Porous carbon materials have long been a research focus in supercapacitor electrode materials owing to their excellent electrical conductivity, high specific surface area, and good chemical stability. Herein, we propose an approach for the preparation of porous carbon materials using the ice crystal template method combined with carbonization and activation of chitosan and dopamine hydrochloride polymer networks as precursors. The effects of the ratio of precursors to KOH activator on the electrochemical performance of the materials are systematically studied. The results show that the optimized sample exhibited a high specific capacitance of 317.8 F g −1 . Furthermore, the device assembled with this material as the negative electrode and self-made Ni(OH) 2 as the positive electrode delivered energy density of 18.7 Wh kg −1 with capacitance retention of 96% after 10,000 cycles.
Deng et al. (Sat,) studied this question.