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Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Microwave-assisted non-aqueous homogenous precipitation of nanoball-like mesoporous α-Ni(OH)2 as a precursor for NiOx and its application as a pseudocapacitor

Language

English

Abstract

A novel facile and template-free method to prepare a nanoball-like NiO x material has been developed. The preparation involves the synthesis of an α-Ni(OH) 2 precursor by microwave heating and calcination of the precursor. The NiO x material possesses a nanoball-like structure with a large surface area. The pseudo-capacitive properties of the NiO x material were evaluated by cyclic voltammetry and electro-chemical impedance spectroscopy in 6 M KOH solution. The specific capacitances were 951, 796, 713 and 650 F g -1, corresponding to the scan rates of 2.0, 5.0, 10 and 20 mV s -1, respectively. The NiO x material also showed excellent cycling stability and maintained 92% of its maximum specific capacitance after 1000 cycles. The hybrid supercapacitor based on this NiO x material exhibited moderate energy density and power density. © 2012 The Royal Society of Chemistry.

Publication Date

2012

Source Publication Title

Journal of Materials Chemistry

Volume

22

Issue

16

Start Page

8029

End Page

8035

Publisher

Royal Society of Chemistry

ISSN (print)

09599428

ISSN (electronic)

13645501

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