Supercapacitors Made from Hybrid Nano-Yarn

  • Author:
  • Published: 10 April 2017
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
  • Source / Publisher: Energy Technology/Wiley-VCH
thumbnail image: Supercapacitors Made from Hybrid Nano-Yarn

Supercapacitors can store a lot more energy than other capacitors and deliver it much faster than a rechargeable battery. Flexible supercapacitors could be particularly useful for flexible and wearable electronics. As materials for such devices, metal oxides can provide high energy densities, while carbon nanotubes (CNTs) are highly flexible.

Qiufan Wang, Daohong Zhang, South-Central University for Nationalities, Wuhan, China, Menghe Miao, CSIRO Manufacturing, Waurn Ponds, Australia, and colleagues have combined both those materials to produce flexible linear supercapacitors with high energy densities. The team first created a two-ply yarn by twisting a copper nanowire around a fiber made from CNTs. Nanostructured NiCo2O4 was then deposited on the yarn using a hydrothermal method to give finished electrodes (pictured). The metal oxide's nanostructure depends on the reaction time. The electrodes were coated with a poly(vinyl alcohol) (PVA)/KOH gel electrolyte and two electrodes were combined to form a supercapacitor.

The developed supercapacitor has an energy density of 35.76 mWh cm2 and a power density of 0.154 mW cm–2. The device is flexible and can be woven into fabric without losing its storage capacity. The material's capacitance remains at 89 % after 5000 charge/discharge cycles. The device could, for example, be used to power light-emitting diodes (LEDs).


Article Views: 2189

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from, please contact us first for permission and consult our permission guidance prior to making your request

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH