Humic acids-based hierarchical porous carbons as high-rate performance electrodes for symmetric supercapacitors.
Humic acids-based hierarchical porous carbons as high-rate performance electrodes for symmetric supercapacitors.
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DOI：
10.1016/j.biortech.2014.04.095
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发表时间：
2014-07
影响因子：
11.4
通讯作者：
Zhi Qiao;Mingming Chen;Cheng-yang Wang;Yun-cai Yuan
中科院分区：
文献类型：
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作者：
Zhi Qiao;Mingming Chen;Cheng-yang Wang;Yun-cai Yuan
以轻质腐植酸和生物技术腐植酸为原料，采用氢氧化钾活化法合成了两种比表面积为2000m2g−1的多孔炭。腐植酸的含氧基团含量较高，能够溶于KOH水溶液，有利于KOH的均相活化。LHA基高性能混凝土由丰富的微孔、中孔和大孔组成，在6M KOH中，100A−1下的比容为178F g−1，在0.05A~100A g−1范围内的容量保持率为%。相比之下，基于BHA的高性能复合材料的电容保持率较低，为54%，在100A−1时的比电容为157F/−，这是由于BHA-HPC中存在过多的微孔所致。此外，LHA-HPC的产量高于BHA-HPC(51vs.17wt%)。
Two kinds of hierarchical porous carbons (HPCs) with specific surface areas of 2000 m2g−1were synthesized using leonardite humic acids (LHA) or biotechnology humic acids (BHA) precursors via a KOH activation process. Humic acids have a high content of oxygen-containing groups which enabled them to dissolve in aqueous KOH and facilitated the homogeneous KOH activation. The LHA-based HPC is made up of abundant micro-, meso-, and macropores and in 6 M KOH it has a specific capacitance of 178 F g−1at 100 A g−1and its capacitance retention on going from 0.05 to 100 A g−1is 64%. In contrast, the BHA-based HPC exhibits a lower capacitance retention of 54% and a specific capacitance of 157 F g−1at 100 A g−1which is due to the excessive micropores in the BHA-HPC. Moreover, LHA-HPC is produced in a higher yield than BHA-HPC (51 vs. 17 wt%).