KOH-Activated Porous Carbons Derived from Chestnut Shell with Superior Capacitive Performance
KOH-Activated Porous Carbons Derived from Chestnut Shell with Superior Capacitive Performance
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源自栗壳的 KOH 活化多孔碳具有卓越的电容性能
DOI：
10.1002/cjoc.201600320
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发表时间：
2016-11-01
影响因子：
5.4
通讯作者：
Zhuo, Shuping
中科院分区：
文献类型：
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作者：
Jiang, Man;Zhang, Jingli;Zhuo, Shuping
以废弃生物质板栗壳为原料，采用碳化和KOH活化两步法制备多孔炭（PC）。采用扫描电子显微镜（SEM）、氮气吸附、拉曼光谱、X射线衍射（XRD）和X射线光电子能谱（XPS）等测试手段对样品的形貌、孔结构和表面化学性质进行了研究。在6 mol/LKOH电解液中，采用双电极系统对碳材料作为超级电容器电极材料进行了评价。利用板栗壳的多孔结构、高比表面积和高氧含量，在0.1A·g（-1）的电流密度下，其比电容分别为198.2（PC-1）、217.2（PC-2）和238.2F·g（-1）（PC-3），倍率性能为55.7%，在0.1-20 A.g（-1）范围内，在5.6、6.1和6.7的高能量密度下，分别为56.6%和54.9%Wh.kg。这被认为是由于丰富的微孔诱导的双电层电容和含氧基团产生的额外的赝电容。在功率密度为9000（-1）时，PC-1、PC-2和PC-3的能量密度分别为3.1、3.5和3.7 Wh.kg（-1），证明了源自栗子壳的碳在能量储存装置中的潜力。Wh.kg
Porous carbons (PC) were prepared from a waste biomass named chestnut shell via a two-step method involving carbonization and KOH activation. The morphology, pore structure and surface chemical properties were investigated by scanning electron microscopy (SEM), N-2 sorption, Raman spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The carbons have been evaluated as the electrode materials for supercapacitors by a two-electrode system in 6 mol/L KOH electrolyte. Benefiting from the porous texture, high surface area and high oxygen content, the PCs derived from chestnut shell have exhibited high specific capacitance of 198.2 (PC-1), 217.2 (PC-2) and 238.2 F.g(-1) (PC-3) at a current density of 0.1 A.g(-1), good rate capability of 55.7%, 56.6% and 54.9% in a range of 0.1-20 A.g(-1) and high energy density of 5.6, 6.1 and 6.7 Wh.kg(-1), respectively. This is believed to be due to electric double layer capacitance induced by the abundant micropores and extra pseudo-capacitance generated by oxygen-containing groups. At a power density of 9000 Wh.kg(-1), the energy density is 3.1, 3.5 and 3.7 Wh.kg(-1) for PC-1, PC-2 and PC-3, respectively, demonstrating the potential of the carbons derived from chestnut shells in energy storage devices.