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Issue 102, 2016, Issue in Progress
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Nanoporous gold–copper oxide based all-solid-state micro-supercapacitors

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The rapid growth of miniaturized electronic devices has increased the demand for energy storage devices with small dimensions. Micro-supercapacitors have great potential to supplement or replace batteries and electrolytic capacitors for a wide range of applications. Micro-supercapacitor can be fabricated with micro-electronic devices for efficient energy storage unit. However, the lower energy densities of micro-supercapacitors are still a bigger challenge to its application in micro devices. In this paper, we report all-solid-state nanoporous gold (NPG)–copper oxide (CuO) based micro-supercapacitor prepared using a simple fabrication process. In this process, first NPG interdigital patterns were developed by using a simple annealing and dealloying procedure, and then CuO was electrodeposited on NPG interdigital microelectrodes. The nanoporous gold substrate provides good electronic/ionic conductivity with high intrinsic surface area for the electrodeposition of CuO, which forms a novel hybrid electrode. The NPG–CuO micro-supercapacitor exhibits maximum areal capacitance 26 mF cm−2, maximum specific energy 3.6 μW h cm−2 and maximum specific power 646 μW cm−2. NPG–CuO micro-supercapacitors show excellent cyclic stability with 98% capacitance retention after 10 000 cycles.

Graphical abstract: Nanoporous gold–copper oxide based all-solid-state micro-supercapacitors

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The article was received on 04 Aug 2016, accepted on 15 Oct 2016 and first published on 17 Oct 2016

Article type: Paper
DOI: 10.1039/C6RA19744B
Citation: RSC Adv., 2016,6, 100467-100475
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    Nanoporous gold–copper oxide based all-solid-state micro-supercapacitors

    B. K. Singh, A. Shaikh, S. Badrayyana, D. Mohapatra, R. O. Dusane and S. Parida, RSC Adv., 2016, 6, 100467
    DOI: 10.1039/C6RA19744B

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