Towards high areal capacitance, rate capability, and tailorable supercapacitors: Co3O4@polypyrrole core-shell nanorod bundle array electrodes

Longtao Ma, Huiqing Fan, Xinying Wei, Shengmei Chen, Qingzhao Hu, Yan Liu, Chunyi Zhi, Wei Lu, Juan Antonio Zapien, Haitao Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

51 Citations (Scopus)

Abstract

Flexible supercapacitors with high areal capacitance are a promising approach for wearable energy-storage technology due to the limitation of the surface area of the human body (about 2 m2). Meanwhile, a tolerance to deformation and mechanic damage is critical for wearable applications. However, it is still a challenge to achieve supercapacitors with outstanding electrochemical performance and wearability, simultaneously. To solve this problem, we report high-performance, flexible, and tailorable solid-state supercapacitors enabled by Co3O4@PPy nanorod bundle arrays immobilized on carbon fiber cloth (CFC). Furthermore, a solid-state asymmetric supercapacitor was assembled using a freestanding Co3O4@PPy electrode, a freestanding porous carbon electrode, and PVA gel electrolyte. Benefiting from a 3D structure and the synergetic contribution of the Co3O4 nanorods and electrically conductive PPy layer, the Co3O4@PPy electrode and our developed supercapacitor exhibit a high areal capacitance of 6.67 F cm-2 at a current density of 2 mA cm-2, and 2.47 F cm-2 at 4 mA cm-2, respectively, as well as excellent rate capability. More importantly, the solid-state supercapacitor can be tailored into several units and various shapes. Each unit retains its original electrochemical performance. This work provides a new route to wearable energy-storage technology.

Original languageEnglish
Pages (from-to)19058-19065
Number of pages8
JournalJournal of Materials Chemistry A
Volume6
Issue number39
DOIs
Publication statusPublished - 21 Oct 2018

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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