Energy Breakthrough, A Supercapacitor Battery Made From Hemp

August 22, 2014 - via University of Alberta

Marijuana could solve one of America’s biggest problems, without anyone smoking it. As Hemp makes a comeback in the US after a decades-long ban on its cultivation, scientists are reporting that fibers from the plant can pack as much energy and power as graphene, long-touted as the model material for supercapacitors.

Marijuana (Hemp) can be used to store energy
At the American Chemical Society’s national meeting this week, researchers from the University of Alberta unveiled a way to create extremely efficient batteries called “supercapacitors” using specially treated Hemp, a non-psychoactive variation of the Marijuana plant. That means Hemp could be a low-cost, renewable raw material that revolutionizes energy storage.

How it works
Hemp fibers are heated over the course of 24 hrs, causing the material’s carbon atoms to align and form nanosheets, each of which are only one carbon atom thick, and which can be used as conductors in batteries.

The basic structure of a supercapacitor

One of the battery’s most impressive features is its ability to discharge energy very quickly, which could drastically cut down charging times. You could recharge the device you’re reading this article on in seconds.

Why it’s a breakthrough
Prior to this finding, supercapacitors used lab-created carbon nanosheets, a material called graphene. Hemp is proving to be far more efficient. According to a press release, “The hemp-based devices yielded energy densities as high as 12 watt-hours per kilogram, 2 to 3 times higher than commercial counterparts.” That means we can charge up electronic devices faster and more efficiently than we currently do. But, the storage capacity of hHemp supercapacitors is less than ones that use graphene.

Despite a smaller storage capacity, Hemp is a better choice, because graphene is far more expensive to synthesize, and Hemp is a sturdy, renewable resource that can flourish in a range of climates.

With this discovery, supercapacitors could rely exclusively on Hemp rather than graphene, and the batteries would be inexpensive and easily replaceable. At this point, it is a proof of concept, but it could challenge the current market for energy storage devices, which would struggle to compete with such a cheap alternative.

This research was  presented at the 248thNational Meeting & Exposition of the American Chemical Society (ACS), the world’s largest scientific society.

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Author:Paul Ebeling

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