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Título: | Highly Porous Carbon Materials Derived from Silicon Oxycarbides and Effect of the Pyrolysis Temperature on Their Electrochemical Response |
Autor: | Mérida, José; Colomer, María T. CSIC ORCID ; Rubio Alonso, Fausto CSIC ORCID ; Mazo Fernández, María Alejandra CSIC ORCID | Palabras clave: | Hierarchical porous materials Micro-meso-macroporous materials Silicon oxycarbide carbon derived materials Chlorine etching Raman parameters Supercapacitor applications |
Fecha de publicación: | 8-sep-2023 | Editor: | Molecular Diversity Preservation International | Citación: | International Journal of Molecular Sciences 2023, 24(18), 13868 | Resumen: | [EN] he design of a material porous microstructure with interconnected micro-meso-macropores is a key issue for the successful development of carbon-derived materials for supercapacitor applications. Another important issue is the nature of these carbon materials. For those reasons, in this study, novel hierarchical micro-meso-macroporous silicon oxycarbide-derived carbon (SiOC-DC) was obtained via chlorine etching of carbon-enriched SiOC prepared via pyrolysis (1100–1400 °C) of sol-gel triethoxysilane/dimethyldiphenysiloxane hybrids. In addition, and for the first time, non-conventional Raman parameters combined with the analysis of their microstructural characteristics were considered to establish their relationships with their electrochemical response. The sample pyrolyzed at 1100 °C showed planar and less-defective carbon domains together with the largest specific surface area (SSA) and the highest volume of micro-meso-macropores, which upgraded their electrochemical response. This sample has the highest specific capacitance (Cs = 101 Fg−1 (0.2 Ag−1)), energy (Ed = 12–7 Wh−1 kg−1), and power densities (Pd = 0.32–35 kw kg−1), showing a good capacitance retention ratio up to 98% after 10,000 charge–discharge cycles at 0.5 Ag−1. At a pyrolysis temperature ≥ 1200 °C, the carbon domains were highly ordered and tortuous with a high degree of interconnection. However, SSA and pore volumes (micro-meso-macropores) were significantly reduced and downgraded the Cs, Ed, and Pd values. | Versión del editor: | https://doi.org/10.3390/ijms241813868 | URI: | http://hdl.handle.net/10261/349403 | DOI: | 10.3390/ijms241813868 | ISSN: | 1661-6596 | E-ISSN: | 1422-0067 |
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Merida_Highly_ijms-24-13868-v2.pdf | Artículo principal | 4,51 MB | Adobe PDF | Visualizar/Abrir |
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