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Lee, Hyun-Wook
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dc.citation.number 28 -
dc.citation.startPage 1901217 -
dc.citation.title ADVANCED FUNCTIONAL MATERIALS -
dc.citation.volume 29 -
dc.contributor.author Baek, Du San -
dc.contributor.author Jung, Gwan Yeong -
dc.contributor.author Seo, Bora -
dc.contributor.author Kim, Jin Chul -
dc.contributor.author Lee, Hyun-Wook -
dc.contributor.author Shin, Tae Joo -
dc.contributor.author Jeong, Hu Young -
dc.contributor.author Kwak, Sang Kyu -
dc.contributor.author Joo, Sang Hoon -
dc.date.accessioned 2023-12-21T19:06:26Z -
dc.date.available 2023-12-21T19:06:26Z -
dc.date.created 2019-06-10 -
dc.date.issued 2019-07 -
dc.description.abstract The sluggish reaction kinetics of the alkaline hydrogen evolution reaction (HER) remains an important challenge for water–alkali electrolyzers, which originates predominantly from the additional water dissociation step required for the alkaline HER. In this work, it is demonstrated theoretically and experimentally that metastable, face-centered-cubic α-MoC 1− x phase shows superior water dissociation capability and alkaline HER activity than stable, hexagonal-close-packed Mo 2 C phase. Next, high surface area ordered mesoporous α-MoC 1− x (MMC) is designed via a nanocasting method. In MMC structure, the α-MoC 1− x phase facilitates the water dissociation reaction, while the mesoporous structure with high surface area enables a high dispersion of metal NPs and efficient mass transport. As a result, Pt nanoparticles (NPs) supported on MMC (Pt/MMC) show substantially enhanced alkaline HER activity in terms of overpotentials, Tafel slopes, mass and specific activities, and exchange current densities, compared to commercial Pt/C and Pt NPs supported on particulate α-MoC 1− x or β-Mo 2 C. Notably, Pt/MMC shows very low Tafel slope of 30 mV dec –1 , which is the lowest value among the reported Pt-based alkaline HER catalysts, suggesting the critical role of MMC in enhancing the HER kinetics. The promotional effect of MMC support in the alkaline HER is further demonstrated with an Ir/MMC catalyst. -
dc.identifier.bibliographicCitation ADVANCED FUNCTIONAL MATERIALS, v.29, no.28, pp.1901217 -
dc.identifier.doi 10.1002/adfm.201901217 -
dc.identifier.issn 1616-301X -
dc.identifier.scopusid 2-s2.0-85065714581 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/27019 -
dc.identifier.url https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201901217 -
dc.identifier.wosid 000478851700015 -
dc.language 영어 -
dc.publisher Wiley-VCH Verlag -
dc.title Ordered Mesoporous Metastable α-MoC 1− x with Enhanced Water Dissociation Capability for Boosting Alkaline Hydrogen Evolution Activity -
dc.type Article -
dc.description.isOpenAccess FALSE -
dc.relation.journalWebOfScienceCategory Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter -
dc.relation.journalResearchArea Chemistry; Science & Technology - Other Topics; Materials Science; Physics -
dc.type.docType Article -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.subject.keywordAuthor alkaline electrolyzers -
dc.subject.keywordAuthor hydrogen evolution reaction -
dc.subject.keywordAuthor mesoporous materials -
dc.subject.keywordAuthor molybdenum carbide -
dc.subject.keywordAuthor water dissociation -
dc.subject.keywordPlus Carbides -
dc.subject.keywordPlus Catalysts -
dc.subject.keywordPlus Dissociation -
dc.subject.keywordPlus Electrolytic cells -
dc.subject.keywordPlus Hydrogen -
dc.subject.keywordPlus Molybdenum compounds -
dc.subject.keywordPlus Platinum -
dc.subject.keywordPlus Reaction kinetics -
dc.subject.keywordPlus Electrolyzers -
dc.subject.keywordPlus Exchange current densities -
dc.subject.keywordPlus Face-centered cubic -
dc.subject.keywordPlus Hexagonal close packed -
dc.subject.keywordPlus Hydrogen evolution reactions -
dc.subject.keywordPlus Mesoporous structures -
dc.subject.keywordPlus Molybdenum carbide -
dc.subject.keywordPlus Water dissociation -
dc.subject.keywordPlus Mesoporous materials -

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