Wu HYuan WZhao YHan DYuan XCheng L2024-07-282024-07-282019-01-11Wu H, Yuan W, Zhao Y, Han D, Yuan X, Cheng L. (2019). B, N-dual doped sisal-based multiscale porous carbon for high-rate supercapacitors.. RSC Adv. 9. 3. (pp. 1476-1486).2046-2069https://mro.massey.ac.nz/handle/10179/71125B, N dual-doped sisal-based activated carbon (BN-SAC) with a multiscale porous structure for high-rate supercapacitor electrode was prepared through a novel and facile strategy. With the inherent cellular channels serving as primary macropores, secondary mesopores and micropores are generated on the fiber surface and tracheid walls through low-pressure rapid carbonization of (NH4)2B4O7-containing sisal fibers and successive KOH activation. In addition to introducing B, N atoms into the BN-SAC, the additive also facilitates the formation of mesopores due to the rapid gas evaporation during its decomposition, leading to significantly increased specific surface area (2017 m2 g-1) and mesoporosity (68.6%). As a result, the BN-SAC-3 shows highly enhanced electrochemical performance including a high specific capacitance of 304 F g-1, excellent rate capability (with 72.6% retention at 60 A g-1) and superior cycling stability (4.6% capacitance loss after 3000 cycles). After assembling the BN-SAC-3 into symmetric supercapacitor, it shows a specific capacitance of 258 F g-1 at 1 A g-1 with 76.4% retention at 40 A g-1 in 6 M KOH electrolyte, and delivers a maximum energy density of 24.3 W h kg-1 at a power density of 612.8 W kg-1 in 1 M TEABF4/AN electrolyte. This work provides a new strategy for the synthesis of multiscale porous ACs for high-performance supercapacitors or other energy storage and conversion devices and is expected to be applied on other biomasses for large-scale production.© The Royal Society of Chemistry 2019CC BY-NC 3.0https://creativecommons.org/licenses/by-nc/3.0/Journal article10.1039/c8ra09663e2046-2069journal-article1476-1486https://www.ncbi.nlm.nih.gov/pubmed/35518021c8ra09663e