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Core-shell hybrid nanostructure based on polypyrrole nanotubes coated with Ni(OH)2 for high performance supercapacitors

AuthorsWolfart, Franciele; Dubal, Deepak P. CSIC ORCID; Vidotti, Marcio; Gómez-Romero, P. CSIC ORCID
Issue Date2017
CitationIUPAC 2017
AbstractThe design of Ni(OH)2@PPy-NTs core–shell nanostructures with potential application as an electrode material for supercapacitors were developed. Firstly, one dimensional polypyrrole nanotubes (PPy-NTs) were synthesized through a chemical oxidation mediated soft templatedirected route using as the anion the azo dye methyl orange. Afterwards, three dimensional Ni(OH)2 nanoflakes were grown onto PPy-NTs by a simple hydrothermal route. The scanning electronic microscopy (SEM) and transmission electronic microscopy (TEM) images of the PPyNTs showed the nanotubes are randomly spread with well-developed, highly open and porous structure (Figure 1(a-b)). Figure 1(c-d) display the SEM and TEM images of the Ni(OH)2@PPyNTs, which it is possible to see that no Ni(OH)2 is packed in the interspaces of the nanotubes, suggesting that Ni(OH)2 nanoflakes are preferentially deposited onto the PPy-NTs surface. Spectroscopic characterization by X-ray photoelectron spectroscopy (XPS) confirm the presence of the both PPy and Ni(OH)2 in the final composite. The XRD patterns of the hybrid material indicated the formation of the α-Ni(OH)2 polymorph which can improve the electrochemical properties of the electrode. The specific surface area of the materials were investigated using N2 adsorption / desorption isotherms. The values obtained were 27.1, 43.2 and 77.0 m2g-1 for Ni(OH)2, PPy-NTs and Ni(OH)2@PPy-NTs, respectively. The unique core–shell heterostructured Ni(OH)2@PPy-NTs configuration helps to improve the electrochemical performance of the electrode, due to the high surface area and synergistic effects of the combined pseudocapacitive behavior from the PPy-NTs and the faradaic process of the Ni(OH)2 (Figure 1(e)). The maximum specific capacitance obtained for Ni(OH)2@PPy-NTs was 536 F g-1 (Figure 1(f)) with 90.4 % of capacity retention after 1000 galvanostatic charge/discharge cycles (GCDC). The specific energy (12 Wh kg-1) and power (1143 W kg-1) values includes de Ni(OH)2@PPy-NTs amongst the high performance energy storage materials.
DescriptionResumen del trabajo presentado a la 49th IUPAC General Assembly, celebrada en Sao Paulo (Brasil) del 7 al 13 de julio de 2017.
Appears in Collections:(CIN2) Comunicaciones congresos

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