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Thesis
Investigation of electrode materials for an electrochemical flow capacitor
Master of Science (M.S.), Drexel University
Dec 2012
DOI:
https://doi.org/10.17918/etd-4032
Abstract
A recently introduced electrical energy storage concept, the electrochemical flow capacitor (EFC), holds much promise for grid-scale energy storage applications. The EFC utilizes the principles behind the operation of flow batteries and supercapacitors, and enables rapid charging/discharging and decoupled energy/power ratings. Electrical charge is stored in a flowable carbon slurry composed of low-cost and abundant carbon in neutral, aqueous electrolyte. Charge storage and transfer is analogous to solid carbon electrodes in conventional supercapacitors. Here, the effects of carbon particle solid fraction, shape and size on the electrochemical and flow properties of slurry electrodes are investigated. A static cell configuration is utilized for studying the electrochemical properties of the flowable electrodes. The electrochemical properties of the slurry electrodes tested in a static cell are found to be similar to that of solid electrodes in conventional supercapacitors for large spherical and commonly used anisometric activated carbons. Flow properties of the slurry electrodes are obtained for shear rates corresponding to pumping shear rates by rheometry. The results indicate that electrochemical and rheological properties of slurries depend on their concentration and also shape and size of the carbon particles used in the slurries. For a range of concentrations, slurries based on spherical carbon particles show lower viscosities compared to anisometric activated carbon based slurries while performing similar electrochemically.
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Details
- Title
- Investigation of electrode materials for an electrochemical flow capacitor
- Creators
- Jonathan William Campos - DU
- Contributors
- Yury Gogotsi (Advisor) - Drexel University (1970-)Emin C. Kumbur (Advisor) - Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- Chemical (and Biological) Engineering [Historical]; College of Engineering (1970-2026); Drexel University
- Other Identifier
- 4032; 991014632563204721