Boosting oxygen evolution of single-atomic ruthenium through electronic coupling with cobalt-iron layered double hydroxides
| Autor: | Xiaopeng Cheng, Qing Ma, Pengsong Li, Zhenxing Feng, Xiaoming Sun, Maoyu Wang, Yaping Li, Lirong Zheng, Wen Liu, Xinxuan Duan, Yuefei Zhang, Yun Kuang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Materials science Science Inorganic chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Overpotential engineering.material Electrocatalyst General Biochemistry Genetics and Molecular Biology Article 03 medical and health sciences lcsh:Science Tafel equation Multidisciplinary Layered double hydroxides Oxygen evolution General Chemistry 021001 nanoscience & nanotechnology Ruthenium 030104 developmental biology chemistry engineering Water splitting lcsh:Q 0210 nano-technology Cobalt |
| Zdroj: | Nature Communications Nature Communications, Vol 10, Iss 1, Pp 1-11 (2019) |
| ISSN: | 2041-1723 |
| Popis: | Single atom catalyst, which contains isolated metal atoms singly dispersed on supports, has great potential for achieving high activity and selectivity in hetero-catalysis and electrocatalysis. However, the activity and stability of single atoms and their interaction with support still remains a mystery. Here we show a stable single atomic ruthenium catalyst anchoring on the surface of cobalt iron layered double hydroxides, which possesses a strong electronic coupling between ruthenium and layered double hydroxides. With 0.45 wt.% ruthenium loading, the catalyst exhibits outstanding activity with overpotential 198 mV at the current density of 10 mA cm−2 and a small Tafel slope of 39 mV dec−1 for oxygen evolution reaction. By using operando X-ray absorption spectroscopy, it is disclosed that the isolated single atom ruthenium was kept under the oxidation states of 4+ even at high overpotential due to synergetic electron coupling, which endow exceptional electrocatalytic activity and stability simultaneously. While water splitting offers a carbon-neutral means to store energy, water oxidation is sluggish and corrosive over earth-abundant electrocatalysts. Here, authors show single ruthenium atoms over cobalt-iron layered double hydroxides to be effective and stable oxygen evolution electrocatalysts. |
| Databáze: | OpenAIRE |
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