Synthesis of porous carbon spheres derived from lignin through a facile method for high performance supercapacitors
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第11期
论文作者：Yuemei Chen Guoxiong Zhang Jingyuan Zhang Haibo Guo Xin Feng Yigang Chen
文章页码：2189 - 2196
摘 要：Porous carbon spheres（PCS） derived from lignin have been prepared through a facile method and fabricated as electrodes for electric double-layer capacitors. Spherical shaped mixtures of lignosulfonate and crystalized KOH are formed by spray drying of a solution of lignosulfonate and KOH. Activation by KOH is performed at high temperatures along with lignosulfonate carbonization. With an appropriate pore structure, the obtained PCS have a specific surface area of 1372.87 m2 g-1 and show a capacitance of 340 F g-1 in 3 M KOH at a current density of 0.5 A g-1. Moreover, a symmetric supercapacitor fabricated using the PCS as electrodes show a maximum capacitance of 68.5 F g-1, and an energy density of 9.7 W h kg-1 at a power density of 250 W kg-1. The capacity retention is more than 94.5% after 5000 galvanostatic chargedischarge cycles. The excellent characteristics seem to be ascribed to the pore structures of PCS that have a large specific surface area and a low electrical resistance.
Yuemei Chen1，Guoxiong Zhang1，Jingyuan Zhang1，Haibo Guo1，Xin Feng2，Yigang Chen1
1. Department of Electronic Information Materials,School of Materials Science and Engineering,Shanghai University2. Nano-Science & Technology Research Center,Shanghai University
摘 要：Porous carbon spheres（PCS） derived from lignin have been prepared through a facile method and fabricated as electrodes for electric double-layer capacitors. Spherical shaped mixtures of lignosulfonate and crystalized KOH are formed by spray drying of a solution of lignosulfonate and KOH. Activation by KOH is performed at high temperatures along with lignosulfonate carbonization. With an appropriate pore structure, the obtained PCS have a specific surface area of 1372.87 m2 g-1 and show a capacitance of 340 F g-1 in 3 M KOH at a current density of 0.5 A g-1. Moreover, a symmetric supercapacitor fabricated using the PCS as electrodes show a maximum capacitance of 68.5 F g-1, and an energy density of 9.7 W h kg-1 at a power density of 250 W kg-1. The capacity retention is more than 94.5% after 5000 galvanostatic chargedischarge cycles. The excellent characteristics seem to be ascribed to the pore structures of PCS that have a large specific surface area and a low electrical resistance.
关键词：
