Hybrid core–shell nanostructured electrodes made of polypyrrole nanotubes coated with Ni(OH)2 nanoflakes for high energy-density supercapacitors. Issue 18 (5th February 2016)

• Record Type: Journal Article
• Authors: Wolfart, Franciele; Dubal, Deepak P.; Vidotti, Marcio; Gómez-Romero, Pedro
• Is Part Of: RSC advances. Volume 6:Issue 18(2016)
• Page Start: 15062
• Page End: 15070
• Publication Date: 2016-02-05
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra23671a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : SEM image of Ni(OH)2 @PPy-NTs core–shell nanostructure and galvanostatic charge/discharge curves of PPy-NTs, Ni(OH)2 and Ni(OH)2 @PPy-NTs nanostructures. Abstract : This work describes the design of Ni(OH)2 @PPy-NTs core–shell nanostructures with potential application as an electrode material for supercapacitors. Initially, one dimensional (1D) polypyrrole nanotubes (PPy-NTs) were synthesized through a chemical oxidation mediated soft template-directed route using as the anion the azo dye methyl orange (MO). Subsequently, three dimensional (3D) Ni(OH)2 nanoflakes were grown onto PPy-NTs by a simple hydrothermal route. This exclusive Ni(OH)2 @PPy-NTs nano-architecture helps to improve the overall electrochemical performance of the electrode, due to the high surface area provided by 3D nanoflakes and excellent electronic/ionic conductivity of 1D nanotubes. The maximum specific capacitance obtained for Ni(OH)2 @PPy-NTs was 536 F g −1 with good capacity retention after 1000 charge/discharge cycles. Last but not least, EIS technique showed a low electrochemical series resistance for Ni(OH)2 @PPy-NTs confirming their promise as a high-performance energy storage material.