Nanoporous carbons derived from poplar catkins for high performance supercapacitors with a redox active electrolyte of p-phenylenediamine
Nanoporous carbons derived from poplar catkins for high performance supercapacitors with a redox active electrolyte of p-phenylenediamine
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DOI：
10.1016/j.jallcom.2018.03.073
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发表时间：
2018-06
影响因子：
6.2
通讯作者：
Li‐li Liu;Ruirui Feng;Yue Pan;Xiangping Zheng;Lizhong Bai
中科院分区：
文献类型：
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作者：
Li‐li Liu;Ruirui Feng;Yue Pan;Xiangping Zheng;Lizhong Bai
以白杨絮为碳源，采用炭化和KOH活化的方法制备了纳米多孔炭。在800 °C下KOH活化的NPC（NPC 800）表现出包含大孔框架和微孔纹理的分级多孔结构，具有1251.5 m2 g − 1的高比表面积和高达0.85 cm 3 g −1的大孔体积。此外，通过在KOH电解液中引入氧化还原介体（对苯二胺，PPD），使用新型氧化还原活性电解液来改善基于NPC的超级电容器的电化学性能。NPC 800具有0.1 A g−1时557 F g-1的高比电容、10 A g− 1时254 F g-1的良好倍率性能以及出色的循环稳定性，在1 A g−1下循环500次后，电容保持率为77.4%。废弃生物质PC具有良好的电容性能，有望成为高性能、低成本超级电容器的新型碳质材料来源。
Nanoporous carbons (NPCs) have been successfully prepared from poplar catkins (PCs) as a sustainable and renewable carbon source by a facile carbonization and subsequent KOH activation procedure. The KOH-activated NPCs at 800 °C (NPC800) exhibits a hierarchical porous structure containing macroporous frameworks and microporous textures, with a high specific surface area of 1251.5 m2g−1and a large pore volume up to 0.85 cm3g−1. In addition, a novel redox-active electrolyte through introducing a redox-mediator (p-phenylenediamine, PPD) into KOH electrolytes was used to improve the electrochemical performance of the NPCs-based supercapacitors. The NPC800 exhibits a high specific capacitance of 557 F g-1at 0.1 A g−1, a good rate capability of 254 F g-1at 10 A g−1and excellent cycle stability with 77.4% capacitance retention after 500 cycles at 1 A g−1. With a favorable capacitive performance, the waste biomass PCs could be a new source of carbonaceous materials for high performance and low-cost supercapacitors.