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Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
Research Interests
  • Molecular modeling and simulation, statistical thermodynamics, molecular physics

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Atomically dispersed Pt-N-4 sites as efficient and selective electrocatalysts for the chlorine evolution reaction

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Title
Atomically dispersed Pt-N-4 sites as efficient and selective electrocatalysts for the chlorine evolution reaction
Author
Lim, TaejungJung, Gwan YeongKim, Jae HyungPark, Sung O.Park, JaehyunKim, Yong-TaeKang, Seok JuJeong, Hu YoungKwak, Sang KyuJoo, Sang Hoon
Issue Date
2020-01
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.11, no.1
Abstract
Chlorine evolution reaction (CER) is a critical anode reaction in chlor-alkali electrolysis. Although precious metal-based mixed metal oxides (MMOs) have been widely used as CER catalysts, they suffer from the concomitant generation of oxygen during the CER. Herein, we demonstrate that atomically dispersed Pt-N-4 sites doped on a carbon nanotube (Pt-1/CNT) can catalyse the CER with excellent activity and selectivity. The Pt-1/CNT catalyst shows superior CER activity to a Pt nanoparticle-based catalyst and a commercial Ru/Ir-based MMO catalyst. Notably, Pt-1/CNT exhibits near 100% CER selectivity even in acidic media, with low Cl- concentrations (0.1M), as well as in neutral media, whereas the MMO catalyst shows substantially lower CER selectivity. In situ electrochemical X-ray absorption spectroscopy reveals the direct adsorption of Cl- on Pt-N-4 sites during the CER. Density functional theory calculations suggest the PtN4C12 site as the most plausible active site structure for the CER.
URI
https://scholarworks.unist.ac.kr/handle/201301/31674
URL
https://www.nature.com/articles/s41467-019-14272-1
DOI
10.1038/s41467-019-14272-1
ISSN
2041-1723
Appears in Collections:
PHY_Journal Papers
ECHE_Journal Papers
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