Palladium single atoms supported by interwoven carbon nanotube and manganese oxide nanowire networks for enhanced electrocatalysis
| Autor: | Yu Sun, Kenichi Kato, Yonghui Zhao, Zheng Jiang, Zhijun Ning, Weikai Xiang, Du Fuping, Jing Qian, Xiaopeng Li, Miho Yamauchi, Yuhan Sun, Hao Zhang, Peng Gao |
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| Rok vydání: | 2018 |
| Předmět: |
Nanocomposite
Materials science Renewable Energy Sustainability and the Environment Nanowire Oxide chemistry.chemical_element 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences law.invention Catalysis chemistry.chemical_compound chemistry Chemical engineering law General Materials Science 0210 nano-technology Bifunctional Palladium |
| Zdroj: | Journal of Materials Chemistry A. 6:23366-23377 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c8ta09034c |
| Popis: | Advancement of electrocatalysts relies on the construction of both a highly efficient catalytic center and a highly conductive network support. Herein, we prepared a 3D interwoven structure with Pd atoms deposited on homogeneously bound MnO2 nanowires and carbon nanotubes (CNTs) (Pd/MnO2–CNT), allowing the combination of superior catalytic performance of atomic Pd incorporated in the metal oxide and the high conductivity of CNT. Using this nanocomposite, stable bifunctional oxygen reduction/evolution reaction (ORR/OER) was achieved. Pd/MnO2–CNT displayed a large Pd mass activity for ORR, which is two magnitudes higher than that of Pd/CNT and 5-fold higher than that of the state-of-the-art Pd-based electrocatalysts operated in alkaline medium. Application of this composite catalyst in Zn–air batteries generates significantly high efficiency and cycling stability. Experimental and theoretical studies revealed that MnO2 provided stronger electronic metal–support interaction than CNT. Pd single atoms doped in MnO2 work synergistically with the surrounding metal sites to activate molecular oxygen, and display optimized binding strength to reaction intermediates. Our strategy can be generalized to design new single atom electrocatalysts for numerous functionalities. |
| Databáze: | OpenAIRE |
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