Atomically dispersed Pt–N4 sites as efficient and selective electrocatalysts for the chlorine evolution reaction

Taejung Lim, Gwan Yeong Jung, Jae Hyung Kim, Sung O Park, Jaehyun Park, Yong-Tae Kim, Seok Ju Kang, Hu Young Jeong, Sang Kyu Kwak () and Sang Hoon Joo ()
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Taejung Lim: Ulsan National Institute of Science and Technology (UNIST)
Gwan Yeong Jung: Ulsan National Institute of Science and Technology (UNIST)
Jae Hyung Kim: Ulsan National Institute of Science and Technology (UNIST)
Sung O Park: Ulsan National Institute of Science and Technology (UNIST)
Jaehyun Park: Ulsan National Institute of Science and Technology (UNIST)
Yong-Tae Kim: Pohang University of Science and Technology (POSTECH)
Seok Ju Kang: Ulsan National Institute of Science and Technology (UNIST)
Hu Young Jeong: Ulsan National Institute of Science and Technology (UNIST)
Sang Kyu Kwak: Ulsan National Institute of Science and Technology (UNIST)
Sang Hoon Joo: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: 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−N4 sites doped on a carbon nanotube (Pt1/CNT) can catalyse the CER with excellent activity and selectivity. The Pt1/CNT catalyst shows superior CER activity to a Pt nanoparticle-based catalyst and a commercial Ru/Ir-based MMO catalyst. Notably, Pt1/CNT exhibits near 100% CER selectivity even in acidic media, with low Cl− concentrations (0.1 M), 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−N4 sites during the CER. Density functional theory calculations suggest the PtN4C12 site as the most plausible active site structure for the CER.

Date: 2020
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DOI: 10.1038/s41467-019-14272-1

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