Effects of Doping Methods and Kinetic Relevance of N and O Atomic Co-Functionalization on Carbon Electrode for V(IV)/V(V) Redox Reactions in Vanadium Redox Flow Battery.
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| Title: | Effects of Doping Methods and Kinetic Relevance of N and O Atomic Co-Functionalization on Carbon Electrode for V(IV)/V(V) Redox Reactions in Vanadium Redox Flow Battery. |
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| Authors: | Kim, Jiyeon1, Lim, Hyebin1, Jyoung, Jy-Young2, Lee, Eun-Sook2, Yi, Jung S.3, Lee, Doohwan1 dolee@uos.ac.kr |
| Source: | Electrochimica Acta. Aug2017, Vol. 245, p724-733. 10p. |
| Subjects: | Carbon electrodes, Doping agents (Chemistry), Chemical kinetics, Vanadium catalysts, Oxidation-reduction reaction |
| Abstract: | In this study, electrocatalytic effects of nitrogen (N) and oxygen (O) atomic co-doping on carbon electrode are studied for vanadium redox flow battery (VRFB). The N and O co-functionalized graphite felt (GF) electrodes are prepared by two different synthesis routes: (i) impregnation of urea or melamine on the pristine-GF followed by reactions at high temperatures (batch process), and (ii) chemical vapor deposition of the pristine-GF by ammoxidation reactions with NH 3 -O 2 reactants (continuous process). The properties of the electrodes are characterized, and the effects of doping methods and the kinetic relevance of the N and O co-functionalization are investigated for the VO 2+ /VO 2 + redox reactions. The ammoxidative surface reaction of the GF with NH 3 -O 2 was highly effective for N and O co-doping with a significant formation of pyrrolic-N, pyridinic-N, quaternary-N, hydroxyl, and carbonyl functional groups with negligible degradation of the GF structure. The collective correlation analysis reveals that pyrrolic-N and hydroxyl are the most kinetically relevant molecular configurations of the N and O functional groups for facilitating VO 2+ /VO 2 + redox kinetics. The N and O co-functionalized GF when utilized both for the cathode and anode electrodes for a VRFB afforded 3−4% greater initial voltage and energy efficiencies along with 1.6 times higher initial charge–discharge capacity than the conventional oxygen-doped GF electrode owing to the substantially lower reaction overpotential. The results elucidate the marked effects of N and O co-functionalization on the electrocatalytic activities of carbon electrodes for vanadium redox kinetics in VRFB. [ABSTRACT FROM AUTHOR] |
| Copyright of Electrochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 124440310 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Effects of Doping Methods and Kinetic Relevance of N and O Atomic Co-Functionalization on Carbon Electrode for V(IV)/V(V) Redox Reactions in Vanadium Redox Flow Battery. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kim%2C+Jiyeon%22">Kim, Jiyeon</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lim%2C+Hyebin%22">Lim, Hyebin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Jyoung%2C+Jy-Young%22">Jyoung, Jy-Young</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lee%2C+Eun-Sook%22">Lee, Eun-Sook</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Yi%2C+Jung+S%2E%22">Yi, Jung S.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Lee%2C+Doohwan%22">Lee, Doohwan</searchLink><relatesTo>1</relatesTo><i> dolee@uos.ac.kr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Electrochimica+Acta%22">Electrochimica Acta</searchLink>. Aug2017, Vol. 245, p724-733. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Carbon+electrodes%22">Carbon electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Doping+agents+%28Chemistry%29%22">Doping agents (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Vanadium+catalysts%22">Vanadium catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation-reduction+reaction%22">Oxidation-reduction reaction</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In this study, electrocatalytic effects of nitrogen (N) and oxygen (O) atomic co-doping on carbon electrode are studied for vanadium redox flow battery (VRFB). The N and O co-functionalized graphite felt (GF) electrodes are prepared by two different synthesis routes: (i) impregnation of urea or melamine on the pristine-GF followed by reactions at high temperatures (batch process), and (ii) chemical vapor deposition of the pristine-GF by ammoxidation reactions with NH 3 -O 2 reactants (continuous process). The properties of the electrodes are characterized, and the effects of doping methods and the kinetic relevance of the N and O co-functionalization are investigated for the VO 2+ /VO 2 + redox reactions. The ammoxidative surface reaction of the GF with NH 3 -O 2 was highly effective for N and O co-doping with a significant formation of pyrrolic-N, pyridinic-N, quaternary-N, hydroxyl, and carbonyl functional groups with negligible degradation of the GF structure. The collective correlation analysis reveals that pyrrolic-N and hydroxyl are the most kinetically relevant molecular configurations of the N and O functional groups for facilitating VO 2+ /VO 2 + redox kinetics. The N and O co-functionalized GF when utilized both for the cathode and anode electrodes for a VRFB afforded 3−4% greater initial voltage and energy efficiencies along with 1.6 times higher initial charge–discharge capacity than the conventional oxygen-doped GF electrode owing to the substantially lower reaction overpotential. The results elucidate the marked effects of N and O co-functionalization on the electrocatalytic activities of carbon electrodes for vanadium redox kinetics in VRFB. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Electrochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.electacta.2017.06.008 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 724 Subjects: – SubjectFull: Carbon electrodes Type: general – SubjectFull: Doping agents (Chemistry) Type: general – SubjectFull: Chemical kinetics Type: general – SubjectFull: Vanadium catalysts Type: general – SubjectFull: Oxidation-reduction reaction Type: general Titles: – TitleFull: Effects of Doping Methods and Kinetic Relevance of N and O Atomic Co-Functionalization on Carbon Electrode for V(IV)/V(V) Redox Reactions in Vanadium Redox Flow Battery. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kim, Jiyeon – PersonEntity: Name: NameFull: Lim, Hyebin – PersonEntity: Name: NameFull: Jyoung, Jy-Young – PersonEntity: Name: NameFull: Lee, Eun-Sook – PersonEntity: Name: NameFull: Yi, Jung S. – PersonEntity: Name: NameFull: Lee, Doohwan IsPartOfRelationships: – BibEntity: Dates: – D: 10 M: 08 Text: Aug2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 00134686 Numbering: – Type: volume Value: 245 Titles: – TitleFull: Electrochimica Acta Type: main |
| ResultId | 1 |
