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首页> 外文期刊>RSC Advances >Fabrication of N-doped and shape-controlled porous monolithic carbons from polyacrylonitrile for supercapacitors
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Fabrication of N-doped and shape-controlled porous monolithic carbons from polyacrylonitrile for supercapacitors

机译：由聚丙烯腈制备用于超级电容器的N掺杂和形状可控的多孔整体碳

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摘要

N-doped porous monolithic carbons (PMC) have been developed from polyacrylonitrile (PAN) via a template-free thermally induced phase separation (TIPS) approach followed by an easy pyrolysis process. Three-dimensional (3D) PAN monolith (PM) was firstly fabricated as the starting material. The shape of the 3D PM was designed during the phase separation step, revealing that the product carbons had the potential advantages of desired porosity and controllable shape. Two typical activation methods were employed and compared to prepare PMC. KOH-activated PMC showed a larger surface area of 1600 m2 g?1 and higher nitrogen content of 5.6% in comparison to that being activated in a carbon dioxide atmosphere (CD-PMC). The electrochemical measurements revealed that PMC possessed a high capacitance of 270 F g?1 at 0.2 A g?1 and 195 F g?1 even at 100 A g?1, ultra-high rate capability with 72% capacitance retention from 0.2 to 100 A g?1 and outstanding cycling stability with 100% capacitance retention at 20 A g?1 after 5000 cycles. These results demonstrate that the present facile and efficient synthetic strategy for PMC from PAN can benefit the promotion of its application in energy storage devices and it is highly likely to be extended to other polymer sources.
机译：已通过无模板热诱导相分离（TIPS）方法从聚丙烯腈（PAN）中开发了N掺杂的多孔整体碳（PMC），随后进行了简单的热解过程。首先制造了三维（3D）PAN整料（PM）作为起始材料。在相分离步骤中设计了3D PM的形状，显示出产品碳具有所需孔隙率和可控形状的潜在优势。使用两种典型的激活方法进行比较，以制备PMC。 KOH活化的PMC的表面积较大，为1600 m 2 g ？1 ，氮含量较高，为5.6与在二氧化碳气氛（CD-PMC）中被活化的相比，％。电化学测量表明，PMC在0.2 A g ？1 时具有270 F g ？1 的高电容。和195 F g ？1 甚至在100 A g ？1 时也具有72％的超高倍率性能电容保持力从0.2到100 A g ？1 ，并具有出色的循环稳定性，在20 A g ？1 < / small> 5000次循环后。这些结果表明，目前用于PAN的PMC的简便有效的合成策略可以促进其在储能装置中的应用，并且很有可能扩展到其他聚合物来源。

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