Highly Selective Active Chlorine Generation Electrocatalyzed by Co3O4 Nanoparticles: Mechanistic Investigation through in Situ Electrokinetic and Spectroscopic Analyses
| Autor: | Hyo Yong Ahn, Hongmin Seo, Heonjin Ha, Yoon Ho Lee, Kang Hee Cho, Kyoungsuk Jin, Kang Gyu Lee, Sunghak Park, Ki Tae Nam |
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| Rok vydání: | 2019 |
| Předmět: |
Reaction mechanism
Hypochlorous acid Inorganic chemistry chemistry.chemical_element 02 engineering and technology Reaction intermediate 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Chloride 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry medicine Chlorine General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Cobalt medicine.drug |
| Zdroj: | The Journal of Physical Chemistry Letters. 10:1226-1233 |
| ISSN: | 1948-7185 |
| Popis: | The reaction mechanism of electrochemical chloride oxidation at neutral pH is different from that at acidic pH, in which a commercial chlor-alkali process has been developed. Different proton concentrations and accelerated hydrolysis of the generated chlorine into hypochlorous acid at high pH can change the electrokinetics and stability of reaction intermediates. We have investigated a unique reaction mechanism of Co3O4 nanoparticles for chloride oxidation at neutral pH. In contrast with water oxidation, the valency of cobalt was not changed during chloride oxidation. Interestingly, a new intermediate of Co-Cl was captured spectroscopically, distinct from the reaction intermediate at acidic pH. In addition, Co3O4 nanoparticles exhibited high selectivity for active chlorine generation at neutral pH, comparable to commercially available RuO2-based catalysts. We believe that this study provides insight into designing efficient electrocatalysts for active chlorine generation at neutral pH, which can be practically applied to electrochemical water treatment coupled to hydrogen production. |
| Databáze: | OpenAIRE |
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