Weed!

[Scouse]

As cheap energy storage!

"They work down to 0C and display some of the best power-energy combinations reported in the literature for any carbon.

For example, at a very high power density of 20 kW/kg (kilowatt per kilo) and temperatures of 20, 60, and 100C, the energy densities are 19, 34, and 40 Wh/kg (watt-hours per kilo) respectively.

Fully assembled, their energy density is 12 Wh/kg, which can be achieved at a charge time less than six seconds...

for energy storage,...it costs a fraction of the price [of graphene]-$500-1,000 a tonne

That's a find eh? Thought it deserved it's own thread

 

[DaGaffer]

As cheap energy storage!


That's a find eh? Thought it deserved it's own thread

But isn't this a CO2 emitter?

 

[Scouse]

But isn't this a CO2 emitter?

What? Burning hemp to make graphene?

I daresay that process would release some CO2 - but if the reusable application of the end product can be used in the production of an incredibly efficient energy storage device that could help herald in an ultra-low-carbon energy future then I'm sure we could offset what we make during production eh?

 

[old.Tohtori]

Yeah like anyone in that field would have the energy to actually complete it.

 

[DaGaffer]

What? Burning hemp to make graphene?

I daresay that process would release some CO2 - but if the reusable application of the end product can be used in the production of an incredibly efficient energy storage device that could help herald in an ultra-low-carbon energy future then I'm sure we could offset what we make during production eh?

Its less than half the energy density of petroleum. I honestly don't have a clue about how much CO2 is released in making this stuff, or the difference compared to just setting fire to oil. The article doesn't really explain that.

 

[Scouse]

Its less than half the energy density of petroleum.

Yeah, but you use petroleum ONCE.

You can use this as an energy storage medium for years. Charge, discharge, charge, discharge.

It's energy density is pretty amazing tbfh.

 

[Chilly]

Its less than half the energy density of petroleum. I honestly don't have a clue about how much CO2 is released in making this stuff, or the difference compared to just setting fire to oil. The article doesn't really explain that.

As long as you grow and then crop the ganj each time the net effect on carbon in the atmosphere is null as the co2 it emits when burned was taken from the atmosphere a few months previously and will be taken back again by the next crop.

 

[old.Tohtori]

EAsier way to fix the world would be to legalise and tax the stuff. Could easily fix a few hunger issues and some with the proceeds.

If governments worked with half a non selfish brain that is

 

[DaGaffer]

Yeah, but you use petroleum ONCE.

You can use this as an energy storage medium for years. Charge, discharge, charge, discharge.

It's energy density is pretty amazing tbfh.

Sorry, my mistake, its less than half the power density of petroleum, its massively lower on an energy density (Wh/KG) basis. (12,200 v. 40), so I guess if it works for 305 hours or above its more efficient than burning petrol.

 

[DaGaffer]

As long as you grow and then crop the ganj each time the net effect on carbon in the atmosphere is null as the co2 it emits when burned was taken from the atmosphere a few months previously and will be taken back again by the next crop.

Fair enough, the comparison should be to biodiesel or ethanol then, but with the advantage that this is from "waste" product already.

 

[Scouse]

Fair enough, the comparison should be to biodiesel or ethanol then, but with the advantage that this is from "waste" product already.

They don't "burn" the graphene m8. The use graphene as an energy storage device. A large battery. So - you produce it from hemp at an incredibly cheap price and then you can use it to store energy incredibly densely.

Maybe it's cheap enough to make massive energy storage devices for excess energy production from wind farms, for example?

I understand that the reason they don't use graphene batteries in electric cars is that they're too expensive to produce - but if this method produces it 1000 times cheaper?

 

[DaGaffer]

They don't "burn" the graphene m8. The use graphene as an energy storage device. A large battery. So - you produce it from hemp at an incredibly cheap price and then you can use it to store energy incredibly densely.

Maybe it's cheap enough to make massive energy storage devices for excess energy production from wind farms, for example?

I understand that the reason they don't use graphene batteries in electric cars is that they're too expensive to produce - but if this method produces it 1000 times cheaper?

