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| Type |
Oral Presentation |
| Area |
Oral Presentation of Young Scholars in Electrochemistry |
| Room No. |
Room 407+408 |
| Time |
THU 10:20-10:30 |
| Code |
ELEC.O-9 |
| Subject |
Electrochemistry of Rationally Designed Metal Nanoclusters in Atomic Precision. |
| Authors |
Kyuju Kwak, Dongil Lee*
Department of Chemistry, Yonsei University, Korea
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| Abstract |
For the past few years, atomically precise metal nanoclusters containing a few to a few hundreds of metal atoms have been the focus of recent investigations because of their novel physicochemical properties with high stability. This presentation focus on recent progress made in the electrochemistry of the atomically precise metal nanoclusters and their applications in electrocatalysis. A sizable opening of HOMO-LUMO gap observed for Au25 in voltammograms gradually decreases with increasing nanocluster size, which is in line with the change in the optical gap. In addition to the size effects, the difference in chemical composition is also sensitively detected by voltammetry. The HOMO-LUMO gaps of Pt- and Pd-doped Au25 determined by voltammetry were drastically decreased indicating that their electronic structures were significantly altered upon doping of the foreign metal. Furthermore, heteroatom doping has been a powerful strategy to tune the electronic properties of metal nanoclusters at the atomic level, which offers great potential for achieving high activity in their electrocatalytic applications. The Pt-doped Au25 nanocluster shows the excellent electrocatalytic activity toward hydrogen evolution reaction. This can be ascribed to the positive shift of the reduction potential that matches well with the reduction potential of proton and its thermodynamically neutral binding energy for proton adsorption. Consequently, the atomically controlled metal nanoclusters will enable us to systematically optimize the electrochemical properties suitable for electrocatalysis, thus providing a powerful platform for the discovery of finely tuned nanocatalysts. |
| E-mail |
kkj818@yonsei.ac.kr |
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123rd General Meeting of the KCS