H_3PO_4 solution hydrothermal carbonization combined with KOH activation to prepare argy wormwood-based porous carbon for high-performance supercapacitors

摘要

In this work, argy wormwood-based porous carbon electrode materials for high-performance supercapacitors are prepared through H3PO4 solution hydrothermal carbonization and subsequent KOH activation. The obtained carbon has a specific surface area (SSA) of 927 m(2) g(-1), a total pore volume of 0.56 cm(3) g(-1), and a high oxygen (9.38%) content. In three-electrode system, it exhibits specific capacitance of 344 F g(-1) at 1 A g(-1). Moreover, the symmetric supercapacitor shows an excellent rate capability of 87% retention from 1 A g(-1) to 10 A g(-1), and a good cycling performance with 91.6% retention over 5000 cycles in 6 M KOH. Therefore, the sample activated by H3PO4 & KOH exhibits an excellent future in energy storage. (C) 2018 Elsevier B.V. All rights reserved.