A Tubular Electrochemical Reactor for Slurry Electrodes. Issue 12 (25th June 2020)

• Record Type: Journal Article
• Authors: Percin, Korcan; Zoellner, Oliver; Rall, Deniz; Wessling, Matthias
• Is Part Of: ChemElectroChem. Volume 7:Issue 12(2020)
• Page Start: 2665
• Page End: 2671
• Publication Date: 2020-06-25
• Subjects: tubular -- redox flow battery -- vanadium -- slurry electrode -- conductive static mixer; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202000616
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: The research on electrochemical reactors is mostly limited to planarly designed modules. In this study, we compare a tubular and a planar electrochemical reactor for the utilization of the slurry electrodes. Cylindrical formed geometries demonstrate a higher surface‐to‐volume ratio, which may be favorable in terms of current density and volumetric power density. A tubular shaped electrochemical reactor is designed with conductive static mixers to promote the slurry particle mixing, and the vanadium redox flow battery is selected as a showcase application. The new tubular design presents similar cell resistances to the previously designed planar battery and shows increased discharge polarization behavior up to 100 mA cm −2 . The volumetric power density reaches up to 30 mW cm −3, which is two times higher than that of the planar one. The battery performance is further investigated and 85 % coulombic, 70 % voltage and 60 % energy efficiency is found at 15 mA cm −2 with 15 wt.% slurry content. Abstract : Geometry matters : We designed a tubular shaped electrochemical reactor for slurry electrodes. The tubular reactor is used in a vanadium redox flow system as a showcase study. The tubular reactor achieves higher power density in comparison to a standard planar electrochemical reactor.