2026-09-21T01:21:16Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/101219 2023-07-11 col_2142_5131 col_2142_13836 com_2142_5130 com_2142_13835 com_2142_234

Braun, Paul Savsatli, Yavuz 2018-09-04T20:36:53Z 2018-09-04T20:36:53Z 2020-09-05T09:15:20Z 2018-04-26 2018-05 The increasing contribution of intermittent renewable energy sources to the electrical grid is resulting in energy storage becoming more and more crucial to both improve grid stability and to enable increasing penetration of renewable in electrical generation. There are numerous number of technologies being considered for that purpose and redox flow batteries are considered one of the most promising designs for stationary energy storage due to their scalability, high-efficiency and decoupled control of energy and power. To prevent the crossover of energy carriers between anolyte and catholyte compartments of the flow battery, as one example, the redox active ethyl viologen agent has been covalently bound within crosslinked polymeric colloids. Little is currently known about how electrons (energy) transfers either within or between redox active colloids (RAC). To elucidate this, contact-mediated electron transfer between these redox active colloids (RAC) was characterized via confocal microscope using the intrinsic redox state-dependent electrofluorochromism of the RACs as the readout of the charge state of individual colloids. Via this approach, it was possible to map the redox-state of the system. By means of coupling a distinct fluorescent contrast with the respective redox state, intra- and inter- colloid energy transfer processes were reversibly imaged in situ, during electrochemical cycling. A three electrode in-situ cell setup was used for the cycling in which a Pt electrode used as the working electrode, carbon was used as the counter electrode and Ag/AgCl was used as the reference electrode. The system also showed a considerably increased sensitivity to fluorescence quenching. Investigation of the amplified sensitivity was done and this was attributed to fast electron hopping among neighboring redox groups. Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-05-01 The student, Yavuz Savsatli, accepted the attached license on 2018-04-25 at 15:39. The student, Yavuz Savsatli, submitted this Thesis for approval on 2018-04-25 at 15:45. This Thesis was approved for publication on 2018-04-26 at 13:49. DSpace SAF Submission Ingestion Package generated from Vireo submission #12446 on 2018-08-31 at 17:21:23 Made available in DSpace on 2018-09-04T20:36:53Z (GMT). No. of bitstreams: 3 SAVSATLI-THESIS-2018.pdf: 1948904 bytes, checksum: 27725d11012705371731a01c0f530c32 (MD5) Yavuz Savsatli - Masters Thesis_04.25.18.docx: 5304734 bytes, checksum: 27ac7c402a829e08450bfc9eca96ed72 (MD5) LICENSE.txt: 4211 bytes, checksum: cc6759abb3d66ead50b763c21c90b7ff (MD5) Previous issue date: 2018-04-26 Embargo set by: Seth Robbins for item 107303 Lift date: 2020-09-04T20:37:00Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 107303 Lift date: 2020-09-04T20:42:08Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system U of I Only Restriction Lifted for Item 107303 on 2020-09-05T09:15:20Z. application/pdf http://hdl.handle.net/2142/101219 en Copyright 2018 Yavuz Savsatli Redox Active Colloids, Electrochemistry, Energy transfer, Flow Battery Visualization of energy transfer among redox active polymeric colloids via in-situ fluorescence microscopy text text Materials Science & Engineerng Materials Science & Engr University of Illinois at Urbana-Champaign Thesis M.S.