Crystalline Cobalt Oxide Films for Sustained Electrocatalytic Oxygen Evolution under Strongly Acidic Conditions
| Autor: | Juan F. Callejas, Carlos G. Read, Cameron F. Holder, Catherine K. Badding, Jamie Y. C. Chen, Jared S. Mondschein, Raymond E. Schaak |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
General Chemical Engineering Inorganic chemistry Oxygen evolution chemistry.chemical_element 02 engineering and technology General Chemistry Electrolyte Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Tin oxide 01 natural sciences Oxygen 0104 chemical sciences Catalysis chemistry Electrode Materials Chemistry 0210 nano-technology Cobalt oxide |
| Zdroj: | Chemistry of Materials. 29:950-957 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.6b02879 |
| Popis: | Earth-abundant materials capable of catalyzing the electrochemical decomposition of water into molecular hydrogen and oxygen are necessary components of many affordable water-splitting technologies. However, water oxidation catalysts that facilitate sustained oxygen evolution at device-relevant current densities in strongly acidic electrolytes have been limited almost exclusively to precious metal oxides. Here, we show that nanostructured films of cobalt oxide (Co3O4) on fluorine-doped tin oxide (FTO) substrates, made by first depositing Co onto FTO and heating in air at 400 °C to produce films having a robust electrical and mechanical Co3O4/FTO interface, function as active electrocatalysts for the oxygen evolution reaction (OER) in 0.5 M H2SO4. The Co3O4/FTO electrodes evolve oxygen with near-quantitative Faradaic yields and maintain a current density of 10 mA/cm2 for over 12 h at a moderate overpotential of 570 mV. At lower current densities that require lower overpotentials, sustained oxygen productio... |
| Databáze: | OpenAIRE |
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