Lin Xiao-Qiang, Lü Qiu-Feng, Li Qin, Wu Mengchen, Liu Rui
Key Laboratory of Eco-materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, 2 Xueyuan Road, Fuzhou 350116, China.
Ministry of Education Key Laboratory of Advanced Civil Engineering Material, School of Materials Science and Engineering, and Institute for Advanced Study, Tongji University, 4800 Cao'an Road, Shanghai 201804, China.
ACS Omega. 2018 Oct 16;3(10):13283-13289. doi: 10.1021/acsomega.8b01718. eCollection 2018 Oct 31.
Low-cost and ecofriendly porous biocarbons were fabricated from konjaku flour via precarbonization and potassium hydroxide (KOH) activation. The obtained biocarbon AC-5 derived from a precarbonized carbon/potassium hydroxide (KOH) mass ratio of 1:5 possessed an ultrahigh specific surface area of 1403 m g and hierarchical porous structures with the existence of micro- to macropores. When AC-5 was employed as a supercapacitor electrode in 6 M KOH, it showed a high specific capacitance of 216 F g and excellent cycling stability with capacitance retention remaining 93.7% after 5000 cycles. Moreover, the AC-5 sample acquired a supramaximal specific capacitance of 609 F g, and the high energy density of AC-5//AC-5 symmetrical cells reached up to 9.2 Wh kg when -phenylenediamine serving as a redox electrolyte was added into KOH electrolyte. The reported simple fabrication strategy would leverage a green biomass precursor for the preparation of supercapacitors.
通过预碳化和氢氧化钾（KOH）活化，以魔芋粉为原料制备了低成本且环保的多孔生物炭。由预碳化碳与氢氧化钾（KOH）质量比为1:5得到的生物炭AC-5具有1403 m²/g的超高比表面积以及存在从微孔到宏孔的分级多孔结构。当AC-5在6 M KOH中用作超级电容器电极时，它表现出216 F/g的高比电容和优异的循环稳定性，在5000次循环后电容保持率为93.7%。此外，AC-5样品获得了609 F/g的超最大比电容，当在KOH电解液中添加对苯二胺作为氧化还原电解质时，AC-5//AC-5对称电池的高能量密度达到9.2 Wh/kg。所报道的简单制备策略将利用绿色生物质前驱体来制备超级电容器。
