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Investigation of ionic liquids for electrochemical applications.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Investigation of ionic liquids for electrochemical applications./
Author:	Sun, Liyuan.
Description:	1 online resource (242 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.
Contained By:	Dissertation Abstracts International78-07B(E).
Subject:	Chemical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781369541809

Investigation of ionic liquids for electrochemical applications.
Sun, Liyuan.

Investigation of ionic liquids for electrochemical applications. - 1 online resource (242 pages)

Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

This item is not available from ProQuest Dissertations & Theses.

Ionic Liquids (ILs) are organic compounds composed merely of ions and with melting points generally below 100°C. Many ILs have melting points around room temperature and are known as room temperature ionic liquids (RTILs). RTILs have attracted great interest for practical applications over the past few decades due to their unique properties such as negligible vapor pressure, low flammability, high thermal, chemical and electrochemical stability and good solvating properties. Additionally, physicochemical properties of an IL can be easily tuned by changing the structure of the cation and anion. Since ILs are comprised entirely of ions, their intrinsic ionic conductivity and wide electrochemical windows make them attractive electrolyte candidates for electrochemical devices. Ionic liquids have been studied for electrochemical applications in this work from the following three aspects: (1) electrocatalyst for electrochemical reduction of CO2, (2) solvents for electroplating of chromium from trivalent chromium sources and (3) electrolytes for renewable energy storage devices such as lithium-ion batteries.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369541809Subjects--Topical Terms:

555952
Chemical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Investigation of ionic liquids for electrochemical applications.
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100 1 $a Sun, Liyuan. $3 1182245
245 1 0 $a Investigation of ionic liquids for electrochemical applications.
264 0 $c 2016
300 $a 1 online resource (242 pages)
336 $a text $b txt $2 rdacontent
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500 $a Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.
500 $a Adviser: Joan F. Brennecke.
502 $a Thesis (Ph.D.) $c University of Notre Dame $d 2016.
504 $a Includes bibliographical references
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a Ionic Liquids (ILs) are organic compounds composed merely of ions and with melting points generally below 100°C. Many ILs have melting points around room temperature and are known as room temperature ionic liquids (RTILs). RTILs have attracted great interest for practical applications over the past few decades due to their unique properties such as negligible vapor pressure, low flammability, high thermal, chemical and electrochemical stability and good solvating properties. Additionally, physicochemical properties of an IL can be easily tuned by changing the structure of the cation and anion. Since ILs are comprised entirely of ions, their intrinsic ionic conductivity and wide electrochemical windows make them attractive electrolyte candidates for electrochemical devices. Ionic liquids have been studied for electrochemical applications in this work from the following three aspects: (1) electrocatalyst for electrochemical reduction of CO2, (2) solvents for electroplating of chromium from trivalent chromium sources and (3) electrolytes for renewable energy storage devices such as lithium-ion batteries.
520 $a It has been recently reported that imidazolium based ILs can effectively reduce the overpotential for electrochemical reduction of CO2, most likely through complexation. This work investigates the role of the ionic liquid [emim][Tf2N] plays in electrochemical reduction of CO 2. It was found that [emim][Tf2N], when used as a supporting electrolyte and electrocatalyst, was not only able to decrease the reduction overpotential for CO2 reduction by as much as 0.18 V compared with the conventional supporting electrolyte tetraethylammonium perchlorate (TEAP), but can alter the reaction pathway by promoting the formation of carbon monoxide along with the production of a carboxylate specie instead of oxalate anion. The results highlight the ability of [emim][Tf2N] to modulate the CO2 reduction products.
520 $a Chromium electroplating from aqueous baths containing hexavalent chromium (Cr(VI)) salts is a widely adopted industrial technology that produces chromium coatings for wear resistance, corrosion resistance and improved aesthetics. However, severe environmental concerns lie in this technology due to the high toxicity of Cr(VI). ILs containing trivalent chromium (Cr(III)) salts are potential solutions to the existing problems for chromium electroplating. A series of imidazolium chloride ionic liquids with varied cationic alkyl chain lengths were used for electroplating of chromium with chromium chloride hexahydrate (CrCl3&dot;6H2O) as the chromium source in this study. Chromium coatings with comparable properties compared with the conventional commercial chromium coatings were obtained, revealing a potential of using this type of mixtures as a more environmentally friendly alternative to the conventional practice to produce chromium coatings.
520 $a A series of RTILs based on 1-ethyl-3-methylimidazolium ([emim] +) and tetra-alkylphosphonium ([P222n]+) cations with different aprotic heterocyclic anions (AHAs) were synthesized and characterized as potential electrolyte candidates for lithium-ion battery applications. The results showed that many of the AHA RTILs exhibit very good conductivity for their viscosities as identified by the exceptionally high molar conductivity ratio. The effect of addition of lithium AHA salts on the transport properties of the lithium salt/IL mixtures was further explored with a particular focus on imidazolium cations paired with three different pyrazolide based anions. Consistent with previous studies, it was found that lithium ions, although with a smaller size, diffuse slower than the cation and anion of the IL, which is a strong indicator of the existence of complexes formed by lithium and anions. Significant increase in viscosity and decrease in ionic conductivity with addition of lithium salts were observed for the three AHA RTIL based mixtures, as for other lithium containing RTILs reported elsewhere. This reinforces the necessity to search for approaches to alleviate such effects caused by addition of lithium salts in order to make the lithium salt/IL mixtures practically suitable as electrolytes for lithium-ion battery applications.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Chemical engineering. $3 555952
650 4 $a Materials science. $3 557839
650 4 $a Energy. $3 784773
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690 $a 0794
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710 2 $a University of Notre Dame. $b Chemical and Biomolecular Engineering. $3 1182246
773 0 $t Dissertation Abstracts International $g 78-07B(E).
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