生物质花瓣衍生的氮掺杂多孔碳材料制备及性能研究

Preparation and Properties of Nitrogen-Doped Porous Carbon Materials Derived from Biomass Petals

摘要:

多孔碳材料因具有大的比表面积、可控的孔径分布及优良的电导率，被认为是超级电容器的一种理想材料。基于熔盐策略，一步将生物质（花瓣）与尿素分子制备成氮掺杂多孔碳材料。结果表明：所合成的多孔碳具有丰富的微孔及中孔，比表面积高达633.6 m²?g^-1；氮元素均匀地掺杂在多孔碳中，增加了多孔碳表面的活性位点、表面极性、电导率等，同时提升了多孔碳的比电容和离子传输能力，显著降低了电阻，在1 A?g^-1的电流密度下氮掺杂多孔碳的比电容为204.4 F?g^-1，而未掺杂的多孔碳的比电容仅为149.9 F?g^-1。为氮掺杂多孔碳材料的制备提供了一种绿色、高效的合成策略，可用于超级电容器领域中。

Abstract:

Porous carbon materials are considered an ideal material for supercapacitors due to their large specific surface area， controllable pore size distribution， and excellent electrical conductivity. In this paper， nitrogen-doped porous carbon materials were prepared from biomass （petals） and urea molecules in one step based on the molten salt strategy. The results show that the synthesized porous carbon material has abundant micropores and mesoporous， with a large specific surface area of 633.6 m²?g^-1. The nitrogen is uniformly doped into the porous carbon， which not only increases the active sites， surface polarity， and electrical conductivity of the porous carbon surface， but also improves the specific capacitance and the ion transport ability of the porous carbon， and significantly reduces the electrical resistance. The specific capacitance of nitrogen-doped porous carbon is 204.4 F?g^-1 at a current density of 1 A?g^-1， while that of undoped porous carbon is only 149.9 F?g^-1. This work provides a green and efficient synthesis strategy for nitrogen-doped porous carbon materials， which can be used in the field of supercapacitors.