NiO/nanoporous graphene composites with excellent supercapacitive performance produced by atomic layer deposition.
Nanotechnology
; 25(50): 504001, 2014 Dec 19.
Article
em En
| MEDLINE
| ID: mdl-25426539
ABSTRACT
Nickel oxide (NiO) is a promising electrode material for supercapacitors because of its low cost and high theoretical specific capacitance of 2573 F g(-1). However, the low electronic conductivity and poor cycling stability of NiO limit its practical applications. To overcome these limitations, an efficient atomic layer deposition (ALD) method is demonstrated here for the fabrication of NiO/nanoporous graphene (NG) composites as electrode materials for supercapacitors. ALD allows uniform deposition of NiO nanoparticles with controlled sizes on the surface of NG, thus offering a novel route to design NiO/NG composites for supercapacitor applications with high surface areas and greatly improved electrical conductivity and cycle stability. Electrochemical measurements reveal that the NiO/NG composites obtained by ALD exhibited excellent specific capacitance of up to â¼ 1005.8 F g(-1) per mass of the composite electrode (the specific capacitance value is up to â¼ 1897.1 F g(-1) based on the active mass of NiO), and stable performance after 1500 cycles. Furthermore, electrochemical performance of the NiO/NG composites is found to strongly depend on the size of NiO nanoparticles.
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Bases de dados:
MEDLINE
Idioma:
En
Revista:
Nanotechnology
Ano de publicação:
2014
Tipo de documento:
Article