Self-nitrogen-doped porous biochar derived from kapok (Ceiba insignis) fibers： Effect of pyrolysis temperature and high electrochemical performance  

作　　者：Jun-Rui Wang Feng Wan Qiu-Feng Lu Fei Chen Qilang Lin 

机构地区：[1]College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China [2]Key Laboratory of Eco-materials Advanced Technology (Fuzhou University), Fujian Province University, Fuzhou 350116, China

出　　处：《Journal of Materials Science & Technology》2018年第10期1959-1968,共10页材料科学技术（英文版）

基　　金：supported financially by the Natural Science Foundation of Fujian Province,China(No.2016J01729);the Key Program of Youth Natural Science Foundation of Fujian Province University,China(No.JZ160413)

摘　　要：Self-nitrogen-doped porous biochar derived from kapok fibers possesses unique structure and excel- lent electrochemical performance. In this study, one-step pyrolysis method was introduced to prepare porous biochar from kapok fibers, and effect of pyrolysis temperature on structure and electrochemical performance of the porous biochar was investigated. It was found that pyrolysis temperature played an important role in determining microstructure of the biochar. At the pyrolysis temperature of 750 ℃, the as-prepared biochar （CKF-750） represented a largest specific surface area of 1125.7 m^2 g^-1 and pore vol- ume of 0.7130 m^3 g^-1, and hence brings CKF-750 a highest specific capacitance of 283 F g^-1 at a current density of I A g^-1 in a 6 mol L^-1 KOH electrolyte. Furthermore, the cycle stability of CKF-750 was wonderful, and the specific capacitance retained almost constant after 10000 cycles. Therefore, the pyrolysis tem- perature of 750 ℃ is optimal for the preparation of porous hiochar as an outstanding electrode material for supercapacitor.Self-nitrogen-doped porous biochar derived from kapok fibers possesses unique structure and excel- lent electrochemical performance. In this study, one-step pyrolysis method was introduced to prepare porous biochar from kapok fibers, and effect of pyrolysis temperature on structure and electrochemical performance of the porous biochar was investigated. It was found that pyrolysis temperature played an important role in determining microstructure of the biochar. At the pyrolysis temperature of 750 ℃, the as-prepared biochar （CKF-750） represented a largest specific surface area of 1125.7 m^2 g^-1 and pore vol- ume of 0.7130 m^3 g^-1, and hence brings CKF-750 a highest specific capacitance of 283 F g^-1 at a current density of I A g^-1 in a 6 mol L^-1 KOH electrolyte. Furthermore, the cycle stability of CKF-750 was wonderful, and the specific capacitance retained almost constant after 10000 cycles. Therefore, the pyrolysis tem- perature of 750 ℃ is optimal for the preparation of porous hiochar as an outstanding electrode material for supercapacitor.

关 键 词：Kapok fiber Porous biochar Self-nitrogen-doped One-step pyrolysis Electrochemical performance 

分 类 号：TQ127.11[化学工程—无机化工] TB383.4[一般工业技术—材料科学与工程]