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Pressure drop through platinized titanium porous electrodes for cerium‐based redox flow batteries
Author(s) -
Arenas Luis F.,
Ponce de León Carlos,
Walsh Frank C.
Publication year - 2018
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16000
Subject(s) - pressure drop , electrolyte , titanium , flow battery , materials science , electrode , redox , electrochemistry , sherwood number , turbulence , porosity , reynolds number , analytical chemistry (journal) , chemistry , composite material , thermodynamics , metallurgy , chromatography , nusselt number , physics
The pressure drop, Δ P , across a redox flow battery is linked to pumping costs and energy efficiency, making fluid properties of the electrolyte important in scale‐up operations. The Δ P at diverse platinized titanium electrodes in Ce‐based redox flow batteries is reported as a function of mean linear electrolyte velocity measured in a rectangular channel flow cell. Darcy's friction factor and permeability vs. Reynolds number are calculated. Average permeability values are: 7.10 × 10 −4 cm 2 for Pt/Ti mesh, 4.45 × 10 −4 cm 2 for Pt/Ti plate + turbulence promoters, 1.67 × 10 −5 cm 2 for Pt/Ti micromesh, and 1.31 × 10 −6 cm 2 for Pt/Ti felt. The electrochemical volumetric mass transport coefficient,k mA e , is provided as a function of Δ P . In the flow‐by configuration, Pt/Ti felt combines highk mA evalues with a relatively high Δ P , followed by Pt/Ti micromesh. Pt/Ti mesh and Pt/Ti plate gave a lower Δ P but poorer electrochemical performance. Implications for cell design are discussed. © 2017 American Institute of Chemical Engineers AIChE J , 64: 1135–1146, 2018