Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi, Xinjiang 830011, China; Laboratory of Eco-Materials and Sustainable Technology (LEMST), Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi, Xinjiang 830011, China; School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China.
Laboratory of Eco-Materials and Sustainable Technology (LEMST), Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi, Xinjiang 830011, China; College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.
J Colloid Interface Sci. 2018 Jan 1;509:369-383. doi: 10.1016/j.jcis.2017.09.013. Epub 2017 Sep 7.
In this research, Rapeseed dregs (RDs), as a byproduct of agriculture (derived from processing of rapeseed for oil production), were originally employed asa new carbonaceous precursor to synthesize hierarchically porous and heteroatom-doped activated carbons (ACs) with the activation of ZnCl at various high temperatures. A variety of measurements have been adopted to systemically characterize the RD-derived ACs. The micro-morphology, pore structures and surface chemistry property were fully investigated by SEM, TEM, XRD, Raman, N adsorption-desorption analysis, XPS and IR, respectively. The RD-derived ACs possess as large specific surface area as up to 1416.966mg and the pore size distribution concentrates on 1-2, 2-5, 5-15 and 25-35nm, indicating their hierarchically porous structures. Furthermore, electrochemical measurements including electrochemical impedance spectroscopy (EIS), galvanostatic charge/discharge (GCD) and cyclic voltammetry (CV) were conducted to estimate RDAC's supercapacitive performance and rate capability. The investigations illustrated that RD derived ACs reached as high specific capacitance as 170.5 and 153.2Fg at a scan rate of 5mVs in 1M HSO and 1M EtNBF/AN, respectively. In addition, the RD-derived ACs demonstrated good long-term cycling stability and more than 90% initial capacity have been retained after 6400 cycles at a large current density of 1Ag.
在这项研究中，油菜籽渣（RDs）作为农业副产物（来源于油菜籽加工生产食用油），最初被用作一种新的碳质前体制备具有层次多孔和杂原子掺杂的活性炭（ACs），使用的活化剂为 ZnCl，在不同的高温下进行。采用了多种测量方法对 RD 衍生的 ACs 进行系统的表征。通过 SEM、TEM、XRD、拉曼、N 吸附-解吸分析、XPS 和 IR 分别充分研究了 RD 衍生的 ACs 的微观形貌、孔结构和表面化学性质。RD 衍生的 ACs 具有高达 1416.966mg 的比表面积，孔径分布集中在 1-2、2-5、5-15 和 25-35nm 之间，表明其具有层次多孔结构。此外，进行了包括电化学阻抗谱（EIS）、恒流充放电（GCD）和循环伏安法（CV）在内的电化学测量，以评估 RDAC 的超级电容性能和倍率性能。研究表明，RD 衍生的 ACs 在 1M HSO 和 1M EtNBF/AN 中的扫描速率分别为 5mVs 时，比电容高达 170.5 和 153.2Fg。此外，RD 衍生的 ACs 表现出良好的长期循环稳定性，在大电流密度为 1Ag 时，经过 6400 次循环后，初始容量保留率超过 90%。
