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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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Ordered Mesoporous Metastable α-MoC 1− x with Enhanced Water Dissociation Capability for Boosting Alkaline Hydrogen Evolution Activity

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Title
Ordered Mesoporous Metastable α-MoC 1− x with Enhanced Water Dissociation Capability for Boosting Alkaline Hydrogen Evolution Activity
Author
Baek, Du SanJung, Gwan YeongSeo, BoraKim, Jin ChulLee, Hyun-WookShin, Tae JooJeong, Hu YoungKwak, Sang KyuJoo, Sang Hoon
Issue Date
2019-07
Publisher
Wiley-VCH Verlag
Citation
ADVANCED FUNCTIONAL MATERIALS, v.29, no.28, pp.1901217
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/27019
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201901217
DOI
10.1002/adfm.201901217
ISSN
1616-301X
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