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NiCo2O4@Polyaniline Nanotubes Heterostructure Anchored on Carbon Textiles with Enhanced Electrochemical Performance for Supercapacitor Application

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journal contribution
posted on 10.10.2019, 21:14 by Chenhao Pan, Zhaohui Liu, Wen Li, Yunpeng Zhuang, Qi Wang, Shougang Chen
NiCo2O4 is one of the most promising supercapacitor electrode materials. However, its capacitance and cycle stability require further improvement for practical application. Herein, a porous NiCo2O4 nanotube array@polyaniline (NiCo2O4@PANI) electrode grown directly on carbon textiles is designed and synthesized through a facile two-step method. Electrochemical tests show that the NiCo2O4@PANI/carbon textiles composite electrode exhibits a higher specific capacity (720.5 C g–1, 10.38 C cm–3 in terms of volumetric capacity) than an electrode of pure NiCo2O4 at a current density of 1 A g–1. Additionally, the PANI layer is also beneficial to prevent the deformation of the tubular NiCo2O4 and to keep 99.64% capacity retention after 10 000 cycles. The prominent electrochemical capacitive properties of the NiCo2O4@PANI electrode are not only attributed to the extra pseudo-capacitance originating from PANI but also the synergistic effects of NiCo2O4 and PANI. Detailed investigation of the electrochemical impedance spectroscopy and UV–vis–NIR spectrophotometry data reveals decreased charge transfer resistance. Further mechanism and dynamics analysis based on cyclic voltammetry (CV) and X-ray photoelectron spectroscopy (XPS) reveals that the composite electrode shows enhanced redox and surface-capacitive behavior because of the coated PANI. This work provides an effective strategy to improve the supercapacitor performance by inducing interactions based on heterostructure, and the prepared NiCo2O4@PANI composite electrode exhibits potential applications in emerging electrochemical energy storage devices.