Hemp nanosheets could be better than graphene for making the ideal supercapacitor

Kurzweil Accelerating Intelligence ^ | June 16, 2015

[ClearCase_guy]

Wait ... what?

[NonValueAdded]

Don’t Bogart that nanosheet, my friend; pass it over to me.

[Yo-Yo]

His team found that if they heated the fibers for 24 hours at a little over 350 degrees Fahrenheit, and then blasted the resulting material with more intense heat, it would exfoliate into carbon nanosheets.

Supercapacitor Brownies?

[Samurai_Jack]

[PapaBear3625]

The hemp-based devices yielded energy densities as high as 12 Watt-hours per kilogram, two to three times higher than commercial counterparts.

Meanwhile, gasoline has an energy density of 12,200 Wh/kg.

[KarlInOhio]

Wikipedia lists a lead acid battery at 33-42 Wh/kg.

[ShadowAce]

[Riflema]

So, they make graphene from hemp, and it’s more efficient than, er, graphene?

[Flick Lives]

Think I got some hemp nano sheets from Ikea. Very nice.

[2ndDivisionVet]

This process seems to be MUCH LESS expensive than making graphene and almost as efficient in this use.

[cuban leaf]

I fully get your point. However, you can’t recharge gasoline. Then again, it would take more than a thousand charges for it to equal one gasoline “discharge”.

[Buckeye McFrog]

Who knew it would run on doobie power?

[Noumenon]

Well, here you go...

[Noumenon]

Most people have no idea about the energy density of modern liquid fuels and how that affects their everyday lives. And what it might mean not to have any.

[PapaBear3625]

I fully get your point. However, you can’t recharge gasoline.

You can "recharge" your gas tank in a couple of minutes at a filling station, versus recharging your battery in however long it takes, from electricity that was mostly generated by fossil fuel.

[RightOnTheBorder]

I have read of graphene capacitors in the 35 Wh/Kg range. While the hemp based capacitors may be cheaper, are they 3 times cheaper?

[cuban leaf]

I’m with you. Ever since I learned, about 25 years ago, how much energy is in a “pound of battery” vs a “pound of gasoline” I stopped being an advocate of electric power, unless the power comes from solar cells, etc.

The ONLY thing special about modern electric cars and hybrids is the ability to reclaim energy when slowing down. Period.

[Still Thinking]

...... but you’ll get arrested by the DEA if you try to grow any nanosheets.

[martin_fierro]

The computer clock freezes at 4:20.