Highly Porous Carbon Materials Derived from Silicon Oxycarbides and Effect of the Pyrolysis Temperature on Their Electrochemical Response
The 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...
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MDPI AG
2023-09-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/24/18/13868 |
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| author | Jose Merida Maria T. Colomer Fausto Rubio M. Alejandra Mazo |
| author_facet | Jose Merida Maria T. Colomer Fausto Rubio M. Alejandra Mazo |
| author_sort | Jose Merida |
| collection | DOAJ |
| description | The 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 (C<sub>s</sub> = 101 Fg<sup>−1</sup> (0.2 Ag<sup>−1</sup>)), energy (E<sub>d</sub> = 12–7 Wh<sup>−1</sup> kg<sup>−1</sup>), and power densities (P<sub>d</sub> = 0.32–35 kw kg<sup>−1</sup>), showing a good capacitance retention ratio up to 98% after 10,000 charge–discharge cycles at 0.5 Ag<sup>−1</sup>. 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 C<sub>s</sub>, E<sub>d</sub>, and P<sub>d</sub> values. |
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| series | International Journal of Molecular Sciences |
| spelling | doaj.art-d9baf14ae364499481f8f16c360937092023-11-19T11:04:22ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672023-09-0124181386810.3390/ijms241813868Highly Porous Carbon Materials Derived from Silicon Oxycarbides and Effect of the Pyrolysis Temperature on Their Electrochemical ResponseJose Merida0Maria T. Colomer1Fausto Rubio2M. Alejandra Mazo3Departamento de Ingeniería Química, Universidad Autónoma de Madrid, C/Tomás y Valiente 7, 28049 Madrid, SpainInstituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Científicas, C/Kelsen 5, 28049 Madrid, SpainInstituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Científicas, C/Kelsen 5, 28049 Madrid, SpainInstituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Científicas, C/Kelsen 5, 28049 Madrid, SpainThe 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 (C<sub>s</sub> = 101 Fg<sup>−1</sup> (0.2 Ag<sup>−1</sup>)), energy (E<sub>d</sub> = 12–7 Wh<sup>−1</sup> kg<sup>−1</sup>), and power densities (P<sub>d</sub> = 0.32–35 kw kg<sup>−1</sup>), showing a good capacitance retention ratio up to 98% after 10,000 charge–discharge cycles at 0.5 Ag<sup>−1</sup>. 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 C<sub>s</sub>, E<sub>d</sub>, and P<sub>d</sub> values.https://www.mdpi.com/1422-0067/24/18/13868hierarchical porous materialsmicro-meso-macroporous materialssilicon oxycarbide carbon derived materialschlorine etchingRaman parameterssupercapacitor applications |
| spellingShingle | Jose Merida Maria T. Colomer Fausto Rubio M. Alejandra Mazo Highly Porous Carbon Materials Derived from Silicon Oxycarbides and Effect of the Pyrolysis Temperature on Their Electrochemical Response International Journal of Molecular Sciences hierarchical porous materials micro-meso-macroporous materials silicon oxycarbide carbon derived materials chlorine etching Raman parameters supercapacitor applications |
| title | Highly Porous Carbon Materials Derived from Silicon Oxycarbides and Effect of the Pyrolysis Temperature on Their Electrochemical Response |
| title_full | Highly Porous Carbon Materials Derived from Silicon Oxycarbides and Effect of the Pyrolysis Temperature on Their Electrochemical Response |
| title_fullStr | Highly Porous Carbon Materials Derived from Silicon Oxycarbides and Effect of the Pyrolysis Temperature on Their Electrochemical Response |
| title_full_unstemmed | Highly Porous Carbon Materials Derived from Silicon Oxycarbides and Effect of the Pyrolysis Temperature on Their Electrochemical Response |
| title_short | Highly Porous Carbon Materials Derived from Silicon Oxycarbides and Effect of the Pyrolysis Temperature on Their Electrochemical Response |
| title_sort | highly porous carbon materials derived from silicon oxycarbides and effect of the pyrolysis temperature on their electrochemical response |
| topic | hierarchical porous materials micro-meso-macroporous materials silicon oxycarbide carbon derived materials chlorine etching Raman parameters supercapacitor applications |
| url | https://www.mdpi.com/1422-0067/24/18/13868 |
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