College of Chemistry, Jilin University, Changchun, 130012 (PR China), Fax: (+86) 431-85155189.
Key Laboratory of Physics and Technology for Advanced, Batteries of Ministry of Education, Jilin University, Changchun, 130012 (PR China).
ChemSusChem. 2015 Jun 22;8(12):2114-22. doi: 10.1002/cssc.201403486. Epub 2015 May 27.
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 12.27 at % oxygen-containing groups, which resulted in pseudocapacitance. The LHPC displayed a capacitance of 165.0 F g(-1) in 1 M H2 SO4 at 0.05 A g(-1) , and the capacitance was still 123.5 F g(-1) even at 10 A g(-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.
通过一种简单的无模板方法制备了木质素衍生的分级多孔碳 (LHPC)。木质素-KOH 溶液的凝固导致 KOH 在木质素内结晶。结晶的 KOH 颗粒在固态木质素中既充当模板又充当热处理过程中的活化剂。所得 LHPC 具有 3D 网络，由大孔核、介孔通道和微孔组成。LHPC 包含 12.27 at%的含氧基团，从而产生赝电容。LHPC 在 0.05 A g(-1) 的 1 M H2 SO4 中表现出 165.0 F g(-1) 的电容，即使在 10 A g(-1) 的情况下，电容仍为 123.5 F g(-1)。LHPC 还表现出优异的循环稳定性，经过 5000 次恒流充放电循环后，电容保持率为 97.3%。鉴于 LHPC 的制备简便，本文为电化学储能器件的分级多孔碳的制备提供了一种简便的替代方法。
