N‑doped Hierarchical Mesoporous Carbon from Mesophase Pitch and Polypyrrole for Supercapacitors
journal contributionposted on 19.03.2020 by Mengxuan Liu, Wei Li, Siying Ruan, Youqing Fei
Any type of content formally published in an academic journal, usually following a peer-review process.
N-doped hierarchical mesoporous carbons have been fabricated by using mesophase pitch (MP) as a carbon precursor and polypyrrole as a nitrogen resource through the MCM-48 template. Carbonization temperature plays a key role in the morphology, mesoporous structure, and electrochemical properties of N-doped porous carbons (NPCs). At an appropriate carbonization temperature (700 °C), as-prepared NPC-700 exhibits rich nitrogen content (4.48 wt %), medium specific surface area (495.9 m2 g–1), and high specific capacitance of 232.2 F g–1 at a current density of 2 A g–1 in a three-electrode system. Due to the generation of pseudocapacitance, the specific capacitance of NPC-700 is 53.6 F g–1 higher than that of PC-700 without polypyrrole. In addition, NPC-700 shows high specific capacitance of 110.6 F g–1 at a current density of 0.2 A g–1, a good capacitance retention of 77.8% at the current density of 5 A g–1, and the large energy density of 15.30 Wh kg–1 at a power density of 399.9 W kg–1 in a two-electrode system. This work provides a novel example of how N-doped porous carbons derived from mesophase pitch and polypyrrole can be used as a promising electrode material for potential energy storage applications.