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首页> 外文期刊>RSC Advances >Nitrogen-doped hierarchical porous carbon derived from a chitosan/polyethylene glycol blend for high performance supercapacitors
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Nitrogen-doped hierarchical porous carbon derived from a chitosan/polyethylene glycol blend for high performance supercapacitors

机译：源自壳聚糖/聚乙二醇共混物的氮掺杂分级多孔碳，用于高性能超级电容器

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Nitrogen-doped hierarchical porous carbon (NHPC) materials were synthesized by using a chitosan/polyethylene glycol (PEG) blend as raw material through a facile carbonization–activation process. In this method, chitosan was used as a nitrogen-containing carbon precursor, low cost and large-scale commercial PEG was employed as a porogen. The physical and electrochemical properties of the resultant NHPC were affected by the ratio of chitosan and PEG. The sample obtained by the ratio of 3?:?2 exhibits a high specific surface area (2269 m ~(2) g ~(?1) ), moderate nitrogen doping (3.22 at%) and optimized pore structure. It exhibits a high specific capacitance of 356 F g ~(?1) in 1 M H _(2) SO _(4) and 271 F g ~(?1) in 2 M KOH at a current density of 1 A g ~(?1) , and over 230 F g ~(?1) can be still retained at a high current density of 20 A g ~(?1) in both electrolytes. Additionally, the assembled symmetric supercapacitors show an excellent cycling stability with 94% (in 1 M H _(2) SO _(4) ) and 97% (in 2 M KOH) retention after 10?000 cycles at 1 A g ~(?1) . These results indicate that the chitosan/PEG blend can act as a novel and appropriate precursor to prepare low-cost NHPC materials for high-performance supercapacitors.
机译：以壳聚糖/聚乙二醇（PEG）共混物为原料，通过简便的碳化活化过程合成了氮掺杂的分级多孔碳（NHPC）材料。在该方法中，壳聚糖用作含氮碳前体，低成本且大规模商业PEG用作致孔剂。壳聚糖和PEG的比例影响所得NHPC的物理和电化学性能。以3∶∶2的比例获得的样品显示出高的比表面积（2269m·（2）g·（Δ1）），适度的氮掺杂（3.22at％）和优化的孔结构。在1 A g〜（）的电流密度下，它在1 MH _（2）SO _（4）中具有356 F g〜（？1）的高比电容，在2 M KOH中具有271 F g〜（？1）的高比电容。在两种电解质中，仍可以在20 A g〜（？1）的高电流密度下保持230 F g〜（？1）以上的电流。此外，组装的对称超级电容器在1 A g〜（？）循环10？000次后表现出出色的循环稳定性，保持率达94％（在1 MH _（2）SO _（4）中）和97％（在2 M KOH中）。 1）。这些结果表明，壳聚糖/ PEG共混物可作为新型且合适的前体，以制备用于高性能超级电容器的低成本NHPC材料。

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