Journal article
Role of convection and related effects on species crossover and capacity loss in vanadium redox flow batteries
Electrochemistry communications, v 23(1), pp 76-79
01 Sep 2012
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
This study reports important observations regarding the convective transport through the membrane and related effects on the species crossover and the capacity loss in vanadium redox flow batteries (VRFBs). A 2-dimensional, isothermal, transient model is utilized to simulate several extended charge/discharge cycles with varying flow rates and electrolyte viscosities. The simulations indicate that osmotic and electro-osmotic convections in the membrane are major mechanisms contributing to species crossover. In addition, variations in electrolyte viscosity are observed to have a significant impact on the direction and magnitude of species crossover during VRFB operation. Finally, the simulations suggest that one potential approach to minimize the capacity loss in VRFBs would be to operate the system at constant pressure condition through the utilization of asymmetric flow rates (i.e. different flow rates in the '+' and '-' half-cells) to reduce the impact of osmotic convection. (C) 2012 Elsevier B.V. All rights reserved.
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Details
- Title
- Role of convection and related effects on species crossover and capacity loss in vanadium redox flow batteries
- Creators
- K. W. Knehr - Drexel UniversityE. C. Kumbur - Drexel University
- Publication Details
- Electrochemistry communications, v 23(1), pp 76-79
- Publisher
- Elsevier
- Number of pages
- 4
- Grant note
- 235638 / National Science Foundation Research Experience for Undergraduates; National Science Foundation (NSF) 001389-002 / Ben Franklin Technology Partnership of Southeastern Pennsylvania - Energy Commercialization Institute
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000309897800020
- Scopus ID
- 2-s2.0-84865613024
- Other Identifier
- 991019169692204721
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- Web of Science research areas
- Electrochemistry