Synergetic interaction between copper and carbon impurity induces low temperature growth of highly-defective graphene for enhanced electrochemical performance
| Autor: | Yi Xi, Wenbin Zhao, Jing Li, Wei Quan Tian, Zegao Wang, Yan Jin, Xuesong Li, Baoshan Hu, Qian Yang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Graphene chemistry.chemical_element 02 engineering and technology General Chemistry Chemical vapor deposition 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Copper 0104 chemical sciences Catalysis law.invention Crystallinity chemistry Chemical engineering Impurity law Cluster (physics) General Materials Science 0210 nano-technology |
| Zdroj: | Zhao, W, Hu, B, Yang, Q, Wang, Z, Li, X, Jin, Y, Xi, Y, Li, J & Tian, W Q 2019, ' Synergetic interaction between copper and carbon impurity induces low temperature growth of highly-defective graphene for enhanced electrochemical performance ', Carbon, vol. 150, pp. 371-377 . https://doi.org/10.1016/j.carbon.2019.05.046 |
| ISSN: | 0008-6223 |
| Popis: | Defect-engineering of few-layer graphene, by modulating local electronic structure and forming highly-active reaction sites, benefits the charge storage and electrochemical reactions. To control defect morphology of graphene, herein, we devise a CH4- chemical vapor deposition (CVD) approach to directly synthesize graphene film with extremely high defect density of 5.9 × 1011 cm−2 and relatively high crystallinity at a low temperature of 700 °C. The C atoms involved in Cu bulk are induced to segregate onto the Cu surface to establish synergetic C–Cu complex catalyst. Theoretical evidence verifies that the interaction between the Cu and C atoms in form of C cluster atop the Cu plane lowers energy barriers for stepwise decomposition of CH4. The 13CH4 isotope data demonstrate that the C clusters are integrated sequentially into the graphene lattice, unraveling the dual roles of carbon impurities. The defective graphene film exhibits a specific capacitance of 10.6 μF/cm2 and excellent electro-catalytic performance. Such a self-induced synergetic catalyst can innovate the methodology of catalysis engineering for controllable synthesis of graphene and other 2D materials. |
| Databáze: | OpenAIRE |
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