High Electroactive Material Loading on a Carbon Nanotube@3D Graphene Aerogel for High-Performance Flexible All-Solid-State Asymmetric Supercapacitors

Zhenghui Pan, Meinan Liu, Jie Yang, Yongcai Qiu, Wanfei Li, Yan Xu, Xinyi Zhang, Yuegang Zhang

Research output: Contribution to journalArticleResearchpeer-review

114 Citations (Scopus)

Abstract

Freestanding carbon-based hybrids, specifically carbon nanotube@3D graphene (CNTs@3DG) hybrid, are of great interest in electrochemical energy storage. However, the large holes (about 400 µm) in the commonly used 3D graphene foams (3DGF) constitute as high as 90% of the electrode volume, resulting in a very low loading of electroactive materials that is electrically connected to the carbon, which makes it difficult for flexible supercapacitors to achieve high gravimetric and volumetric energy density. Here, a hierarchically porous carbon hybrid is fabricated by growing 1D CNTs on 3D graphene aerogel (CNTs@3DGA) using a facile one-step chemical vapor deposition process. In this architecture, the 3DGA with ample interconnected micrometer-sized pores (about 5 µm) dramatically enhances mass loading of electroactive materials comparing with 3DGF. An optimized all-solid-state asymmetric supercapacitor (AASC) based on MnO2@CNTs@3DGA and Ppy@CNTs@3DGA electrodes exhibits high volumetric energy density of 3.85 mW h cm−3 and superior long-term cycle stability with 84.6% retention after 20 000 cycles, which are among the best reported for AASCs with both electrodes made of pseudocapacitive electroactive materials.

Original languageEnglish
Article number1701122
JournalAdvanced Functional Materials
Volume27
Issue number27
DOIs
Publication statusPublished - 19 Jul 2017
Externally publishedYes

Keywords

  • all-solid-state asymmetric supercapacitors
  • carbon nanotube@3D graphene aerogels
  • electroactive materials
  • flexible electronic devices

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