Free-standing hybridized electrode consisting of double-walled carbon nanotubes (DWNTs) and activated carbon have been fabricated for flexible supercapacitor applications. The xanthan-gum, used in our methodology, showed high ability in dispersing the strongly bundled DWNTs, and was then effectively converted to activated carbon with large surface area via chemical activation. The homogeneously dispersed DWNTs within xanthan-gum derived activated carbon acted as both electrical path and mechanical support of electrode material. The hybridized film from highly dispersed DWNTs and activated carbon was mechanically strong, has high electrical conductivity, and exhibited high specific capacitance of 141.5 F/g at the current density of 100 mV/s. Our hybridized film is highly promising as electrode material for flexible supercapacitors in wearable device.

    Abstract
    1 Introduction
    2 Experimental
        2.1 Fabrication of hybridized film
        2.2 Optical characterizations
        2.3 Structural characterizations
        2.4 Electrochemical characterization
    3 Results and discussion
    4 Conclusion
    Acknowledgements 
    References

• Cheon‑Soo Kang(Graduate School of Engineering and Water Environment and Civil Engineering, Faculty of Engineering, Shinshu University)
• Yong‑Il Ko(Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST))
• Kazunori Fujisawa(Research Initiative for Supra‑Materials (RISM), Shinshu University)
• Taiki Yokokawa(Graduate School of Engineering and Water Environment and Civil Engineering, Faculty of Engineering, Shinshu University)
• Jin Hee Kim(Optoelectronics Convergence Research Center and School of Chemical Engineering, Faculty of Engineering, Chonnam National University)
• Jong Hun Han(Optoelectronics Convergence Research Center and School of Chemical Engineering, Faculty of Engineering, Chonnam National University)
• Jae‑Hyung Wee(Alan G. MacDiarmid Energy Research Institute, School of Polymer Science and Engineering and Department of Polymer Engineering, Graduate School, Chonnam National University)
• Yoong Ahm Kim(Alan G. MacDiarmid Energy Research Institute, School of Polymer Science and Engineering and Department of Polymer Engineering, Graduate School, Chonnam National University)
• Hiroyuki Muramatsu(Graduate School of Engineering and Water Environment and Civil Engineering, Faculty of Engineering, Shinshu University)
• Takuya Hayashi(Graduate School of Engineering and Water Environment and Civil Engineering, Faculty of Engineering, Shinshu University)