A pre-burning treatment facilitating formation of pores in biochars and reinforcing their electrochemical performance in supercapacitor.

Autor: Ye, Jiankang, Fu, Qingshan, Ye, Ang, Xu, Changkangle, Zhou, Feiyu, Chen, Xuedan, Zhu, Wenli, Chen, Jian
Zdroj: Ionics; Mar2024, Vol. 30 Issue 3, p1677-1690, 14p
Abstrakt: Continuous efforts are always being made to reinforce biochars' properties for large-scale utilization in new energy devices. Here, a pre-burning treatment is introduced for preparing the biochars from shaddock peel, longan pericarp, and loofah sponge. The results of XRD demonstrate more disordered structures are caused in the prepared biochars by the pre-burning, which also introduces more oxygen-containing functional groups on the biochars' surface discovered by the FTIR and XPS tests. The N2 adsorption–desorption results indicate that the pre-burning can facilitate pore formation in the biochars, boosting specific surface area and pore volume, significantly reducing the average pore size of biochars. Specifically, for the loofah sponge based biochar, the pre-burning treatment causes an increase in specific surface area (from 271 to 973 m2 g−1), a rise in pore volume (from 0.22 to 0.53 cm3 g−1), and a decrease in average pore diameter (from 3.21 to 2.3 nm). The specific capacitance of the supercapacitor with the loofah sponge based biochar electrodes is raised from 85.4 to 170 F g−1at 0.5 A g−1 by the pre-burning treatment. Besides, the longan pericarp-derived biochar with the pre-burning treatment achieves a power density of 5000 W kg−1 under an energy density of 21.81 Wh kg−1. We believe the pre-burning treatment is an effective and convenient route for the reinforcement of biochars. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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