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ACS Appl Mater Interfaces. 2015 Mar 4;7(8):4851-60. doi: 10.1021/am508816t. Epub 2015 Feb 23.

Designing 3D highly ordered nanoporous CuO electrodes for high-performance asymmetric supercapacitors.

Author information

1
Department of Chemistry, Tarbiat Modares University , Tehran 14115-175, Iran.

Abstract

The increasing demand for energy has triggered tremendous research efforts for the development of lightweight and durable energy storage devices. Herein, we report a simple, yet effective, strategy for high-performance supercapacitors by building three-dimensional pseudocapacitive CuO frameworks with highly ordered and interconnected bimodal nanopores, nanosized walls (∼4 nm) and large specific surface area of 149 m(2) g(-1). This interesting electrode structure plays a key role in providing facilitated ion transport, short ion and electron diffusion pathways and more active sites for electrochemical reactions. This electrode demonstrates excellent electrochemical performance with a specific capacitance of 431 F g(-1) (1.51 F cm(-2)) at 3.5 mA cm(-2) and retains over 70% of this capacitance when operated at an ultrafast rate of 70 mA cm(-2). When this highly ordered CuO electrode is assembled in an asymmetric cell with an activated carbon electrode, the as-fabricated device demonstrates remarkable performance with an energy density of 19.7 W h kg(-1), power density of 7 kW kg(-1), and excellent cycle life. This work presents a new platform for high-performance asymmetric supercapacitors for the next generation of portable electronics and electric vehicles.

KEYWORDS:

3D highly ordered electrodes; asymmetric supercapacitor; copper oxide; nanoporous

PMID:
25671715
DOI:
10.1021/am508816t

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