In-situ fabricating MnO2 and its derived FeOOH nanostructures on mesoporous carbon towards high-performance asymmetric supercapacitor

Yuxiang Chen, Chuan Jing, Xin Fu, Man Shen, Tong Cao, Wangchen Huo, Xiaoying Liu, Hong Chang Yao, Yuxin Zhang, Kexin Yao

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Asymmetric supercapacitors with high energy density have received increasing attention in the past decade in order to meet the requirements of practical applications. The mesoporous carbon (SBA-C) with ordered parallel channels prepared using mesoporous silica as a hard template was wrapped with the ultrathin MnO2 nanosheets to construct a 3D hierarchical porous structure through a self-limiting reaction and the FeOOH nanoneedles were successfully derived by template-engaged redox etching using in-situ fabricating MnO2 nanosheet templates. The interesting hierarchical porous construction presents fast transfer paths of ions and electrons, good electrical conductivity, and high specific surface area. The as-fabricated nanohybrids exhibit high specific capacitance (219.7 F g−1 at 1 A g−1 of MnO2@SBA-C and 240.6 F g−1 at 2 A g−1 of FeOOH@SBA-C), good rate performance, and outstanding cycling stability. An asymmetric supercapacitor is assembled by using MnO2@SBA-C and FeOOH@SBA-C as the negative and positive electrode, which delivers a high energy density of 39.4 and 14.2 Wh kg−1 at a power density of 500 and 8000 W kg−1, respectively. The above satisfactory performance exhibits that in-situ fabricating MnO2 nanosheets and its derived FeOOH nanoneedles on mesoporous carbon present great potential to meet the energy/power characteristics of asymmetric supercapacitor in practical applications.
Original languageEnglish (US)
Pages (from-to)144123
JournalApplied Surface Science
Volume503
DOIs
StatePublished - Oct 18 2019

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