Metal-organic frameworks as template for synthesis of Mn3+/Mn4+ mixed valence manganese cobaltites electrocatalysts for oxygen evolution reaction
| Autor: | C. Chesman, Thiago A. Simões, U.C. Silva, Fausthon Fred da Silva, Vinícius D. Silva, Annaíres A. Lourenço, Carlos Henrique Salvador, R.B. da Silva, Daniel A. Macedo |
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| Rok vydání: | 2021 |
| Předmět: |
Valence (chemistry)
Materials science Inorganic chemistry Oxygen evolution chemistry.chemical_element 02 engineering and technology Manganese Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry chemistry X-ray photoelectron spectroscopy Metal-organic framework Methanol 0210 nano-technology Cobalt |
| Zdroj: | Journal of Colloid and Interface Science. 582:124-136 |
| ISSN: | 0021-9797 |
| Popis: | Cobalt-based oxides are among the most promising electrocatalysts for oxygen evolution reactions (OER). In this context, this work reports the synthesis of manganese-doped cobaltites using the Zeolitic-Imidazolate Frameworks 67 (ZIF-67) as template. The incorporation of manganese ions into ZIF-67 structure was evaluated in ethanol and methanol, in order to obtain the best synthetic route. Non-doped (ZIF-67C) and Mn-doped cobaltites (Mn/ZIF-67C(E) and Mn/ZIF-67C(M)) were obtained after thermal treatment at 350 °C. Structural and morphological properties were investigated and presence of Mn3+ and Mn4+ was confirmed by X-ray photoelectron spectroscopy (XPS) data and magnetization curves. The electrocatalytic activity in OER was investigated in alkaline medium for manganese cobaltites, and compared to the ZIF-67C. Overpotentials to generate a current of 10 mA cm−2 were 338 mV and 356 mV for Mn/ZIF-67C(E) and Mn/ZIF-67C(M), respectively. These results are superior to those found for similar materials in the literature. The material obtained in methanol (Mn/ZIF-67C(M)) presents lower overpotential, however, shows superior electrocatalytic performance for current density above 100 mA cm−2, therefore being an efficient electrode for commercial electrolysers. |
| Databáze: | OpenAIRE |
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