Improved Vanadium Redox Flow Battery Performance through a Pulsating Electrolyte Flow Regime

• DOI: 10.1149/ma2023-021135mtgabs
• Publication Date: 2024-02-08T19:10:15Z
• Authors: Renée De Wolf; Michiel De Rop; Jonas Hereijgers
• Keywords: Flow battery

The increase in emissions of greenhouse gases and their environmental impact lead to a transition from primarily fossil fuel-based energy sources renewable eco-friendly ones, such as solar panels wind turbines. However, these are intermittent, resulting fluctuating production levels that require buffering, which poses significant challenges matching production-consumption profiles. [1,2] In order stabilise the grid reduce dependency on fuels, integrating electrical carriers into smart store excess produced during peak periods employ it low is potential solution. Redox flow batteries hold promise this regard, storage capacity can be decoupled battery size, enabling scaled independently power output by increasing volume electrolyte. [3] contrast conventional secondary types, lead-acid or lithium-ion batteries, electrolyte redox non-stationary, inducing convective mass transport effects critical for achieving high output. work we introduced pulsations an all-vanadium battery, leading reduced stagnant boundary layer attributed shear forces. Previously, Pérez-Gallent et al. demonstrated conversion increased factor two while selectivity gains 15-20% made electrolyser introducing pulsating flow. [4] Furthermore, Vranckaert studied combined with pillar field electrodes, using well-known ferri-ferrocyanide couple, concluded average limiting current density fourfold compared working steady state regime. [5] Overall, behaviour yields enhanced transfer electroactive species local velocity through pulsations. net residence time reactants remains unchanged since has no influence overall velocity. improvement leads conversion. As clear enhancement strategies open door more efficient systems, our will first focus performance. results show improvement: discharge at 100 mA/cm 2 38.7% when applying pulse amplitude (PA) 0.4ml frequency (PF) 2.4 Hz rate 5 ml/min (Figure 1 A). surpassed performance achieved constant steady-state 25 ml/min. Therefore, fivefold reduction possible without losses, decreasing necessary pumping costs. When regarding stability operated initial fluctuations efficiency (CE), voltage (VE) (EE) were recorded. efficiencies became stable 98.4%, 70.5% 69.4% respectively, showing decline over B). This novel improved system allows take next step towards suitable green sources. [1] P. D. Lund, J. Lindgren, Mikkola, Salpakari, Renew. Sustain. Energy Rev. 2015 , 45 785–807. [2] H. Kondziella, T. Bruckner, 2016 53 10–22. E. Sánchez-Díez, Ventosa, M. Guarnieri, A. Trovò, C. Flox, R. Marcilla, F. Soavi, Mazur, Aranzabe, Ferret, Power Sources 2021 481 228804. Pérez-Gallent, Sánchez-Martínez, L. G. Geers, S. Turk, Latsuzbaia, V. Goetheer, Ind. Eng. Chem. Res. 2020 59 5648–5656. Vranckaert, Gemoets, Dangreau, K. Van Aken, Breugelmans, Hereijgers, Electrochim. Acta 2022 436 141435. Figure