Electrical, mechanical and morphological properties of compressed carbon felt electrodes in vanadium redox flow battery

Chang, Tien Chan; Zhang, Jun Pu; Fuh, Yiin Kuen

doi:10.1016/j.jpowsour.2013.06.018

Cited by 94 publications

(45 citation statements)

References 22 publications

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“…In assembled RFBs the electrodes are held under compression to decrease the electrical resistance, provide sealing in the system and supply support to the membrane separator, but a detailed study of the effect of compression on the microstructure of flow battery felts has yet to be conducted, with the majority of studies either concentrating on the electrochemical performance only, using numerical models, or employing two-dimensional techniques to study compression [20][21][22][23][24] . Transport properties of porous materials are strongly linked to their microstructure, and detailed investigation of these materials in 3D is required for a full understanding of many electrochemical systems [25,26] .…”

Section: Introductionmentioning

confidence: 99%

In situ compression and X-ray computed tomography of flow battery electrodes

Jervis

Kok

Neville

et al. 2018

Journal of Energy Chemistry

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a b s t r a c tRedox flow batteries offer a potential solution to an increase in renewable energy generation on the grid by offering long-term, large-scale storage and regulation of power. However, they are currently underutilised due to cost and performance issues, many of which are linked to the microstructure of the porous carbon electrodes used. Here, for the first time, we offer a detailed study of the in situ effects of compression on a commercially available carbon felt electrode. Visualisation of electrode structure using X-ray computed tomography shows the non-linear way that these materials compress and various metrics are used to elucidate the changes in porosity, pore size distribution and tortuosity factor under compressions from 0%-90%.

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Section: Introductionmentioning

confidence: 99%

In situ compression and X-ray computed tomography of flow battery electrodes

Jervis

Kok

Neville

et al. 2018

Journal of Energy Chemistry

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“…All spectra were calibrated by the C1s peak of hydrocarbons in the binding energy of 285.0 eV. The area surface resistance (ASR) of the sample was measured by the two‐electrode method, and the test device was shown in Figure S3 . The graphite felt was cut into a block with a length of 3 cm and a width of 3 cm, which was sandwiched between two graphite plates (2 mm).…”

Section: Methodsmentioning

confidence: 99%

“…The area surface resistance (ASR) of the sample was measured by the two-electrode method, and the test device was shown in Figure S3. [53] The graphite felt was cut into a block with a length of 3 cm and a width of 3 cm, which was sandwiched between two graphite plates (2 mm). The final thickness of the graphite felt was set with a Teflon (PTFE) frame by fixing them with bolts.…”

Section: Materials Characterizationmentioning

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 electrode thickness also plays a significant role in the electrochemical performance [22] and the pressure drop in the cell [23], which can be modulated by abutting multiple single electrode layers. Finally, studies in the electrode porosity and permeability reveal connections to the peak power [24], accessible energy density [25], energy efficiency [25][26][27][28], and fluid dynamics [29]. Indeed, the electrode structure-performance relationship can be elucidated with systematic experimental analyses; however, these campaigns can be time-, labor-, and resource-intensive.…”

Section: Introductionmentioning

confidence: 99%

Integrated Numerical and Experimental Data-Driven Parameter Identification of Electrode Properties in All-Vanadium Redox Flow Batteries

Cheng¹,

Tenny²,

Pizzolato³

et al. 2020

Preprint

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The vanadium redox flow battery (VRFB) is a promising energy storage technology for stationary applications (e.g., renewables integration) that offers a pathway to cost-effectiveness through independent scaling of power and energy as well as longevity. Many current research efforts are focused on improving battery performance through electrode modifications, but high-throughput, laboratory-scale testing can be time- and material-intensive. Advances in multiphysics-based numerical modeling and data-driven parameter identification afford a computational platform to expand the design space by rapidly screening a diverse array of electrode configurations. Herein, a 3D VRFB model is first developed and validated against experimental results. Subsequently, a new 2D model is composed, yielding a computationally light simulation framework, which is used to generate a dataset of 16800 electrode property combinations under four different cell voltages to track the impact of different structural parameters on the cell current density. These structure-performance relationships are quantified using Kendall $\tau$ rank correlation coefficients to highlight the dependence of cell performance on bulk electrode morphology and to identify improved property sets. This statistical framework may serve as a general guideline for parameter identification for more advanced electrode designs.

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Electrical, mechanical and morphological properties of compressed carbon felt electrodes in vanadium redox flow battery

Cited by 94 publications

References 22 publications

In situ compression and X-ray computed tomography of flow battery electrodes

In situ compression and X-ray computed tomography of flow battery electrodes

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

Integrated Numerical and Experimental Data-Driven Parameter Identification of Electrode Properties in All-Vanadium Redox Flow Batteries

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