Of course they don't burn it, but the battery has a certain energy density available over its lifetime. If you know what that lifetime is, you can judge the value of the battery as a storage device, compared to other energy storage methods (which is all petrol is, a very dense energy storage method).

 

[Scouse]

If you know what that lifetime is, you can judge the value of the battery as a storage device, compared to other energy storage methods (which is all petrol is, a very dense energy storage method).

Been looking for the lifetime of a graphene battery but can't find it. But if it's almost half as efficient as petrol yet can discharge that stored energy thousands of times (which it has to - graphene is already being sidelined into making laptop, mobile phone and car batteries orders of magnitude more efficient) - then that's pretty good going.

It's not like it's degradeable chemical storage of electrons. It's a one-molecule-thick sheet of carbon that can be charged and discharge at unbelieveable rates. It's potential is astounding.

 

[Gwadien]

This has been an idea for a long time, my pothead friends have been going on about it but I, like most others passed it off as an excuse to legalise em jay.

Mass production would mean they have to legalise weed or have high security ganja farms.

 

[DaGaffer]

This has been an idea for a long time, my pothead friends have been going on about it but I, like most others passed it off as an excuse to legalise em jay.

Mass production would mean they have to legalise weed or have high security ganja farms.

No it doesn't. There's plenty of non-THC varieties of hemp; what do you think they make rope from?

 

[DaGaffer]

Been looking for the lifetime of a graphene battery but can't find it. But if it's almost half as efficient as petrol yet can discharge that stored energy thousands of times (which it has to - graphene is already being sidelined into making laptop, mobile phone and car batteries orders of magnitude more efficient) - then that's pretty good going.

It's not like it's degradeable chemical storage of electrons. It's a one-molecule-thick sheet of carbon that can be charged and discharge at unbelieveable rates. It's potential is astounding.

No, its half the power efficiency of petrol. The energy density is WattHours per KG; which on that basis is much lower than petrol, which is where I came up with 305 hours to match 1KG of petrol (in an hour). As it is 40 Wh/KG for this hemp thing is anywhere from 40% to 20% of a Li-ion battery of the same mass, but the benefits as I understand it is that it would last for a shitload more charge cycles if it behaves like graphene (Li-ion batteries are supposedly good for about 400-1200 full charge cycles) and it also charges up much much faster, which is where the real win comes in.

 

[Tuthmes]

 

[old.Tohtori]

Would be a great candy, sugar covered weedleaves

 

[Job]

I thought this was going to be about the flowerpot men.

 

[Scouse]

That your back garden @Tuthmes?

 

[Tuthmes]

My sister's back garden. But it was my plant!

 

[leggy]

You had me until I saw it was a BBC article - The outfit with the most scientifically inept of all reporters. For a start they make a very bad job of distinguishing between supercapacitors and batteries which are vastly different devices with massively variable applications.

I'll hunt for an article with actual science and give my opinion (I can feel the baited breath already )

 

[fettoken]

Are you guys smoking anything nowadays? Tbh, have been passing it 9/10 times from people asking me to join. Just not any need for it, much rather have a beer or(and) five.

 

[Scouse]

Meh. Weed makes mediocrity acceptable.

I realised that when I started watching the entire series of Stargate for a second time. And quit.

 

[old.Tohtori]

Meh. Weed makes mediocrity acceptable.

The "meh" kind of kills that line

 

[Scouse]

The "meh" kind of kills that line

Must be a linguistic weedover.

 

[old.Tohtori]

Just saying that meh is something you'd more likely hear from the mouth of a pothead then a non-mediocre person of stature. Was just kind of funny

I have really little opinion on weed btw, i don't use, don't mind if people use it, legalise or don't and all that.

 

[Scouse]

Ah, that's why you didn't get the joke. I.E. the use of "meh" must be related to my previous use of weed - like a hangover that's fucked my vocab...

 

[leggy]

I used it...

The unbastardised stuff made me feel good. Everything else fucked my head right up.

Don't touch it now.

 

[old.Tohtori]

Don't touch it now.

No, it's "You can't touch this". Silly stoner