Unraveling V(V)-V(IV)-V(III)-V(II) Redox Electrochemistry in Highly Concentrated Mixed Acidic Media for a Vanadium Redox Flow Battery: Origin of the Parasitic Hydrogen Evolution Reaction
DC Field | Value | Language |
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dc.contributor.author | Lee, Jihye | - |
dc.contributor.author | Muya, Jules Tshishimbi | - |
dc.contributor.author | Chung, Hoeil | - |
dc.contributor.author | Chang, Jinho | - |
dc.date.accessioned | 2022-07-09T03:35:52Z | - |
dc.date.available | 2022-07-09T03:35:52Z | - |
dc.date.created | 2021-05-11 | - |
dc.date.issued | 2019-11 | - |
dc.identifier.issn | 1944-8244 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/146909 | - |
dc.description.abstract | We present a mechanistic understanding of the full redox electrochemistry of V(V)-V(IV)-V(III)-V(II) and the origin of the parasitic hydrogen evolution reaction (HER) during electroreduction of either V3+ or VO2+ in a highly concentrated mixed acidic solution based on both electroanalytical and computational approaches. First, we found that the VO2+/VO2+ redox reaction is well explained by the EC/EC square scheme. We also found that V3+ is electrochemically oxidized to V4+ and subsequently undergoes a transition to stable VO2+ via hydrolysis. In the V3+/V2+ redox reaction via voltammetric analysis at scan rates greater than 0.05 V/s, the voltammograms are well explained based on a simple 1e(-) transfer reaction scheme. However, at the longer time scale observed in the chronoamperograms with constantly applied potentials where V3+ is electrochemically reduced to V2+, we found that a significant HER occurs because of possible formation of an electrocatalyst related to the V(II)O species, V(II)(catalyst). We suggest that V(II)O is kinetically formed from V2+ via hydrolysis only when a local concentration of V2+ is high in the vicinity of a GC electrode surface, and V(II)O is adsorbed on a GC surface to form V(II)(catalyst). To extend our mechanistic pathway, electroreduction of VO2+ to V(II) was also analyzed, revealing that VO2+ is electroreduced to VO+ and further reduced to VO in addition to disproportionation of VO+. Eventually, V(II)(catalyst) forms on a GC electrode, resulting in a significant HER. The computational calculation strongly supports the possible formation of V(II)(catalyst). The calculation shows that neither V3+ nor V2+ can form stable intermediates during the HER, while V(II)O has the highest proton affinity compared with V(III)(O+) and V(IV)O2+, indicating a plausible electrocatalytic property of V(II)O for the HER. | - |
dc.language | 영어 | - |
dc.language.iso | en | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Unraveling V(V)-V(IV)-V(III)-V(II) Redox Electrochemistry in Highly Concentrated Mixed Acidic Media for a Vanadium Redox Flow Battery: Origin of the Parasitic Hydrogen Evolution Reaction | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Chung, Hoeil | - |
dc.contributor.affiliatedAuthor | Chang, Jinho | - |
dc.identifier.doi | 10.1021/acsami.9b12676 | - |
dc.identifier.scopusid | 2-s2.0-85074765306 | - |
dc.identifier.wosid | 000497263600024 | - |
dc.identifier.bibliographicCitation | ACS APPLIED MATERIALS & INTERFACES, v.11, no.45, pp.42066 - 42077 | - |
dc.relation.isPartOf | ACS APPLIED MATERIALS & INTERFACES | - |
dc.citation.title | ACS APPLIED MATERIALS & INTERFACES | - |
dc.citation.volume | 11 | - |
dc.citation.number | 45 | - |
dc.citation.startPage | 42066 | - |
dc.citation.endPage | 42077 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | N | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Science & Technology - Other Topics | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalWebOfScienceCategory | Nanoscience & Nanotechnology | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.subject.keywordPlus | GRAPHITE ELECTRODE MATERIALS | - |
dc.subject.keywordPlus | WATER-OXIDATION | - |
dc.subject.keywordPlus | IONIC LIQUID | - |
dc.subject.keywordPlus | CARBON FELT | - |
dc.subject.keywordPlus | PERFORMANCE | - |
dc.subject.keywordPlus | PROGRESS | - |
dc.subject.keywordPlus | DENSITY | - |
dc.subject.keywordPlus | CELL | - |
dc.subject.keywordPlus | VOLTAMMETRY | - |
dc.subject.keywordPlus | MECHANISM | - |
dc.subject.keywordAuthor | all vanadium redox mechanism | - |
dc.subject.keywordAuthor | hydrogen evolution reaction | - |
dc.subject.keywordAuthor | vanadium(II) oxide | - |
dc.subject.keywordAuthor | electrocatalyst | - |
dc.subject.keywordAuthor | vanadium redox flow battery | - |
dc.identifier.url | https://pubs.acs.org/doi/10.1021/acsami.9b12676 | - |
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