A comprehensive study of electrode compression effects in all vanadium redox flow batteries including locally resolved measurements

Ghimire, Purna C.; Bhattarai, Arjun; Schweiss, Ruediger; Scherer, Günther G.; Wai, Nyunt; Yan, Qingyu

doi:10.1016/j.apenergy.2018.09.049

Cited by 65 publications

(51 citation statements)

References 25 publications

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“…Electrode mixers are 3D shaped conductive structures that enhance mass transport towards the electrode by reducing concentration polarization at the electrode due to its mixing properties. As a result, the electrochemical community is more and more looking at 3D electrodes to enhance the mass transfer in electrochemical processes, such as batteries or redox flow batteries ,. However, fabrication of such structures at reasonable cost without a complicated synthesis protocol avoiding expensive machines is to date still a pressing problem especially when targeting all‐metal structures.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the electrochemical community is more and more looking at 3D electrodes to enhance the mass transfer in electrochemical processes, such as batteries [7][8][9][10][11] or redox flow batteries. [12,13] However, fabrication of such structures at reasonable cost without a complicated synthesis protocol avoiding expensive machines is to date still a pressing problem especially when targeting all-metal structures. This inhibits experimental testing in a fast prototyping way.…”

Section: Introductionmentioning

confidence: 99%

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Indirect 3D Printed Electrode Mixers

et al. 2018

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Electrode mixers are ordered 3D flow‐through structures with mixing properties that at the same time act as electrode. Because of their mixing properties, these structures enhance mass transfer at the electrode surface, increasing the limiting‐current plateau. Typically operating at this plateau, the productivity of electrochemical reactors is limited by the mass transport of the reagents. This work presents the fabrication of all‐metal electrode mixers through an indirect 3D printing method. Whereas other techniques suffer from design limitations or come with high capital cost, the proposed rapid prototyping method overcomes these limitations. Using this method, a helical and a cubic electrode mixer was fabricated and their mass transfer properties were characterized and compared to a flat electrode by the limiting current method. Increasing the mass transfer up to 47 % the standard flat electrode is outperformed, demonstrating the valorization potential of electrode mixers and the indirect 3D printing method.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Indirect 3D Printed Electrode Mixers

et al. 2018

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“…Howbeit the mass transfer of the graphite felts to the electrolyte is also reduced. Therefore, under the balance of these two effects, it is necessary to optimize the compression ratio of the graphite felts . It is noticeable that the transport process of electrons depends largely on the electrical conductivity of the graphite felt itself.…”

Section: Resultsmentioning

confidence: 99%

Polarization Effects of a Rayon and Polyacrylonitrile Based Graphite Felt for Iron‐Chromium Redox Flow Batteries

et al. 2019

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In this paper, a rayon based graphite felt (R‐GF) and a polyacrylonitrile based graphite felt (PAN‐GF) are studied to clarify the influence of the precursor on the polarization effect from three aspects: concentration polarization, ohmic polarization, and electrochemical polarization. The essential difference in chemical structure between R‐GF and PAN‐GF is that the precursor material makes PAN‐GF easier to be graphitized. The higher degree of graphitization leads to a higher conductivity of PAN‐GF. At the same thickness and porosity, the conductivity of PAN‐GF is higher and the loss of ohmic polarization is smaller. These factors make PAN‐GF have better electrocatalytic properties and kinetic reversibility in the Fe/Cr electrolyte environment. While the surface roughness of R‐GF is larger, which is contributing to the diffusion and surface mass transfer of the electrolyte on the surface. The effect of precursor on the concentration polarization of R‐GF and PAN‐GF is related to the surface mass transfer, which ultimately affects the performance of ICRFB.

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“…The electrical resistance test results for different IEBP samples are shown in Figure B. It can be seen that the area‐averaged electrical resistance of IEBPs decreases with increasing compaction pressure, which is consistent with the trend of the reference . Comparing the three curves of A, B, and C, it can be seen that the influence of sintering temperature on the electrical resistance of IEBPs is obvious.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with the performance of the battery with an electrode compression of 20% (γ = 0.2), the charge and discharge capacities of the two batteries are almost equal but the polarization of the battery with IEBP is lower. The reason is that the permeability and specific surface area of the porous electrode decrease with the compression of the electrode . The permeability of the porous electrode affects the fluidity of the electrolyte.…”

Section: Resultsmentioning

confidence: 99%

High‐temperature conductive binder for an integrated electrode bipolar plate and its application in vanadium redox flow battery

2019

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Summary A high‐temperature conductive binder for preparing an integrated electrode bipolar plate (IEBP) was proposed. The electrical resistance and stability of IEBP samples with different component proportions were tested after treated at different temperatures. The results showed that the mass ratio of phenolic resin, graphite powder, B4C, and SiO2 in the conductive binder was 1:0.5:0.5:0.1, and the IEBP prepared by it had the lowest electrical resistance and the highest stability in vanadium solution after treated at 800°C. The characterization results of thermogravimetry‐differential scanning calorimetry (TG‐DSC), X‐ray diffraction (XRD), Fourier transformed infrared radiation (FTIR), and scanning electron microscope (SEM) indicated that the bonding strength was closely related to the formation of borosilicate glass and the volume compensation from B4C's oxidation. The battery with IEBP had better performance than those with no binder, and it operated well at a current density up to 150 mA cm−2. Furthermore, the battery with IEBP had a stable cycling performance and the IEBP remained integrated after up to 100 charge‐discharge cycles.

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A comprehensive study of electrode compression effects in all vanadium redox flow batteries including locally resolved measurements

Cited by 65 publications

References 25 publications

Indirect 3D Printed Electrode Mixers

Indirect 3D Printed Electrode Mixers

Polarization Effects of a Rayon and Polyacrylonitrile Based Graphite Felt for Iron‐Chromium Redox Flow Batteries

High‐temperature conductive binder for an integrated electrode bipolar plate and its application in vanadium redox flow battery

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