{"646377":{"#nid":"646377","#data":{"type":"event","title":"PhD Proposal by Julia Allen","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETHE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EGEORGIA INSTITUTE OF TECHNOLOGY\u003C\/strong\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EUnder the provisions of the regulations for the degree\u003Cbr \/\u003E\r\n\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDOCTOR OF PHILOSOPHY\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Eon Monday, April 26, 2021\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E11:00 AM\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Evia\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EBlueJeans Video Conferencing\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Ca href=\u0022https:\/\/bluejeans.com\/960435511\u0022\u003Ehttps:\/\/bluejeans.com\/960435511\u003C\/a\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Ewill be held the\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDISSERTATION\u0026nbsp;PROPOSAL\u0026nbsp;DEFENSE\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\n\u003Cstrong\u003Efor\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EJulia Allen\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u0026nbsp;\u0026ldquo;Understanding Electrode-Electrolyte Interactions for Increased Energy Density in Supercapacitors for Aerospace Applications\u0026rdquo;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee Members:\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. W. Jud Ready, Advisor, GTRI\/MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Matthew McDowell, ME\/MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Rampi Ramprasad, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Paul Kohl, ChBE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EEric Fox, Ph.D., NASA-MSFC\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EMr. Curtis Hill, NASA-MSFC\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; \u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ECurrent and future energy storage applications require devices with high energy density, high power density, and long cycle lives. Supercapacitors are a form of energy storage that currently have moderate energy density and power density and long cycle lives. The two main types of supercapacitors are electrochemical double layer capacitors, which use non-faradiac charge storage mechanisms, and pseudocapacitors, which use faradiac charge storage mechanisms. Hybrid supercapacitors combine these two charge storage mechanisms. For this project, samples of various pseudocapacitive coatings deposited on carbon nanotubes (CNT) using atomic layer deposition will be investigated. Coated CNTs make a promising electrode material because they benefit from the high surface area and stability of the carbon nanotubes and the pseudocapacitance of the coating material. The overall objective is to understand the interactions between ionic liquid electrolytes and the coatings resulting in higher energy densities. First, samples will be cycled \u003Cem\u003Eex situ\u003C\/em\u003E and then observed with the transmission electron microscope (TEM). This will be compared to samples cycled with the same ionic liquids \u003Cem\u003Ein situ\u003C\/em\u003E with the same scan rate and voltage range. The variables considered will be coating type, ionic liquid type, coating thickness, and pore size.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThis project focuses on the interactions between two pseudocapacitive materials and two ionic liquids.\u0026nbsp;\u0026nbsp; Both TiO\u003Csub\u003E2\u003C\/sub\u003E and MnO\u003Csub\u003E2 \u003C\/sub\u003Ehave been investigated for use in supercapacitors and have demonstrated pseudocapacitance.\u0026nbsp; In addition, thin coatings of Al\u003Csub\u003E2\u003C\/sub\u003EO\u003Csub\u003E3\u003C\/sub\u003E has been shown to reduce electrode degradation and increase interactions between the electrode material and electrolyte.\u0026nbsp; To examine this, the proposed research will include samples both with and without Al\u003Csub\u003E2\u003C\/sub\u003EO\u003Csub\u003E3\u003C\/sub\u003E layers.\u0026nbsp; One of the ionic liquids used in this experiment is 10 wt% lithium bis(trifluoromethylsulfonyl)imide (TFSI) in 1-butyl-1-methylpyrrolidiniumbis(trifluoromethylsulfonyl)imide (P14TFSI), which is known to work for\u003Cem\u003E in situ\u003C\/em\u003E TEM experiments.\u0026nbsp; The second ionic liquid that will be included in the experiment will be determined using materials informatics. In this part of the project, a machine learning algorithm is used to predict the conductivity of ionic liquids. Using these predictions, a high conductivity ionic liquid will be selected.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EPreliminary data shows that supercapacitors with bare CNT electrodes can store 3.39 \u0026plusmn; 0.88 mF. Based on literature values, the TiO\u003Csub\u003E2\u003C\/sub\u003E-coated samples should have 3 to 4 times the capacitance, and the MnO\u003Csub\u003E2\u003C\/sub\u003E samples should have a higher capacitance than that. The samples with additional Al\u003Csub\u003E2\u003C\/sub\u003EO\u003Csub\u003E3\u003C\/sub\u003E coatings are expected to have about the same capacitance as the respective electrodes without the Al\u003Csub\u003E2\u003C\/sub\u003EO\u003Csub\u003E3\u003C\/sub\u003E coatings but have a much lower ESR and higher power density.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThis work will be a significant contribution to the understanding of pseudocapacitive energy storage mechanisms in supercapacitors.\u0026nbsp;\u0026nbsp; Improving this understanding is a crucial step in the development of supercapacitors as high energy density, high power density energy storage devices. In addition, this work investigates the use of TiO\u003Csub\u003E2\u003C\/sub\u003E and MnO\u003Csub\u003E2\u003C\/sub\u003E, which are promising alternatives to RuO\u003Csub\u003E2\u003C\/sub\u003E.\u0026nbsp; Demonstrating high performance with these materials will expand their use in future research. The development of a machine learning model for predicting ionic liquid conductivity is also a significant contribution to the field. In the future, it may even be possible to expand the model to predict additional properties. However, this project focused on predicting conductivity since it is challenging to find consistent conductivity information for ionic liquids.\u0026nbsp; This work should make it less costly to experiment with a wider range of ionic liquids in supercapacitors since low conductivity ionic liquids can be eliminated using the model. Finally, this research will demonstrate that \u003Cem\u003Ein situ\u003C\/em\u003E TEM can be used to observe supercapacitor electrode materials throughout charging and discharging.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Understanding Electrode-Electrolyte Interactions for Increased Energy Density in Supercapacitors for Aerospace Applications"}],"uid":"27707","created_gmt":"2021-04-12 15:56:31","changed_gmt":"2021-04-12 15:56:31","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2021-04-26T12:00:00-04:00","event_time_end":"2021-04-26T15:00:00-04:00","event_time_end_last":"2021-04-26T15:00:00-04:00","gmt_time_start":"2021-04-26 16:00:00","gmt_time_end":"2021-04-26 19:00:00","gmt_time_end_last":"2021-04-26 19:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"102851","name":"Phd proposal"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}