High-performance supercapacitor materials based on polypyrrole composites embedded with core-sheath polypyrrole@MnMoO4 nanorods

• Published in: Electrochimica acta 2016-09, Vol.212, p.775-783
• Main Authors: Wang, Huan, Song, Yahui, Zhou, Jingkuo, Xu, Xiaoyang, Hong, Wei, Yan, Jing, Xue, Ruinan, Zhao, Huilin, Liu, Yu, Gao, Jianping
• Format: Article
• Language: English
• Subjects: capacitance; core-sheath; MnMoO4; polypyrrole; symmetric supercapacitor
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2016.07.035

In this study, a binary composite polypyrrole@MnMoO4 was facilely prepared via in situ oxidative polymerization of monomer in the presence of MnMoO4 nanorods The MnMoO4 nanorods were wrapped by a layer of polypyrrole (PPy) and formed a core-sheath structure which embedded in PPy matrix. The prepared PPy@MnMoO4 composite was characterized by XRD, IR, SEM, and TEM spectroscopy and its capacitive performance was investigated. Electrochemical measurements show that the specific capacitance of PPy@MnMoO4 composite (MnMoO4 content is 13.95wt%) reached 462.9Fg−1 at a scan rate of 5mVs−1 and 374.8Fg−1 at a current density of 0.2Ag−1 in a three-electrode system. In the two-electrode system of a symmetric supercapacitor, it achieved specific capacitances of about 221.3Fg−1 at a scan rate of 5mVs−1 and 207.5Fg−1 at a current density of 0.5Ag−1. The PPy@MnMoO4 retained 80.6% of its initial capacitance after 1000 cycles. The excellent electrochemical performance of PPy@MnMoO4 composite is attributed to the synergistic effects between the polymer chain and MnMoO4 in PPy@MnMoO4 and its well-designed structure.