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2015 | "Dendritic Ni(Cu)-polypyrrole hybrid films for a pseudo-capacitor" Nan…

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Title : Dendritic Ni(Cu)-polypyrrole hybrid films for a pseudo-capacitor
Authors: Bit Na Choi, Woo Won Chun, Aniu Qian, So Jeong Lee and Chan-Hwa Chung

Journal : Nanoscale
Vol/No/Page : 7/44/18561-18569
DOI : 10.1039/c5nr05541e

Abstract :
Dendritic Ni(Cu)–polypyrrole hybrid films are fabricated for a pseudo-capacitor in a unique morphology
using two simple methods: electro-deposition and electrochemical de-alloying. Three-dimensional
structures of porous dendrites are prepared by electro-deposition within the hydrogen evolution reaction
(HER) at a high cathodic potential; the high-surface-area structure provides sufficient redox reactions
between the electrodes and the electrolyte. The dependence of the active-layer thickness on the supercapacitor
performance is also investigated, and the 60 μm-thick Ni(Cu)PPy hybrid electrode presents the
highest performance of 659.52 F g−1 at the scan rate of 5 mV s−1. In the thicker layers, the specific capacitance
became smaller due to the diffusion limitation of the ions in an electrolyte. The polypyrrole-hybridization
on the porous dendritic Ni(Cu) electrode provides superior specific capacitance and excellent
cycling stability due to the improvement in electric conductivity by the addition of conducting polypyrrole
in the matrices of the dendritic nano-porous Ni(Cu) layer and the synergistic effect of composite
materials.

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