Formation of High Surface Area Hierarchical Porous Carbon Via a Novel Two Step Activation Process for Fast Supercapacitors
Formation of High Surface Area Hierarchical Porous Carbon Via a Novel Two Step Activation Process for Fast Supercapacitors
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通过快速超级电容器的新型两步激活工艺形成高表面积分级多孔碳
DOI：
10.1002/slct.202000006
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发表时间：
2020
期刊：
影响因子：
2.1
通讯作者：
Zhang Jingbo
中科院分区：
文献类型：
--
作者：
Li Guangli;Wei Xing;Li Yingying;Mao Wenfeng;Du Guixiang;Zhang Jingbo
制备具有分级结构、高比表面积和大孔容的分级多孔炭材料仍然是一个全球性的挑战。本文提出了一种新的样品两步活化法，即在第一步引入Ca（OH）2形成介孔-大孔结构，在第二步引入KOH形成微孔，以单宁提取物为处理剂合成分级多孔炭。得益于这种方法，合成的HPC具有1996.9 cm 2g −1的比表面积，1.09 cm 3g −1的孔体积，以及具有微-中-大孔的分级多孔结构。 制备的HPC具有发达的中孔和微孔，可以提供理想的离子扩散通道，具有低迁移阻力，使超级电容器具有优异的功率密度和循环稳定性，并且其在5 A g− 1下的比电容为248 F g − 1，在20A g−1下保持在228 F g−1。 单宁提取物廉价易得、环境友好，结合其优异的电化学性能和成熟的两步法，为高性能超级电容器用HPC的制备提供了新的思路。
Produce of hierarchical porous carbon (HPC) materials that process hierarchical structure, high specific surface area and large pore volume is still a global challenge. Here we develop a novel sample two‐step activation method, which introduces Ca(OH)2at the first step to produce the meso‐macro porous structure and KOH at the second step to create micropores, to synthesize hierarchical porous carbon using tannin extract as processor. Benefited from this method, the synthesized HPC exhibits the specific surface area of 1996.9 cm2g−1, pore volume of 1.09 cm3g−1, and hierarchical porous structure with micro‐meso‐macro pores. The prepared HPC with well‐developed mesopores and micropores can provides ideal channels for ion diffusion with low migration resistances, enabling an excellent power density and cycling stability for supercapacitors, and it exhibits the specific capacitance of 248 F g−1at 5 A g−1and maintained at 228 F g−1at 20 A g−1. Tannin extract is cheap, easy to obtain and environmentally friendly, combined with the excellent electrochemical performances and the well‐developed two‐step method, provides a new idea for the preparation of HPC for high performance supercapacitor.