Preparation of sandwich-like ternary hierarchical nanosheets manganese dioxide/polyaniline/reduced graphene oxide as electrode material for supercapacitor

Qianhui Wu, Ming Chen*, Shishuang Wang, Xiue Zhang, Long Huan, Guowang Diao*

College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu Province, 225002, People’s Republic of China

Abstract:In this paper, a new class ofsandwich-liketernary hierarchical nanosheetsis fabricated by a facile, reproducible, and scalable two-step strategy.Conducting polymer polyaniline (PANI) is coated onreduced graphene oxide(RGO) to form PANI/RGOhybridnanosheets. Then, nanoflaky manganese dioxide (MnO2) in-situ grows on PANI/RGO hybrid nanosheets to obtain ternary hierarchical nanosheets MnO2/PANI/RGO by simply mixing PANI/RGO and KMnO4 under mild condition.The electrochemical behavior shows thatMnO2/PANI/RGOelectrode materialis a typical pseudo-capacitance.In comparison with RGO, PANI, and PANI/RGO hybrid nanosheets, MnO2/PANI/RGO composites display the highest specific capacitance of 1090.2 F g−1at0.5 A g−1inthree-electrode configuration.They maintain 82.3% initial capacitance after5000consecutivecycles at0.5A g−1. The excellentelectrochemicalperformance is attributed to nanometer-sized flaky MnO2 in-situ growth on the surface ofPANI/RGO, whichcan enhance electrode/electrolyte interface areas, provide high electroactive regions and short diffusion lengths, andprotect the structure ofcompositeseffectively.Thus, the sandwich-liketernary hierarchical nanosheetsofMnO2/PANI/RGOare excellent electrode material in supercapacitor with high specific capacitance andthelong-term cycle stability, which is helpful in developing new kinds of portable energy storage devices.

Chemical Engineering Journal2016, 304, 29–38.

论文连接：http://dx.doi.org/10.1016/j.cej.2016.06.060