Hierarchical Ni-Co layered double hydroxide nanosheets entrapped on conductive textile fibers: a cost-effective and flexible electrode for high-performance pseudocapacitors

• Published in: Nanoscale 2016-01, Vol.8 (2), p.812-825
• Main Authors: Nagaraju, Goli, Raju, G. Seeta Rama, Ko, Yeong Hwan, Yu, Jae Su
• Format: Article
• Language: English
• Subjects: Electric potential; Electrochemical analysis; Electrodes; Hydroxides; Nanostructure; Nickel; Three dimensional; Voltage
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/c5nr05643h

Hierarchical three-dimensional (3D) porous nanonetworks of nickel-cobalt layered double hydroxide (Ni-Co LDH) nanosheets (NSs) are grown and decorated on flexible conductive textile substrate (CTs) via a simple two-electrode system based electrochemical deposition (ED) method. By applying a proper external cathodic voltage of −1.2 V for 15 min, the Ni-Co LDH NSs are densely deposited over the entire surface of the CTs with good adhesion. The flexible Ni-Co LDH NSs on CTs (Ni-Co LDH NSs/CTs) architecture with high porosity facilitates enhanced electrochemical performance in 1 M KOH electrolyte solution. The effect of growth concentration and external cathodic voltage on the electrochemical properties of Ni-Co LDH NSs/CTs is also investigated. The Ni 10 Co 5 LDH NSs/CTs electrode exhibits a high specific capacitance of 2105 F g −1 at a current density of 2 A g −1 as well as an excellent cyclic stability as a pseudocapacitive electrode due to the advantageous properties of 3D interconnected porous frameworks of Ni 10 Co 5 LDH NSs/CTs. This facile fabrication of bimetallic hydroxide nanostructures on CTs can provide a promising electrode for low-cost energy storage device applications. Hierarchical 3D porous nanonetworks of Ni-Co layered double hydroxide nanosheets are grown on flexible conductive textile substrates via a simple two-electrode system based electrochemical deposition method.