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'[EE]: [OT]: hydrogen/aluminium ...Zink alternative'
2002\09\18@072624 by Morgan Olsson

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Hej Roman Black. Tack för ditt meddelande 10:34 2002-09-18 enligt nedan:
>Also-Antal Csaba wrote:
>A very interesting way of producing hydrogen! :o)
>Bear in mind that hydrogen burnt in air is NOT a pollution
>free fuel like hyd/oxy mix is. :o)

Exactly, since the combustion temperature is so high that N is being oxidized to NOx.

Fuel cell is OK though.

>I did some research a few years back re using aluminium
>as a fuel, and it is quite feasable depending on the
>relative cost of alternative fuels. Australia is a large
>producer of aluminium and it has a fairly low cost here,
>in fact about 70% of the cost of the aluminium is the
>energy needed to convert it from aluminium oxide to
>pure aluminium, and when burnt or oxidised back to the
>oxide form it can release a lot of energy.

Yes...  a similar idea being used plenty in small scale (hearing aid etc) and is tried also in vehicles is Zinc-air batteries.

Let zinc oxidize from air at *normal temperature*, and you get electricity.
I saw pictures of a zinc driven car.  Place zinc plates in buckets, and when there is only Zinc Oxide left then exchange for new plates. (well of course there is also some negative plate and some kind of electrolyte in sheet form IIRC.)

If it shall be commercial it needs to be automatized, maybe automatically exchanged from bottom of car while we put the pay card into the automat through the window.  Faster than fueling :)

The zinc oxide is electrolytically transformed back to Zinc (and oxygen) in similar way as Alumina is produced (melt, high temperature).  If that recycler is intelligently located both oxygen and waste heat can be used = high total efficiency.

Zinc-air batteries have VERY high energy/volume and low weight.
One problem is it can only deliver energy at a low rate, so for vehicles it needs to have an accumulator (NiMH, or in future probably Lithium polymer)

Zinc-air cars will probably very safe, as Zinc-air can not produce high instantaneous power, is not very poisonous, is not high temperature, nothigh pressure, and is not combustible @ normal conditions.

It is also pretty low tech.  Only problem is the needed ZincOxide recycler sites, but that is easier than oil crackers and refineries, so...


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