Enhanced Energy Density for P-Doped Hierarchically Porous Carbon-Based Symmetric Supercapacitor with High Operation Potential in Aqueous H<sub>2</sub>SO<sub>4</sub> Electrolyte
Phosphorus-doped hierarchically porous carbon (HPC) is prepared with the assistance of freeze-drying using colloid silica and phytic acid dipotassium salt as a hard template and phosphorus source, respectively. Intensive material characterizations show that the freeze-drying process can effectively...
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| Auteurs principaux: | , , , , , , , , |
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| Format: | article |
| Langue: | EN |
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MDPI AG
2021
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| Accès en ligne: | https://doaj.org/article/7142e4ad2e914d1a9febb3b54484984f |
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| Résumé: | Phosphorus-doped hierarchically porous carbon (HPC) is prepared with the assistance of freeze-drying using colloid silica and phytic acid dipotassium salt as a hard template and phosphorus source, respectively. Intensive material characterizations show that the freeze-drying process can effectively promote the porosity of HPC. The specific surface area and P content for HPC can reach up to 892 m<sup>2</sup> g<sup>−1</sup> and 2.78 at%, respectively. Electrochemical measurements in aqueous KOH and H<sub>2</sub>SO<sub>4</sub> electrolytes reveal that K<sup>+</sup> of a smaller size can more easily penetrate the inner pores compared with SO<sub>4</sub><sup>2</sup><sup>−</sup>, while the developed microporosity in HPC is conducive to the penetration of SO<sub>4</sub><sup>2−</sup>. Moreover, P-doping leads to a high operation potential of 1.5 V for an HPC-based symmetric supercapacitor, resulting in an enhanced energy density of 16.4 Wh kg<sup>−1</sup>. Our work provides a feasible strategy to prepare P-doped HPC with a low dosage of phosphorus source and a guide to construct a pore structure suitable for aqueous H<sub>2</sub>SO<sub>4</sub> electrolyte. |
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