Nitrogen-doped activated carbon derived from prawn shells for high-performance supercapacitors
Nitrogen-doped activated carbon derived from prawn shells for high-performance supercapacitors
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DOI：
10.1016/j.electacta.2016.01.005
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发表时间：
2016-02-01
影响因子：
6.6
通讯作者：
Qiu, Jieshan
中科院分区：
文献类型：
--
作者：
Gao, Feng;Qu, Jiangying;Qiu, Jieshan
以对虾壳为原料，采用高温炭化和KOH活化相结合的方法制备了掺氮活性炭。具有高含量氮杂原子的足够孔隙率使得它们对于超级电容器中的电荷存储非常有吸引力。具体地，在700 ° C下获得的活性炭凭借电子双层电容和赝电容的优化组合在酸性和碱性电解质中均显示出优异的电容性能。在50 mA g（1）的电流密度下，它在1 M H2SO 4中表现出695 F g（1）的高比电容，在6 M KOH中表现出357 F g（1）的高比电容。即使在5 A g（1）的高电流密度下循环，超过280 F g-1的高电容仍然可以保留在两种电解质中。在这两种情况下，在1A g（1）下也实现了长达5000次循环的稳定电容保持率超过95%。(C)2016爱思唯尔有限公司版权所有
Nitrogen doped activated carbons have been fabricated by simultaneous carbonization and KOH activation of chitosan biomass regenerated from prawn shell at high temperature. Sufficient porosity with high content of nitrogen heteroatom makes them very appealing for charge storage in supercapacitors. Specifically, the activated carbon obtained at 700 degrees C shows excellent capacitive performance in both acidic and alkaline electrolyte in virtue of the optimized combination of electronic double-layer capacitance and pseudo-capacitance. It exhibits high specific capacitance of 695 F g (1) in 1 M H2SO4 and 357 F g (1) in 6 M KOH at a current density of 50 mA g (1). Even cycled at high current density of 5 A g (1), high capacitance of over 280 F g 1 can be still retained in both electrolytes. Stable capacitance retention over 95% for as long as 5000 cycles is also achieved at 1 A g (1) in both cases. (C) 2016 Elsevier Ltd. All rights reserved.