Lv Teng, Li Jun, Shi Yong, Yu Huan, Chen Jing
Wuhan Wuchang District Ecological Environment Monitoring Station Wuhan 430061 People's Republic of China
School of Environmental Studies, China University of Geosciences Wuhan 430074 People's Republic of China.
RSC Adv. 2023 Jul 31;13(33):23021-23029. doi: 10.1039/d3ra03605g. eCollection 2023 Jul 26.
Pyrolysis of sustainable biomass to advanced carbon materials for energy storage is key-enabling in energy and environmental sustainability. However, obtaining carbon materials with well-defined microstructure and composition for high-performance energy storage is extremely challenging. Herein, efficient activation of biomass carbon is realized by introducing extra metallurgical slag during pyrolysis of coconut shell in NaCO-KCO molten salt. The molten salt guides the formation of carbon with a hierarchical honeycomb-like nanostructure, while the metallurgical slag facilitates enhanced doping of the heteroatom species, conjointly contributing to the increase of the specific surface area of carbon materials from 424 m g to 1451 m g and the extension of the single N dopant to multiple dopants of N, P, Zn and Co. Such adequate tuning of the microstructure and composition in the pyrolysis product increases the capacitance for supercapacitors from 30 F g to 135 F g at 0.5 A g. The results can provide new insights for the controllable upgradation of both biomass and waste industrial slag toward enhanced energy storage.
将可持续生物质热解为用于能量存储的先进碳材料是实现能源与环境可持续发展的关键因素。然而，获得具有明确微观结构和组成以实现高性能能量存储的碳材料极具挑战性。在此，通过在NaCO-KCO熔盐中对椰壳进行热解过程中引入额外的冶金炉渣，实现了生物质碳的高效活化。熔盐引导形成具有分级蜂窝状纳米结构的碳，而冶金炉渣促进了杂原子物种的增强掺杂，共同促使碳材料的比表面积从424 m²/g增加到1451 m²/g，并将单一的N掺杂扩展到N、P、Zn和Co的多种掺杂。热解产物中微观结构和组成的这种充分调控使超级电容器在0.5 A/g电流密度下的电容从30 F/g增加到135 F/g。这些结果可为生物质和工业废渣向增强能量存储的可控升级提供新的见解。
