A new synthetic approach to cobalt oxides: Designed phase transformation for electrochemical water splitting
| Autor: | Ha Young Kim, Haeun Jung, Syed Asad Abbas, Ahyeon Ma, So Yeong Jo, Ki Min Nam, Hye Rin Choe |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Spinel Oxygen evolution chemistry.chemical_element 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Catalysis chemistry Chemical engineering Phase (matter) engineering Environmental Chemistry Water splitting 0210 nano-technology Cobalt Cobalt oxide |
| Zdroj: | Chemical Engineering Journal. 415:127958 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2020.127958 |
| Popis: | The structural phase transformations of non-native hexagonal CoO (h-CoO) into various other cobalt oxides, such as cubic rock-salt CoO, spinel Co3O4, trigonal Co(OH)2, and trigonal CoOOH, were examined by controlling the reaction conditions. The transformation pathway of h-CoO for each cobalt oxide was fully elucidated. The prepared cobalt oxides were studied as catalysts for oxygen evolution reaction (OER) to clarify the structure-activity relationship. Among the cobalt oxide materials, spinel Co3O4 showed the best catalytic activity. Moreover, spinel Co3O4 was deposited directly via the oxidative phase transformation of h-CoO particles on a conductive substrate without additional coating processes. The efficient chemical adhesion of spinel Co3O4 via phase transformation indicated fast oxidation of Co3+ to Co4+, which resulted in improved OER activity. |
| Databáze: | OpenAIRE |
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