文献类型：期刊文献

英文题名：Polypyrrole encapsulation-protected porous multishelled Co3O4 hollow microspheres for advanced all-solid-state asymmetric supercapacitors with boosted reaction kinetics and stability

作者：Zhang, Zhifang[1,2];Su, Xiaorui[2];Zhu, Yanyan[2];Fang, Zebo[3];Luo, Xiaojing[2];Chen, Zhonghui[1]

机构：[1]Henan Univ, Sch Mat Sci & Engn, Lab Special Funct Mat, Minist Educ, Kaifeng 475004, Peoples R China;[2]Shanghai Univ Elect Power, Coll Math & Phys, Shanghai 200090, Peoples R China;[3]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China

年份：2020

卷号：31

期号：25

外文期刊名：NANOTECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000525591000001)、、WOS

基金：We acknowledge the support by the start-up fund of Henan University for funding to Z H C (CX3050A0920134), and the National Natural Science Foundation of China (Grant No. 51672172, 51872186, 11504227).

语种：英文

外文关键词：porous multishelled Co3O4 hollow microspheres; polypyrrole; encapsulation-protected; reaction kinetics; stability

外文摘要：Transition metal oxides (TMOs) have shown great potential in high-performance supercapacitors (SCs) because of their high theoretical capacities, low cost and simple preparation process. However, considerable challenges still remain in simultaneously improving their electrical conductivity, reaction kinetics and stability. Herein, we deliberately designed a polypyrrole encapsulation-protected porous multishelled Co3O4 hollow microspheres (pMS-Co3O4/PPy) composite via a modified carbon self-templating method and in situ oxidative polymerization route. The unique porous multishelled structure of the pMS-Co3O4 hollow microspheres assembled by interconnected Co3O4 nanoparticles can provide sufficient active sites, shorted ion diffusion paths and efficiently alleviate the structural strain. Meanwhile, the PPy encapsulation-protected nanolayers significantly improve their electrical conductivity, contribute pseudocapacitance and protect Co3O4 nanoparticles from structural pulverization-chemical dissolution into electrolyte. The prepared pMS-Co3O4/PPy electrodes exhibited a high specific capacitance (1292.2 F g(-1) at 1 A g(-1)), excellent rate capability (1205.8 F g(-1) at 10 A g(-1)) and cycle stability (ultrahigh capacitance retention of 91.5% for 5000 cycles), which has rarely been achieved in previously reported Co3O4-based electrodes. Furthermore, the assembled all-solid-state asymmetric supercapacitors (pMS-Co3O4/PPy//AC) delivered a high energy density of 40.2 Wh kg(-1) at a power density of 761.7 W kg(-1) and superior stability with a capacitance retention of 90.6% for 5000 cycles. This study offers an effective nanostructure design strategy to solve the issues of TMOs and develop high-performance energy storage systems.