DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lee, Jae-ik | ko |
dc.contributor.author | Faheem, Abdullah Bin | ko |
dc.contributor.author | Jang, Won Joon | ko |
dc.contributor.author | Kim, Kyung Mi | ko |
dc.contributor.author | Cha, Jin Seong | ko |
dc.contributor.author | Seo, Noh-Uk | ko |
dc.contributor.author | Kim, Hansung | ko |
dc.contributor.author | Lee, Kyung-Koo | ko |
dc.contributor.author | Yang, Jung Hoon | ko |
dc.date.accessioned | 2023-12-06T02:00:43Z | - |
dc.date.available | 2023-12-06T02:00:43Z | - |
dc.date.created | 2023-12-06 | - |
dc.date.issued | 2023-10 | - |
dc.identifier.citation | ACS APPLIED MATERIALS & INTERFACES, v.15, no.41, pp.48122 - 48134 | - |
dc.identifier.issn | 1944-8244 | - |
dc.identifier.uri | http://hdl.handle.net/10203/315789 | - |
dc.description.abstract | Based on the ambipolar characteristics and high solubility of ZnI2, zinc-polyiodide flow batteries (ZIFB) have attracted attention as high-energy density flow batteries. However, due to the various oxidation products of iodide (I-) and the formation of iodine (I-2) solid precipitates at the positive electrode, the limiting state-of-charge (SoC) of ZIFB has not been clearly defined. Herein, a clear definition of SoC in ZIFBs is given based on the thermodynamic relationship among I-(aq)(-), I-3((aq))-, I-5((aq))-, and I-2(aq) in the electrolyte. Conventional ZIFBs are limited by their maximum attainable SoC of 87%, at which the fully charged catholyte includes I-, I-3(-), and I-5(-) ions at molar ratios of 49.6, 32.2, and 18.1%, respectively. Furthermore, two effective strategies to extend the maximum SoC are suggested: (1) increasing the formation constant (K-eq) of I-3(-) can raise the availability of I- for electrooxidation by suppressing I-2 precipitation, and (2) promoting the production of higher-order polyiodides such as I-5(-) can increase the oxidation state of the charged electrolyte. The addition of 5 vol % triethylene glycol (tri-EG) to the electrolyte increased K-eq from 710 to 1123 L mol(-1); this increase was confirmed spectrophotometrically. Tri-EG stabilized I-5(-) ions in the form of the I-5(-)/tri-EG complex, thereby converting the main oxidation product from I-3(-) to I-5(-). The preferred electrochemical production of I-5(-) in the tri-EG electrolyte was observed by electrochemical and computational analyses. As a result, the maximum attainable SoC was enhanced remarkably to 116%, yielding molar ratios of I-, I-3(-), and I-5(-) ions of 9.1, 11.2, and 79.7%, respectively. This SoC extension effect was confirmed in the ZIFB flow cell with stable charge-discharge cycling at the SoC 120% limit, demonstrating the highest energy density, 249.9 Wh L-1, among all reported ZIFBs. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Effective Enhancement of Energy Density of Zinc-Polyiodide Flow Batteries by Organic/Penta-iodide Complexation | - |
dc.type | Article | - |
dc.identifier.wosid | 001078949600001 | - |
dc.identifier.scopusid | 2-s2.0-85174752074 | - |
dc.type.rims | ART | - |
dc.citation.volume | 15 | - |
dc.citation.issue | 41 | - |
dc.citation.beginningpage | 48122 | - |
dc.citation.endingpage | 48134 | - |
dc.citation.publicationname | ACS APPLIED MATERIALS & INTERFACES | - |
dc.identifier.doi | 10.1021/acsami.3c09426 | - |
dc.contributor.localauthor | Jang, Won Joon | - |
dc.contributor.nonIdAuthor | Lee, Jae-ik | - |
dc.contributor.nonIdAuthor | Faheem, Abdullah Bin | - |
dc.contributor.nonIdAuthor | Kim, Kyung Mi | - |
dc.contributor.nonIdAuthor | Cha, Jin Seong | - |
dc.contributor.nonIdAuthor | Seo, Noh-Uk | - |
dc.contributor.nonIdAuthor | Kim, Hansung | - |
dc.contributor.nonIdAuthor | Lee, Kyung-Koo | - |
dc.contributor.nonIdAuthor | Yang, Jung Hoon | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | aqueous flow batteries | - |
dc.subject.keywordAuthor | zinc-polyiodide | - |
dc.subject.keywordAuthor | energydensity | - |
dc.subject.keywordAuthor | triethylene glycol | - |
dc.subject.keywordAuthor | penta-iodide | - |
dc.subject.keywordAuthor | iodine film | - |
dc.subject.keywordPlus | RENEWABLE ENERGY | - |
dc.subject.keywordPlus | TRIIODIDE ION | - |
dc.subject.keywordPlus | ELECTROLYTE | - |
dc.subject.keywordPlus | BROMINE | - |
dc.subject.keywordPlus | DESIGN | - |
dc.subject.keywordPlus | PERFORMANCE | - |
dc.subject.keywordPlus | OXIDATION | - |
dc.subject.keywordPlus | AMMONIUM | - |
dc.subject.keywordPlus | FIRE | - |
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