Enhanced electrochemical performance of wood derived carbon-based supercapacitor electrodes by freezing and thawing pretreatment salt template method
Hongda Zeng, Jian Zhang, Lin Lin, Jing Liu, Junyou Shi
Abstract
Wood-derived carbon electrode materials have become an important research field because of their renewable properties. However, there is relatively little research on the physicochemical co-treatment of microporous structures in wood. In this paper, the electrode material of supercapacitor was prepared from wood by freezing and thawing combined with the salt template method. Compared with other methods, freeze-thaw/salt template co-treatment process is simple and environmentally friendly, and the cost is low. The results show that the areal specific capacitance of freeze-thawed wood-based carbon material (FCW-LiCl) treated with LiCl as the salt template is 3725 mF cm −2 (0.5 mA cm −2 ), which is 40 times that of the untreated material. The specific capacitance of the FCW-LiCl supercapacitor is 1831.25 mF cm −2 and when the power density is 2.03 mW cm −2 , the energy density is 0.26 mWh cm −2 . After 10,000 cycles (20 mA cm −2 ), the capacitor retention rate of the supercapacitor is as high as 114.28 %, with excellent pore structure and electrochemical performance. This provides a new green, energy-efficient and environmentally friendly way for the high-value use of wood and other cash crops.