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|
| Type |
Oral Presentation |
| Area |
Oral Presentation of Young Material Chemists |
| Room No. |
Samda Hall A |
| Time |
THU 09:11-: |
| Code |
MAT.O-2 |
| Subject |
Atomically Tailored Metal Nanoclusters: A New Electrocatalysts for Energy Conversion |
| Authors |
Kyuju Kwak, woojun choi, Dongil Lee*
Department of Chemistry, Yonsei University, Korea
|
| Abstract |
For the past few years, owing to their novel electronic, optical and catalytic properties with high chemical and thermodynamic stability, metal nanoclusters containing a few to a few hundreds of metal atoms have been extensively studied. They appear to represent the bulk-to-molecule transition region where electronic band energetics yield to quantum confinement effects and discrete electronic states emerge. This presentation will provide the fundamental science and technological applications of these metal nanoclusters. Voltammetry of the metal nanoclusters displays unique redox peaks and size-dependent electrochemical HOMO-LUMO gaps that can be related to optical and calculated energy gaps. The Au25, Au38 and Au67 nanoclusters exhibited the increase in the energy gap opening at the Fermi level with increasing size, revealing the molecule-like optical and electrochemical properties. This result suggests the groundwork that can advance our understanding of the nature and transitions of metal-to-molecule in nanoclusters. In addition, mono Pt-doped Au25 nanocluster, PtAu24, show the excellent electrocatalytic activity toward hydrogen evolution reaction, which exhibits remarkable activity with the rate constant of 121,000 s-1 at -0.7 V (vs. RHE) and very low onset-potential of Eonset= 70 mV (vs. RHE). The origin of the extraordinary catalytic activity of the nanoclusters is discussed along with reaction mechanisms. The doped metal nanoclusters opened an avenue to atomically tune their electronic properties and redox potentials for the development of tailored electrocatalysts. |
| E-mail |
kkj818@yonsei.ac.kr |
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121st General Meeting of the KCS