Publication Date

2014

Document Type

Dissertation/Thesis

First Advisor

Vanýsek, P., 1952-

Degree Name

M.S. (Master of Science)

Department

Department of Chemistry and Biochemistry

LCSH

Vanadium||Electric batteries--Design and construction||Storage batteries--Design and construction||Analytical chemistry||Inorganic chemistry

Abstract

The demand of large energy storage systems continues to increase with the development and improvement of renewable energy sources such as wind turbines and photovoltaic arrays. Electrochemical storage, or battery storage, such as lead-acid, lithium-ion, sodium based, and redox flow batteries (RFB), can be implemented for large scale energy storage. One of the most popular RFB is the all-vanadium redox flow cell (VRFB), which has a longer longevity, greater stability, and lower cost compared to other battery systems. The single metal system employs V2+/V3+ and VO 2+/VO2+ as half cells for the flow battery. But, there are still various phenomena associated with the vanadium redox flow cell that are not fully understood. Also, the limitations of this system need to be reduced in order to fully supply the demand.||To better understand the VRFB, the multiple oxidation states of vanadium were investigated using multiple methods. Ultraviolet visible spectroscopy (UV-VIS) and rotated disk electrode cyclic voltammetry (RDE CV) were used to characterize the different oxidation states. Electrochemical Impedance Spectroscopy (EIS) was employed to investigate the redox couples used in the VRFB as well as a constructed VRFB. While exploring the various oxidation states a precipitate was formed. The identity of the precipitate was determined using energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction spectroscopy (XRD).

Comments

Advisors: Petr Vanysek.||Committee members: Narayan Hosmane; Chong Zheng.

Extent

184 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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