Organic salt-derived phosphorus-doped mesoporous carbon for high performance supercapacitors

Phosphorus-doped mesoporous carbons (PMCs) were prepared using a self-doping and self-templating approach via direct pyrolysis of sodium phytate (C 6 H 17 NaO 24 P 6 ). The one-pot method allows simultaneous carbonization and P doping, eliminating the need for pre-synthesis or post-activation treatment. The C 6 H 17 NaO 24 P 6 is the source of both carbon and phosphorus, and the nano-Na 4 P 2 O 7 particles produced during pyrolysis act as hard templates for the honeycomb mesoporous structure with high specific surface area (884-827 m 2 /g), large mesopore volume ratio (67-75%) and rich phosphorus content (0.53-2.34 at%). As electrodes of supercapacitors in 6 mol/L KOH, the PMCs showed outstanding performance with a high capacitance of 202 F/g and excellent rate performance of 148 F/g at 30 A/g. In addition, the PMCsbased symmetrical supercapacitors can operate in an expanded working voltage of 0-1.6 V in 3 mol/L H 2 SO 4 aqueous electrolytes with high-density energy of 11.8 Wh/kg.& COPY; 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

Automated summary

Phosphorus-doped mesoporous carbons (PMCs) were synthesized through a one-pot method using sodium phytate as the precursor. The resulting PMCs exhibited a honeycomb mesoporous structure with high specific surface area, large mesopore volume ratio, and rich phosphorus content. As supercapacitor electrodes, the PMCs showed excellent performance with high capacitance and rate capability. Furthermore, the symmetric supercapacitors based on PMCs operated at an expanded working voltage range and achieved high-energy density in sulfuric acid electrolytes.