Mass Transport Behaviors in Graphene and Polyaniline Heterostructure–Based Microsupercapacitors

• Published in: Advanced energy and sustainability research 2021-05, Vol.2 (5), p.n/a
• Main Authors: Chen, Cheng, Huang, Jiaqian, Mishukova, Viktoriia, Jiang, Kaiyue, Ye, Xuanzi, Lu, Chenbao, Chen, Zhenying, Ke, Changchun, Su, Yuezeng, Li, Jiantong, Zhuang, Xiaodong
• Format: Article
• Language: English
• Subjects: Anions; Capacitance; Carbon; Composite materials; Direct laser writing; Electrochemistry; Electrodes; Electrolytes; Energy; Energy storage; Fabrication; Fourier transforms; Glass substrates; Graphene; Heterostructures; laser scribing; Mass transport; Material properties; microsupercapacitors; Polyanilines; Polyethylene terephthalate; Polyvinyl alcohol; Protonation; Quartz crystal microbalance; Quartz crystals; Scanning electron microscopy; Sensors; Spectrum analysis; Substrates
• ISSN: 2699-9412; 2699-9412
• DOI: 10.1002/aesr.202100006

The development of miniaturized energy storage components with high areal performance for emerging electronics depends on scalable fabrication techniques for thick electrodes and an in‐depth understanding of the intrinsic properties of materials. Based on the coprecipitation behavior of electrically exfoliated graphene and reduced graphene oxide–templated polyaniline (PANi) nanoflake, this work develops a simple, green, low‐cost, and scalable drop‐casted technique to easily fabricate uniform thick electrodes (up to 80 μm) on various substrates. Through using a direct laser writing process, planar microsupercapacitors can be readily attained. As‐fabricated flexible all‐solid‐state microsupercapacitors exhibit an ultrahigh areal capacitance of 172 mF cm−2 at 0.1 A cm−2 and excellent cycling stability of 91% capacitance retention over 2000 cycles at a high current density of 1.0 A cm−2. Furthermore, based on the electrochemical quartz crystal microbalance research result, the pseudocapacitance contribution is mostly provided by the adsorption/desorption of SO42− anions during the protonation process of PANi. This work offers a simple strategy toward superior‐performance micro‐sized energy devices and a new perspective to understand the origin of the capacitance of composites and heterostructures. Graphene and polyaniline heterostructure based on‐chip microsupercapacitor is prepared by direct dip coating and laser scribing. As‐prepared microsupercapacitors exhibit ultra‐high areal capacitance of up to 172 mF cm−2. The mass transport behaviors among the heterostructure are studied to address the high performance and offers a new way to understand the charge‐storage mechanism of heterostructure‐based electrodes.