Construction of NiMoO4/Polypyrrole Nanocomposites on Carbon Cloth As Advanced Electrodes for High Performance Flexible Supercapacitors

Abstract

With the rapid development of new-generation flexible electronics, future power sources are required to be mechanically flexible and also have both high energy and large power as well as long cycle life. Flexible Supercapacitors have been widely investigated by the reasons of their excellent electrochemical performance such as high power delivery, operational safety, long cycle life and flexibility. Flexible electrodes, owing to their unique advantages like flexible and wearable, have drawn many attentions. However, there still exist some challenges to improve flexible electrode materials’ conductive property and excellent cycle stability. In this paper, NiMoO4/Polypyrrole (PPy)/carbon cloth (CC) flexible electrode is proposed, using a hydrothermal synthesis method and a chemical polymerization process, to solve these issues. The designed NiMoO4/PPy/CC electrode has following advantages: 1) the electrode is flexible, light weight, good electrical conductivity (PPy possesses higher conductivity which can ensure the conductivity of the materials). 2) the NiMoO4 nanowires can directly grow on the substrate without using any binders and provide a frame support for PPy nanoparticles cladding, which can effective reduce the charge-transfer resistance and shorten the path of ion diffusion and electron transport. 3) nanocomposites can directly provide the current channels and transfer the electrons more efficient. 4) the hybrid structure can prevent the electrode material’s damage from volume change in the charge-discharge process and prove the long cycle life. 5) the designed nanocomposites can take advantages of all good function of components and achieve a synergistic effect. So the electrode exhibits a high areal specific capacitance of 1.64 F cm-2 at a current density of 1mA cm-2 and capacitance retention 98.2% after 2000 cycles. The results showed that the NiMoO4/PPy exhibit remarkable electrochemical performance, which could be utilized as a promising pseudocapacitive electrode material for high performance flexible supercapacitors. (This paper is funded by the International Exchange Program of Harbin Engineering University for Innovation-oriented Talents Cultivation.) Figure 1