Interfacial Approach toward Benzene‐Bridged Polypyrrole Film–Based Micro‐Supercapacitors with Ultrahigh Volumetric Power Density

• Published in: Advanced functional materials 2020-02, Vol.30 (7), p.n/a
• Main Authors: Jiang, Kaiyue, Baburin, Igor A., Han, Peng, Yang, Chongqing, Fu, Xiaobin, Yao, Yefeng, Li, Jiantong, Cánovas, Enrique, Seifert, Gotthard, Chen, Jiesheng, Bonn, Mischa, Feng, Xinliang, Zhuang, Xiaodong
• Format: Article
• Language: English
• Subjects: Benzene; benzene‐bridged polypyrrole; Carrier mobility; Hydrocarbons; interface; laser; Materials science; micro‐supercapacitor; Nanomaterials; Organic chemistry; Polypyrroles; semiconductive film; Supercapacitors; Two dimensional materials
• ISSN: 1616-301X; 1616-3028; 1616-3028
• DOI: 10.1002/adfm.201908243

2D soft nanomaterials are an emerging research field due to their versatile chemical structures, easily tunable properties, and broad application potential. In this study, a benzene‐bridged polypyrrole film with a large area, up to a few square centimeters, is synthesized through an interfacial polymerization approach. As‐prepared semiconductive films exhibit a bandgap of ≈2 eV and a carrier mobility of ≈1.5 cm2 V−1 s−1, inferred from time‐resolved terahertz spectroscopy. The samples are employed to fabricate in‐plane micro‐supercapacitors (MSCs) by laser scribing and exhibit an ultrahigh areal capacitance of 0.95 mF cm−2, using 1‐ethyl‐3‐methylimidazolium tetrafluoroborate ([EMIM][BF4]) as an electrolyte. Importantly, the maximum energy and power densities of the developed MSCs reach values up to 50.7 mWh cm−3 and 9.6 kW cm−3, respectively; the performance surpassing most of the 2D material‐based MSCs is reported to date. Benzene‐bridged polypyrrole films with controlable thickness and ultralarge area are prepared by a conventional interfacial polymerization method. Such a semiconductive polypyrrole film, which possesses a bandgap of 2.0 eV and a carrier mobility of ≈1.5 cm2 V−1 s−1, can be used as electrode material for micro‐supercapacitors and exhibits ultrahigh energy (50.7 mWh cm−3) and power (9.6 kW cm−3) densities.