Mild fabrication of SiC/C nanosheets with prolonged cycling stability as supercapacitor
| Autor: | Tao Yang, Enhui Wang, Chunyu Guo, Liu Shichun, Hailong Wang, Shuang Liu, Xinmei Hou |
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| Rok vydání: | 2022 |
| Předmět: |
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Supercapacitor Fabrication Materials science Polymers and Plastics Mechanical Engineering Metals and Alloys chemistry.chemical_element Heterojunction chemistry.chemical_compound Hydrofluoric acid Chemical engineering chemistry Mechanics of Materials Etching (microfabrication) Electrode Materials Chemistry Ceramics and Composites Carbon |
| Zdroj: | Journal of Materials Science & Technology. 110:178-186 |
| ISSN: | 1005-0302 |
| DOI: | 10.1016/j.jmst.2021.09.012 |
| Popis: | A facile and mild route to synthesize C-coated SiC nanosheets (SiC/C NSs) via wet-chemical etching in hydrofluoric acid (HF) at 60 °C for 48 h using carbon aluminum silicate (Al4SiC4) as raw materials is reported for the first time. HF molecule leads to the breaking of C-Al bonds in Al4SiC4, which eventually results in the formation of two-dimensional SiC nanosheets. A carbon layer with a thickness of approximately 1.5 nm is formed on the surface of SiC nanosheets due to the excess carbon. The prepared SiC/C NSs possess a smooth and rectangular sheet with a mean 150 nm in width, 500 nm in length and 10 nm in thickness, respectively. The crystallographic characterization indicates that 3C-SiC and 2H-SiC coexist and the parallel plane relationship of 3C/2H-SiC heterojunction is (111)3C-SiC//(001)2H-SiC. Due to the formed 3C-SiC/2H-SiC heterojunction and graphitic carbon, the fabricated electrode based on SiC/C NSs exhibits prolonged cycling stability and high specific areal capacitance as a promising supercapacitor candidate. It remains 91.2% retention even after 20000 cycles and 734 μF/cm2 at a scan rate of 10 mV/s. |
| Databáze: | OpenAIRE |
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