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| Type |
Poster Presentation |
| Area |
재료화학 |
| Room No. |
포스터발표장 |
| Time |
4월 21일 (금요일) 13:00~14:30 |
| Code |
MAT.P-369 |
| Subject |
Metal-Support Interaction between Platinum and Mesoporous Molybdenum Carbide for Efficient Alkaline Hydrogen Evolution Reaction
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| Authors |
백두산, 서보라1, 주상훈2,*
UNIST 화학공학과, Korea
1UNIST 화학과, Korea
2UNIST 에너지화학공학부, Korea
|
| Abstract |
More sluggish reaction kinetics and inferior stability of Pt catalysts for alkaline hydrogen evolution reaction (HER) compared to acidic HER represent a great challenge in alkaline electrolyzer technologies, which is an essential element in sustainable hydrogen economy. In this presentation, we have synthesized mesostructured molybdenum carbide supported Pt (Pt/MMC) catalyst for alkaline HER, and demonstrate that the alkaline HER activity of Pt nanoparticle catalyst can be promoted by exploiting metal−support interaction between Pt nanoparticles and molybdenum carbide support. X-ray absorption near edge structure and X-ray photoelectron spectroscopy analyses revealed that Pt atoms exist in more reduced oxidation states in Pt/MMC than those in commercial Pt/C catalysts (Pt nanoparticles dispersed on carbon black). Compared to carbon black support, MMC could donate more electrons to nearby Pt atoms, elevating d-band center of Pt. Electrochemical measurements demonstrated that mass activity and specific activity of the Pt/MMC are 1.6- and 1.5-fold higher than those of commercial Pt/C with the same Pt loading, respectively. This result suggested that the adsorption/desorption strength of reactants (i.e. hydrogen) and reaction intermediates (i.e. hydroxide) was adjusted to the optimized level for efficient HER in alkaline media. |
| E-mail |
dsbaek@unist.ac.kr |
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119th General Meeting of the KCS