Easier and Greener Production of Supercapacitors

  • Author: ChemSusChem
  • Published Date: 29 May 2020
  • Source / Publisher: ChemSusChem/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Easier and Greener Production of Supercapacitors

Related Societies

The synthesis of porous electrode materials often requires extensive purification steps, which results in large amounts of waste and low yields. Porous carbon materials are often used as abundant, cheap electrode materials. However, their surface properties are often not optimal for use with polar electrolytes, which leads to a need for modifications such as doping. Covalent triazine frameworks (CTFs) could be an alternative to porous carbon materials: They have adjustable properties that can be finely tuned by selecting a suitable monomer.


Lars Borchardt, Ruhr-Universität Bochum (RUB), Germany, Stefan Kaskel, Technische Universität Dresden, Germany, and colleagues have developed a CTF synthesis that avoids the need for purification. Instead, it uses the by-product as a valuable component for the final product—in this case, a supercapacitor. The CTFs were synthesized by a trimerization reaction of aromatic nitriles (pictured below) under ionothermal conditions in molten ZnCl2. In this process, ZnCl2 serves multiple purposes, namely, as the solvent, as the Lewis acid to trigger the trimerization, and as the porogen, i.e., the component that acts as a scaffold for the pores.


After the synthesis, the CTF material still contains a large amount of ZnCl2, which is dispersed finely throughout the whole sample. Removing this residue usually requires extensive washing procedures. However, the supercapacitor still needs an electrolyte in addition to the CTF electrode. The team used the ZnCl2 residue to create this electrolyte and avoid waste at the same time. The addition of water generates an aqueous ZnCl2 electrolyte in situ and simultaneously unblocks the pores of the CTF (pictured below). This approach circumvents extensive and time‐consuming washing steps and makes the process more environmentally friendly.

 


 

 

Article Views: 772

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

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


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