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Synthesis of Multiwall Carbon Nanotube/Graphene Composite by an Aerosol Process and its Characterization for Supercapacitors

Category: Aerosol Physics and Instrumentation

Accepted Manuscripts
DOI: 10.4209/aaqr.2018.10.0371
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Eun Hee Jo1,2, Sun Kyung Kim1, Hankwon Chang1,2, Chongmin Lee1, Su-Ryeon Park1, Ji-Hyuk Choi2, Hee Dong Jang 1,2

  • 1 Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources, Yuseong-gu, Daejeon 34132, Korea
  • 2 Department of Nanomaterials Science and Engineering, University of Science and Technology, Yuseong-gu, Daejeon 34113, Korea

Highlights

MWNT/GR composite was fabricated by aerosol spray drying.
The composites showed a crumpled paper ball like morphology.
The composite electrode showed excellent capacitance and rate of capacity retention.


Abstract

A multiwall carbon nanotube/graphene (MWCNT/GR) composite was synthesized for an enhanced supercapacitor. Aerosol spray drying (ASD) was used to synthesize the MWCNT/GR particles using a mixture of graphene oxide (GO) solution and MWCNT. The effect of the ratio of the MWCNT/GO on the composite properties, including the shape and layered structure, was investigated. The MWCNT/GR composites with a morphology were generally a crumpled paper ball in shape, and the average diameter of MWCNT/GR particle was approximately 5 μm. MWCNTs were uniformly dispersed in graphene sheets and the MWCNTs not only increased the basal spacing but also bridged the widely spaced layers for better electron transfer between graphene sheets. Thus, the MWCNTs increased the contact area of electrolyte/electrode and facilitated ion transportation of electrons and electrolyte in the electrode. Electrochemical results demonstrate that the MWCNT/GR (weight ratio = 0.1) electrode has a capacitance of 192 F g-1 and excellent rate of capacity retention (88% at 4 A g-1), using a two-electrode testing system.

Keywords

Supercapacitor MWCNT/GR Aerosol spray drying


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