power-based efficiency of the sector electrode is 1% higher than that of the trapezoidal one. In addition, the opening angle of the sector electrode should be as small as possible. The optimal aspect ratio of the rectangular electrode is 60:107, and the optimal configuration of the trapezoidal electrode is 30 mm top side length and 130 mm bottom side length. The optimization of the porous electrode configuration is presented, which can contribute to the commercial application of ORFBs.

The high energy consumption of MEA regeneration process is the biggest challenge for the application of CO2 capture by the monoethanolamine (MEA) solution. Therefore, it is of significance to determine...

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The organic flow battery is one of most potential electrochemical energy storage technologies due to the huge potential and cheap. The mass transfer performance is one of the main barriers to limit the development. The species distribution and transport process in the electrode is influenced by the geometric characteristic of electrode. A novel numerical model for the organic redox flow battery(ORFB) is built, and this model is verified by the experiments. The results show that the mass transfer and battery performances are influenced by the electrode thickness significantly. Taking the ohmic loss into consideration, the optimal electrode thickness is 1.5 mm. The rising of electrode channel depth significantly reduces the discharge voltage. When the channel depths is 4 mm, the uniformity factor is lowest. The rising of the initial concentration can promote the battery performance and uniformity factor. The positive active species concentration leads to the bigger influence. This work can contribute to the industrial application of the organic flow battery.