Conducting α-Fe2O3 nanorod/polyaniline/CNT gel framework for high performance anodes towards supercapacitors

• Published in: Composites science and technology Vol. 156; pp. 231 - 237
• Main Authors: Yang, Zhaokun, Qiu, Aidong, Ma, Jun, Chen, Mingqing
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2018
• Subjects: Anode; Conducting framework; High mass loading; Hydrogel; α-Fe2O3; α-Fe2O3; Hydrogel; Anode; High mass loading; Conducting framework
• ISSN: 0266-3538; 1879-1050
• DOI: 10.1016/j.compscitech.2018.01.012

Thick-electrode design toward high energy density per device is of particular importance for supercapacitors to store large amount of energy, but this remains a seemingly insurmountable challenge due to sluggish electron transport. The challenge is addressed herein by developing an electrically and ionically conducting framework which consists of α-Fe2O3 nanorods, multi-walled carbon nanotubes (CNTs) and polyaniline (PANi) hydrogel. The interconnecting composite framework is formed by in situ polymerizing aniline on the surface of α-Fe2O3 nanorods and CNTs; the nanorods are found to well disperse in the matrix. The framework can provide low-resistance, continuous transport pathways for both electrons and electrolyte ions in the entire electrode system, maximizing the energy use of the nanorods. An anode of ∼100 μm in thickness is fabricated using the composite framework, corresponding to a mass loading of 9.3 mg cm−2. It delivers high area capacitance of 2434.7 mF cm−2 and cycling capacitance retention of 96.3% after 10,000 cycles. This work would shed light on the design of thick electrodes toward high-capacity energy storage devices.