High voltage quinone flow battery with hybrid acid and base electrolytes

dc.contributor.advisor Wenzhen Li
dc.contributor.author Torabi, Mohsen
dc.contributor.department Chemical and Biological Engineering
dc.date 2019-09-19T13:02:13.000
dc.date.accessioned 2020-06-30T03:17:41Z
dc.date.available 2020-06-30T03:17:41Z
dc.date.copyright Wed May 01 00:00:00 UTC 2019
dc.date.embargo 2019-10-16
dc.date.issued 2019-01-01
dc.description.abstract <p>Performance of an all quinone redox flow battery is enhanced via using electrolytes with</p> <p>contrasting pH on both sides of the proton exchange membrane. This performance increase</p> <p>includes elevation of the open circuit voltage by 300 mV to 1.5 V at SOC of 50% and augmentation</p> <p>of energy density by a factor of three to 20.6 Wh/Kg in reference to the previous redox flow battery</p> <p>developed earlier. The battery is able to operate at current densities up to 80 mA/cm2 and meeting</p> <p>columbic efficiency of 99.9% and energy density of 70%. Moreover, the battery with contrasting</p> <p>pH was able to operate for more than 140 hours continuously. Final system pH was similar to the</p> <p>initial system pH. Furthermore, durability of the referenced flow battery is enhanced by using this</p> <p>technique via maintaining a neutral pH on the cathode side of the flow battery comprising of</p> <p>Dihydroxy Anthraquinone and ferricyanide ion.</p> <p>Electrolyte pH might affect redox reaction of the analytes significantly. For example, redox</p> <p>potential of quinone compounds that entail protonation step in their electrochemical reaction might</p> <p>change by pH and some compounds such ferricyanide ion or TEMPO compounds might not be</p> <p>able to demonstrate reversible reactions at a specific pH. Capability of manipulation of the pH of</p> <p>each half cell independently from the other half cell can bring various advantages such as coupling</p> <p>half reactions that operate at completely different pH and affect redox potential, durability or</p> <p>energy density accordingly and such applications might even transcend the boundaries of the redox</p> <p>flow batteries.</p> <p>Half-cell characteristics of the catholyte such as redox potential, reversibility, stability and</p> <p>kinetics have been analyzed in this work while the similar aspects of the anolyte have been</p> <p>analyzed in literature. Single-cell tests for both systems have been performed and the results as</p> <p>well as the test conditions and methods are displayed. The systems include the DHAQ (pH=14)</p> <p>vs Ferricyanide ion (pH= 7) redox flow battery that is discussed in chapter 3 as well as DHAQ</p> <p>(pH=14) vs HQDS (pH=0.3) (hydroquinone disulfonic acid) flow battery that is discussed in</p> <p>chapter 4.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/17337/
dc.identifier.articleid 8344
dc.identifier.contextkey 15016723
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/17337
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/31520
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/17337/Torabi_iastate_0097M_18015.pdf|||Fri Jan 14 21:20:50 UTC 2022
dc.subject.disciplines Film and Media Studies
dc.title High voltage quinone flow battery with hybrid acid and base electrolytes
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication 86545861-382c-4c15-8c52-eb8e9afe6b75
thesis.degree.discipline Chemical Engineering
thesis.degree.level thesis
thesis.degree.name Master of Science
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