Pressure drop through platinized titanium porous electrodes for cerium‐based redox flow batteries |
| |
| Authors: | Luis F. Arenas Carlos Ponce de León Frank C. Walsh |
| |
| Affiliation: | Electrochemical Engineering Laboratory, Energy Technology Group, Dept. of Mechanical Engineering, University of Southampton, Southampton SO17 1BJ, U.K. |
| |
| Abstract: | The pressure drop,  , 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  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 cm2 for Pt/Ti mesh, 4.45 × 10?4 cm2 for Pt/Ti plate + turbulence promoters, 1.67 × 10?5 cm2 for Pt/Ti micromesh, and 1.31 × 10?6 cm2 for Pt/Ti felt. The electrochemical volumetric mass transport coefficient,  , is provided as a function of  . In the flow‐by configuration, Pt/Ti felt combines high  values with a relatively high  , followed by Pt/Ti micromesh. Pt/Ti mesh and Pt/Ti plate gave a lower  but poorer electrochemical performance. Implications for cell design are discussed. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1135–1146, 2018 |
| |
| Keywords: | cerium electrochemical flow reactor platinized titanium porous electrode pressure drop redox flow battery |
|
|
, 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 
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 cm2 for Pt/Ti mesh, 4.45 × 10?4 cm2 for Pt/Ti plate + turbulence promoters, 1.67 × 10?5 cm2 for Pt/Ti micromesh, and 1.31 × 10?6 cm2 for Pt/Ti felt. The electrochemical volumetric mass transport coefficient, 
, is provided as a function of 
. In the flow‐by configuration, Pt/Ti felt combines high 
values with a relatively high 
, followed by Pt/Ti micromesh. Pt/Ti mesh and Pt/Ti plate gave a lower 
but poorer electrochemical performance. Implications for cell design are discussed. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1135–1146, 2018