Hierarchical Nickel Cobalt Phosphide @ Carbon Nanofibers Composite Microspheres: Ultrahigh Energy Densities of Electrodes for Supercapacitors
Supercapacitors (SCs) are widely used in energy storage devices due to their superior power density and long cycle lifetime. However, the limited energy densities of SCs hinder their industrial application to a great extent. In this study, we present a new combination of metallic phosphide–carbon co...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-11-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/22/2927 |
| _version_ | 1797458167826743296 |
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| author | Jinqiao Zhang Meiling Cen Tao Wei Qianyun Wang Jing Xu |
| author_facet | Jinqiao Zhang Meiling Cen Tao Wei Qianyun Wang Jing Xu |
| author_sort | Jinqiao Zhang |
| collection | DOAJ |
| description | Supercapacitors (SCs) are widely used in energy storage devices due to their superior power density and long cycle lifetime. However, the limited energy densities of SCs hinder their industrial application to a great extent. In this study, we present a new combination of metallic phosphide–carbon composites, synthesized by directly carbonizing (Ni<sub>1−x</sub>Co<sub>x</sub>)<sub>5</sub>TiO<sub>7</sub> nanowires via thermal chemical vapor deposition (TCVD) technology. The new method uses one-dimensional (1D) (Ni<sub>1−x</sub>Co<sub>x</sub>)TiO<sub>7</sub> nanowires as precursors and supporters for the in situ growth of intertwined porous CNF microspheres. These 1D nanowires undergo microstructure transformation, resulting in the formation of CoNiP nanoparticles, which act as excellent interconnected catalytic nanoparticles for the growth of porous 3D CNF microspheres. Benefiting from the synergistic effect of a unique 1D/3D structure, the agglomeration of nanoparticles can effectively be prevented. The resulting CNF microspheres exhibit an interconnected conductive matrix and provide a large specific surface area with abundant ion/charge transport channels. Consequently, at a scanning rate of 10 mV s<sup>−1</sup>, its specific capacitance in 1.0 M Na<sub>2</sub>SO<sub>4</sub> + 0.05 M Fe(CN)<sub>6</sub><sup>3−/4−</sup> aqueous solution is as high as 311.7 mF cm<sup>−2</sup>. Furthermore, the CoNiP@CNFs composite film-based symmetrical SCs show an ultrahigh energy density of 20.08 Wh kg<sup>−1</sup> at a power density of 7.20 kW kg<sup>−1</sup>, along with outstanding cycling stability, with 87.2% capacity retention after 10,000 cycles in soluble redox electrolytes. This work provides a new strategy for designing and applying high-performance binary transition metal phosphide/carbon composites for next-generation energy storage devices. |
| first_indexed | 2024-03-09T16:34:10Z |
| format | Article |
| id | doaj.art-49e1f4ebd64d4f22b456f2be0e7b01ea |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T16:34:10Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-49e1f4ebd64d4f22b456f2be0e7b01ea2023-11-24T14:58:48ZengMDPI AGNanomaterials2079-49912023-11-011322292710.3390/nano13222927Hierarchical Nickel Cobalt Phosphide @ Carbon Nanofibers Composite Microspheres: Ultrahigh Energy Densities of Electrodes for SupercapacitorsJinqiao Zhang0Meiling Cen1Tao Wei2Qianyun Wang3Jing Xu4College of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaSupercapacitors (SCs) are widely used in energy storage devices due to their superior power density and long cycle lifetime. However, the limited energy densities of SCs hinder their industrial application to a great extent. In this study, we present a new combination of metallic phosphide–carbon composites, synthesized by directly carbonizing (Ni<sub>1−x</sub>Co<sub>x</sub>)<sub>5</sub>TiO<sub>7</sub> nanowires via thermal chemical vapor deposition (TCVD) technology. The new method uses one-dimensional (1D) (Ni<sub>1−x</sub>Co<sub>x</sub>)TiO<sub>7</sub> nanowires as precursors and supporters for the in situ growth of intertwined porous CNF microspheres. These 1D nanowires undergo microstructure transformation, resulting in the formation of CoNiP nanoparticles, which act as excellent interconnected catalytic nanoparticles for the growth of porous 3D CNF microspheres. Benefiting from the synergistic effect of a unique 1D/3D structure, the agglomeration of nanoparticles can effectively be prevented. The resulting CNF microspheres exhibit an interconnected conductive matrix and provide a large specific surface area with abundant ion/charge transport channels. Consequently, at a scanning rate of 10 mV s<sup>−1</sup>, its specific capacitance in 1.0 M Na<sub>2</sub>SO<sub>4</sub> + 0.05 M Fe(CN)<sub>6</sub><sup>3−/4−</sup> aqueous solution is as high as 311.7 mF cm<sup>−2</sup>. Furthermore, the CoNiP@CNFs composite film-based symmetrical SCs show an ultrahigh energy density of 20.08 Wh kg<sup>−1</sup> at a power density of 7.20 kW kg<sup>−1</sup>, along with outstanding cycling stability, with 87.2% capacity retention after 10,000 cycles in soluble redox electrolytes. This work provides a new strategy for designing and applying high-performance binary transition metal phosphide/carbon composites for next-generation energy storage devices.https://www.mdpi.com/2079-4991/13/22/2927supercapacitorscarbon nanofibersCoNiPelectrochemistry performance |
| spellingShingle | Jinqiao Zhang Meiling Cen Tao Wei Qianyun Wang Jing Xu Hierarchical Nickel Cobalt Phosphide @ Carbon Nanofibers Composite Microspheres: Ultrahigh Energy Densities of Electrodes for Supercapacitors Nanomaterials supercapacitors carbon nanofibers CoNiP electrochemistry performance |
| title | Hierarchical Nickel Cobalt Phosphide @ Carbon Nanofibers Composite Microspheres: Ultrahigh Energy Densities of Electrodes for Supercapacitors |
| title_full | Hierarchical Nickel Cobalt Phosphide @ Carbon Nanofibers Composite Microspheres: Ultrahigh Energy Densities of Electrodes for Supercapacitors |
| title_fullStr | Hierarchical Nickel Cobalt Phosphide @ Carbon Nanofibers Composite Microspheres: Ultrahigh Energy Densities of Electrodes for Supercapacitors |
| title_full_unstemmed | Hierarchical Nickel Cobalt Phosphide @ Carbon Nanofibers Composite Microspheres: Ultrahigh Energy Densities of Electrodes for Supercapacitors |
| title_short | Hierarchical Nickel Cobalt Phosphide @ Carbon Nanofibers Composite Microspheres: Ultrahigh Energy Densities of Electrodes for Supercapacitors |
| title_sort | hierarchical nickel cobalt phosphide carbon nanofibers composite microspheres ultrahigh energy densities of electrodes for supercapacitors |
| topic | supercapacitors carbon nanofibers CoNiP electrochemistry performance |
| url | https://www.mdpi.com/2079-4991/13/22/2927 |
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