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Published on May 28th, 2018 | by Steve Hanley

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Chinese Researchers Make Sustainable Supercapacitors From Wood

May 28th, 2018 by  


Supercapacitors are touted by many as the wave of the future when it comes to battery storage for everything from cell phones to electric cars. Unlike batteries, supercapacitors can charge and discharge much more rapidly — a boon for impatient drivers who want to be able to charge their electric cars quickly.

supercapacitorThe key to supercap performance is electrodes with a large surface area and high conductivity that are inexpensive to manufacture, according to Science Daily. Carbon aerogels satisfy the first two requirements but have significant drawbacks. Some are made from phenolic precursors which are inexpensive but not environmentally friendly. Others are made from  graphene and carbon nanotube precursors but are costly to manufacture.

Researchers at the University of Science and Technology of China have discovered a new process that is low cost and sustainable using nanocellulose, the primary component of wood pulp that gives strength to the cell walls of trees. Once extracted in the lab, it forms a stable, highly porous network which when oxidized forms a micro-porous hydrogel of highly oriented cellulose nano-fibrils of uniform width and length.

Like most scientific research, there was not a straight line between the initial discovery and the final process. A lot of tweaking went on in the lab to get things to work just right. Eventually, it was found that heating the hydrogel in the presence of para-toluenesulfonic acid, an organic acid catalyst, lowered the decomposition temperature and yielded a “mechanically stable and porous three dimensional nano-fibrous network” featuring a “large specific surface area and high electrical conductivity,” the researchers say in a report published by the journal Angewandte Chemie International.

The chemists have been able to create a low cost, environmentally friendly wood-based carbon aerogel that works well as a binder-free electrode for supercapacitor applications with electro-chemical properties comparable to commercial electrodes currently in use. Now the hard work of transitioning this discovery from the laboratory to commercial viability will begin. 
 





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About the Author

Steve writes about the interface between technology and sustainability from his home in Rhode Island and anywhere else the Singularity may lead him. His motto is, "Life is not measured by how many breaths we take but by the number of moments that take our breath away!" You can follow him on Google + and on Twitter.



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