3D Hierarchical Porous Carbon for Supercapacitors Prepared from Lignin through a Facile Template-Free Method
3D Hierarchical Porous Carbon for Supercapacitors Prepared from Lignin through a Facile Template-Free Method
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通过简单的无模板方法从木质素制备超级电容器用 3D 分级多孔碳
DOI：
10.1002/cssc.201403486
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发表时间：
2015-06-22
期刊：
影响因子：
8.4
通讯作者：
Zhao, Mingzhu
中科院分区：
文献类型：
--
作者：
Zhang, Wenli;Lin, Haibo;Zhao, Mingzhu
通过一种简便的无模板法制备了木质素衍生的层状多孔炭(LHPC)。木质素-氢氧化钾溶液的固化导致氢氧化钾在木质素中结晶。固体木质素中结晶的KOH颗粒在热处理过程中既起到模板作用，又起到活化剂的作用。所得到的LHPC由大孔核心、介孔孔道和微孔组成，呈现三维网络。LHPC由12.27at%的含氧基团组成，这导致了假电容。在0.05Ag(-1)下，LHPC在1M H_2SO_4中的比容量为165.0Fg(-1)，即使在10Ag(-1)时比容量仍为123.5Fg(-1)。LHPC还表现出良好的循环稳定性，5000次恒流充放电循环后容量保持率为97.3%。由于LHPC制备工艺简单，为制备电化学储能器件用多孔炭提供了一种简便的替代方法。
Lignin-derived hierarchical porous carbon (LHPC) was prepared through a facile template-free method. Solidification of the lignin-KOH solution resulted in KOH crystalizing within lignin. The crystalized KOH particles in solid lignin acted both as template and activating agent in the heat-treatment process. The obtained LHPC, exhibiting a 3D network, consisted of macroporous cores, mesoporous channels, and micropores. The LHPC comprised 12.27at% oxygen-containing groups, which resulted in pseudocapacitance. The LHPC displayed a capacitance of 165.0Fg(-1) in 1M H2SO4 at 0.05Ag(-1), and the capacitance was still 123.5Fg(-1) even at 10Ag(-1). The LHPC also displayed excellent cycling stability with capacitance retention of 97.3% after 5000 galvanostatic charge-discharge cycles. On account of the facile preparation of LHPC, this paper offers a facile alternative method for the preparation of hierarchical porous carbon for electrochemical energy storage devices.