One-pot synthesis of etched CoMn-layered double hydroxides efficient for oxygen evolution reaction
| Autor: | Zixiao Yi, Man Zhang, Yiran Lu, Kai Yan, Chenlu Ye, Yuqian Liu, Lin Zhang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Tafel equation
Materials science One-pot synthesis Oxygen evolution Layered double hydroxides General Physics and Astronomy Ammonium fluoride 02 engineering and technology Surfaces and Interfaces General Chemistry Overpotential engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Exfoliation joint Isotropic etching 0104 chemical sciences Surfaces Coatings and Films chemistry.chemical_compound Chemical engineering chemistry engineering 0210 nano-technology |
| Zdroj: | Applied Surface Science. 480:256-261 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2019.02.227 |
| Popis: | One-pot synthesis of etched thin CoMn-layered double hydroxides (LDHs) is successfully achieved via the in-situ ammonium fluoride etching at room temperature. The facile methodology developed here avoids the traditionally hydrothermal treatment and the complex exfoliation procedure. The as-prepared etched CoMn-LDHs of ~9.3 nm exhibit excellent performance in the oxygen evolution reaction, whereas the etched CoMn-LDHs display a reduction of 150 mV overpotential at 10 mA cm−2 compared to the state-of-the-art RuO2 in 0.1 M NaOH. Besides, the etched CoMn-LDHs display much smaller Tafel slope and resistance than that of non-etched CoMn-LDHs. Compared with the traditional method, the as-developed in-situ chemical etching is much more efficient with additional advantages of producing highly active sites. More importantly, density functional theory (DFT) has confirmed the experimental results and documented that the much enhanced electrocatalytic activity of thin CoMn-LDHs is associated with a nearly optimal intermediates (*OH and *O) adsorption energy. |
| Databáze: | OpenAIRE |
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