Self-assembled hierarchical β-cobalt hydroxide nanostructures on conductive textiles by one-step electrochemical deposition

Goli Nagaraju,Jae Su Yu,Yeong Hwan Ko

doi:10.1039/c4ce01696c

Abstract

Three-dimensional (3D) hierarchical cabbage-like β-cobalt hydroxide (β-Co(OH)2) nanostructures were fabricated onto conducive textiles composed of copper-coated polyethylene terephthalate fibers by a simple one-step electrochemical deposition (ED) method. Under an external applied voltage of −0.75 V for 4 h, the hierarchical cabbage-like β-Co(OH)2 nanostructures were well decorated on the conductive textiles. During the ED process, they were self-assembled by the tangled layers of nanoplate (thickness of ~45–55 nm) building blocks and exhibited a cabbage-shaped architecture. The structure and morphology of the as-prepared hierarchical cabbage-like β-Co(OH)2 nanostructures were characterized. The growth mechanism of cabbage like β-Co(OH)2 nanostructures was also investigated by varying the growth time. Moreover, the feasibility test for supercapacitors by measuring the electrochemical properties of the as-prepared nanostructures was performed by cyclic voltammetry and galvanic charge–discharge measurements. The obtained results show that the cabbage-like β-Co(OH)2 nanostructures on the conductive textile substrate exhibited superior energy storage performance compared to the nanoplate morphology.

Highlights

In recent years, a lot of effort has been focused on the development of low-cost, portable, and eco-friendly electrical energy storage devices for high-power energy sources.[1,2] the flexible devices based on nickel (Ni) foam and metal sheet substrates have attracted increasing attention due to their flexibility and light weight compared to the rigid, heavy, and bulky substrates.[3,4] these applications still have several problems including expensive production and complicated fabrication processing
To fulfill the above requirements, the textile-based devices can be expected to solve the problems from their natural advantageous properties of low cost, high flexibility, low weight, and large surface area of conductive textile fibers.[5,6,7,8]
The cabbage-like β-CoIJOH)[2] nanostructures were synthesized by the one-step ED process using a simple two-electrode system

Summary

Introduction

A lot of effort has been focused on the development of low-cost, portable, and eco-friendly electrical energy storage devices for high-power energy sources.[1,2] the flexible devices based on nickel (Ni) foam and metal sheet substrates have attracted increasing attention due to their flexibility and light weight compared to the rigid, heavy, and bulky substrates.[3,4] these applications still have several problems including expensive production and complicated fabrication processing. To fulfill the above requirements, the textile-based devices can be expected to solve the problems from their natural advantageous properties of low cost, high flexibility, low weight, and large surface area of conductive textile fibers.[5,6,7,8]. Divalent transition metal hydroxides (DTMHs) have received great research interest in a wide range of application fields because of their novel electrical, physical, and chemical properties.[9,10] Among various DTMHs, CoIJOH)[2] has promising potential as an electroactive and catalyst material in many fields of applications such as

Methods

Results

Conclusion