超级电容器
介孔材料
材料科学
电解质
化学工程
碳纤维
多孔性
生物量(生态学)
电容
离子液体
储能
比能量
纳米技术
离子键合
电极
复合材料
催化作用
有机化学
化学
离子
物理
地质学
工程类
海洋学
物理化学
复合数
功率(物理)
量子力学
作者
Jianhua Hou,Kun Jiang,Muhammad Bilal Tahir,Xiaoge Wu,Faryal Idrees,Ming Shen,Chen Cao
标识
DOI:10.1016/j.jpowsour.2017.10.045
摘要
The development of green and clean synthetic techniques to overcome energy requirements have motivated the researchers for the utilization of sustainable biomass. Driven by this desire we choose rice as starting materials source. After the explosion effect, the precursor is converted into puffed rice with a honeycomb-like structures composed of thin sheets. These honeycomb-like macrostructures, effectively prevent the cross-linking tendency towards the adjacent nanosheets during activation process. Furthermore, tuneable micro/mesoporous structures with ultrahigh specific surface areas (SBET) are successfully designed by KOH activation. The highest SBET of 3326 m2 g−1 with optimized proportion of small-mesopores is achieved at 850 °C. The rice-derived porous N-doped carbon nanosheets (NCS-850) are used as the active electrode materials for supercapacitors. It exhibites high specific capacitance specifically of 218 F g−1 at 80 A g−1 in 6 M KOH and a high-energy density of 104 Wh kg−1 (53 Wh L−1) in the ionic liquid electrolytes. These are the highest values among the reported biomass-derived carbon materials for the best of our knowledge. The present work demonstrates that the combination of “puffing effect” and common chemical activation can turn natural products such as rice into functional products with prospective applications in high-performance energy storage devices.
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