dc.citation.conferencePlace |
KO |
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dc.citation.conferencePlace |
제주 |
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dc.citation.title |
2015 Korean Institute of Chemical Engineers Spring Meeting |
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dc.contributor.author |
사영진 |
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dc.contributor.author |
Joo, Sang Hoon |
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dc.date.accessioned |
2023-12-19T22:37:51Z |
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dc.date.available |
2023-12-19T22:37:51Z |
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dc.date.created |
2015-11-25 |
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dc.date.issued |
2015-04-22 |
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dc.description.abstract |
Ordered mesoporous manganese oxides with different crystal structures and oxidation states (Meso-MnO2, Mn2O3, Mn3O4, and MnO) were prepared by nanocasting KIT-6 mesoporous silica. Oxygen electrocatalytic activity of the Meso-MnOx was investigated in 0.1 M KOH. Meso-MnO2 and Mn2O3 showed higher oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities than meso-Mn3O4 and MnO. Contrary to the previous report that revealed low ORR and OER activities for β-MnO2, relatively higher oxygen electrocatalytic activity was observed with Meso-MnO2, which can be attributed to its slightly lower oxidation state below 4 (~3.9), and unique disordered (or mixed) crystal phase. Comparing the Meso-MnO and Mn3O4, the former showed better ORR activity than the latter, demonstrating the advantage of the mixed phase in Meso-MnO for facilitating oxygen electrocatalytic activity. In-situ XAS showed noticeable potential-dependent change in oxidation state for Meso-MnOx catalysts, suggesting the oxygen electrocatalytic reactions invoke in situ phase transformation of the catalyst surface. |
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dc.identifier.bibliographicCitation |
2015 Korean Institute of Chemical Engineers Spring Meeting |
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dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/43459 |
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dc.identifier.url |
https://www.cheric.org/research/tech/proceedings/view.php?seq=124165&page=6&proceedingssearch=silica |
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dc.language |
영어 |
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dc.publisher |
Korean Institute of Chemical Engineers(KIChE) |
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dc.title |
Oxygen Electrocatalysts Based on Ordered Mesoporous Manganese Oxides with Different Oxidation States and Crystal Phases |
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dc.type |
Conference Paper |
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dc.date.conferenceDate |
2015-04-22 |
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