Highly Porous Carbon Made from Rice Husks

  • Author: ChemistryViews.org
  • Published: 13 July 2017
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
  • Source / Publisher: ACS Sustainable Chemistry & Engineering/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: Highly Porous Carbon Made from Rice Husks

Porous carbon materials can be useful for, e.g., energy storage, catalysis, or adsorption and separation. This is due to their large specific surface areas. Their synthesis, however, often needs multiple steps and relatively large amounts of corrosive chemicals such as KOH or HF.

Yeru Liang, Yingliang Liu, and colleagues, South China Agricultural University, Guangzhou, have developed a simple synthesis of highly porous carbon from rice husks, a sustainable resource that would otherwise be considered waste. The team powdered the rice husks and mixed them with polytetrafluoroethylene (PTFE) powder. The mixture was then carbonized at 900 °C to give the desired product.

During the carbonization process, the PTFE powder generates HF in situ. This, in turn, can etch out naturally occurring nanosilica particles in the rice husks. This process leads to the formation of pores in the carbonized material and to a large surface area. It avoids the need for a separate silica template-removal step and for the use of HF in pure form. The researchers tested the synthesized highly porous carbon in a supercapacitor for energy storage and found that the material provides a large capacitance and a good rate performance.


Article Views: 1607

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 ChemistryViews.org, please contact us first for permission. more

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