Visualization of electrolyte flow in vanadium redox flow batteries using synchrotron X-ray radiography and tomography – Impact of electrolyte species and electrode compression

Bevilacqua, Nico; Eifert, László; Banerjee, Rupak; Köble, Kerstin; Faragó, Tomáš; Zubér, M. S.; Bazylak, Aimy; Zeis, Roswitha

doi:10.1016/j.jpowsour.2019.227071

Cited by 46 publications

(40 citation statements)

References 42 publications

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“…The pore-level, mass-transport coefficient was found to be independent of the current density. In addition, it is worth mentioning that several modelling efforts were dedicated to addressing the effects of compression and other mechanical conditions on effective transport properties, [287][288][289][290] even via the development of coupled electrochemical-mechanical models. 291 Xu et al developed a 2D mass-transport and electrochemical model for a VRFB that accounted for the effect of SOCdependent electrolyte viscosity.…”

Section: Modelling For Vrfb and Similar Aqueous-based Systemsmentioning

confidence: 99%

Modelling of redox flow battery electrode processes at a range of length scales: a review

Chakrabarti

Kalamaras

Singh

et al. 2020

Sustainable Energy Fuels

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Section: Modelling For Vrfb and Similar Aqueous-based Systemsmentioning

confidence: 99%

Modelling of redox flow battery electrode processes at a range of length scales: a review

Chakrabarti

Kalamaras

Singh

et al. 2020

Sustainable Energy Fuels

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“…In a wide range of production methods, the structure development occurs rather randomly under uncontrolled conditions [40]. Secondly, the softer materials, such as felt or foam, are very often compressed inside the technical equipment, resulting in a gradient of pore sizes [41,42]. On the other hand, it is of interest to assess how controlled grading of the pore structure can influentially impact the improvement of the overall transport kinetics of porous materials.…”

Section: Introductionmentioning

confidence: 99%

Computational Optimization of Porous Structures for Electrochemical Processes

et al. 2020

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Porous structures are naturally involved in electrochemical processes. The specific architectures of the available porous materials, as well as their physical properties, crucially affect their applications, e.g., their use in fuel cells, batteries, or electrolysers. A key point is the correlation of transport properties (mass, heat, and charges) in the spatially—and in certain cases also temporally—distributed pore structure. In this paper, we use mathematical modeling to investigate the impact of the pore structure on the distribution of wetting and non-wetting phases in porous transport layers used in water electrolysis. We present and discuss the potential of pore network models and an upscaling strategy for the simulation of the saturation of the pore space with liquid and gas, as well as the computation of the relative permeabilities and oxygen dissolution and diffusion. It is studied how a change of structure, i.e., the spatial grading of the pore size distribution and porosity, change the transport properties. Several situations are investigated, including a vertical gradient ranging from small to large pore sizes and vice versa, as well as a dual-porosity network. The simulation results indicate that the specific porous structure has a significant impact on the spatial distribution of species and their respective relative permeabilities. In more detail, it is found that the continuous increase of pore sizes from the catalyst layer side towards the water inlet interface yields the best transport properties among the investigated pore networks. This outcome could be useful for the development of grading strategies, specifically for material optimization for improved transport kinetics in water electrolyser applications and for electrochemical processes in general.

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“…To enable the imaging of the electrodes, the material selection was made with the aim to minimize radiation absorption. Similarly, Bevilacqua et al [178] utilized X-ray visualization to investigate the effect of thermal treatment of the porous electrode on the wetting properties, saturation and changes in the electrochemically active surface area.…”

Section: Imaging Techniquesmentioning

confidence: 99%

In-Situ Tools Used in Vanadium Redox Flow Battery Research—Review

Ghimire¹,

Bhattarai²,

Lim

et al. 2021

Batteries

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Progress in renewable energy production has directed interest in advanced developments of energy storage systems. The all-vanadium redox flow battery (VRFB) is one of the attractive technologies for large scale energy storage due to its design versatility and scalability, longevity, good round-trip efficiencies, stable capacity and safety. Despite these advantages, the deployment of the vanadium battery has been limited due to vanadium and cell material costs, as well as supply issues. Improving stack power density can lower the cost per kW power output and therefore, intensive research and development is currently ongoing to improve cell performance by increasing electrode activity, reducing cell resistance, improving membrane selectivity and ionic conductivity, etc. In order to evaluate the cell performance arising from this intensive R&D, numerous physical, electrochemical and chemical techniques are employed, which are mostly carried out ex situ, particularly on cell characterizations. However, this approach is unable to provide in-depth insights into the changes within the cell during operation. Therefore, in situ diagnostic tools have been developed to acquire information relating to the design, operating parameters and cell materials during VRFB operation. This paper reviews in situ diagnostic tools used to realize an in-depth insight into the VRFBs. A systematic review of the previous research in the field is presented with the advantages and limitations of each technique being discussed, along with the recommendations to guide researchers to identify the most appropriate technique for specific investigations.

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Visualization of electrolyte flow in vanadium redox flow batteries using synchrotron X-ray radiography and tomography – Impact of electrolyte species and electrode compression

Cited by 46 publications

References 42 publications

Modelling of redox flow battery electrode processes at a range of length scales: a review

Modelling of redox flow battery electrode processes at a range of length scales: a review

Computational Optimization of Porous Structures for Electrochemical Processes

In-Situ Tools Used in Vanadium Redox Flow Battery Research—Review

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