Electropolymerized Poly(3,4-ethylenedioxythiophene)/Screen-Printed Reduced Graphene Oxide-Chitosan Bilayer Electrodes for Flexible Supercapacitors

Chia-Hui Tseng; Hsun-Hao Lin; Cheng-Wei Hung; I-Chung Cheng; Shyh-Chyang Luo; I-Chun Cheng; Jian-Zhang Chen

doi:10.1021/acsomega.1c01601

Electropolymerized Poly(3,4-ethylenedioxythiophene)/Screen-Printed Reduced Graphene Oxide-Chitosan Bilayer Electrodes for Flexible Supercapacitors

ACS Omega. 2021 Jun 21;6(25):16455-16464. doi: 10.1021/acsomega.1c01601. eCollection 2021 Jun 29.

Authors

Chia-Hui Tseng^{1

2}, Hsun-Hao Lin³, Cheng-Wei Hung⁴, I-Chung Cheng⁴, Shyh-Chyang Luo^{3

2}, I-Chun Cheng⁵, Jian-Zhang Chen^{1

2}

Affiliations

¹ Graduate Institute of Applied Mechanics, National Taiwan University, Taipei City 106319, Taiwan.
² Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei City 106319, Taiwan.
³ Department of Materials Science and Engineering, National Taiwan University, Taipei City 106319, Taiwan.
⁴ Department of Mechanical Engineering, National Taiwan University, Taipei City 106319, Taiwan.
⁵ Graduate Institute of Photonics and Optoelectronics & Department of Electrical Engineering, National Taiwan University, Taipei City 106319, Taiwan.

Abstract

An electropolymerized poly(3,4-ethylenedioxythiophene) (PEDOT)/screen-printed reduced graphene oxide (rGO)-chitosan (CS) bilayer material was coated on carbon cloth to form electrodes for gel-electrolyte flexible supercapacitors. The conductive polymer and carbon-based materials mainly contribute pseudocapacitance (PC) and electrical double-layer capacitance (EDLC), respectively. The high porosity and hydrophilicity of the PEDOT/rGO-CS bilayer material offers a large contact area and improves the contact quality for the gel electrolyte, thereby enhancing the capacitive performance. Cyclic voltammetry (CV) under a potential scan rate of 2 mV/s revealed that a maximum areal capacitance of 1073.67 mF/cm² was achieved. The capacitance contribution ratio PC/EDLC was evaluated to be ∼67/33 by the Trasatti method. A 10,000-cycle CV test showed a capacitance retention rate of 99.3% under a potential scan rate of 200 mV/s, indicating good stability. The areal capacitance remains similar under bending with a bending curvature of up to 1.5 cm^-1.