Dynamic carbon surface chemistry: Revealing the role of carbon in electrolytic water oxidation
| Autor: | Xing Huang, Qingqing Gu, Alexander Yu. Klyushin, Yuxiao Ding, Saskia Heumann, Ioannis Spanos, Pascal Düngen, Rik Mom, Sakeb H. Choudhury, Robert Schlögl, Feihong Song, Anna K. Mechler |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Chemistry
Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Oxygen 0104 chemical sciences Catalysis Fuel Technology Chemical engineering Impurity Electrode Water splitting 0210 nano-technology Carbon Energy (miscellaneous) |
| Zdroj: | Journal of Energy Chemistry |
| ISSN: | 2095-4956 |
| DOI: | 10.1016/j.jechem.2019.12.006 |
| Popis: | Carbon materials have been widely used as electrodes, but the mechanistic roles are still not clear due to the complexity of the carbon surface chemistry. Herein we clarify that intrinsic material properties of carbon have to be activated by extrinsic factors. Pure carbon has no catalytic activity when used as electrode for electrocatalytic water oxidation. The evolution of oxygen functional groups on the carbon surface with increasing potential and the subsequent formation of real active sites with iron impurities from the electrolyte have been confirmed. These in-situ formed active sites protect the carbon from deep oxidation. This unprecedented finding not only provides insight into the dynamic evolution of carbon electrode surface chemistry and raises awareness of the need for detailed surface analysis under operando conditions, but also suggests a direction for the development of scalable and high-performance carbon-based electrode systems for various electrochemical applications. |
| Databáze: | OpenAIRE |
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