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September 12, 2005

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Engineer-Poet

Metallic zinc works fine in zinc-air fuel cells, which appear to be cheap and reliable.  Converting zinc to hydrogen requires hydrogen storage (getting easier but still troublesome) and PEM fuel cells (expensive and short lifespans).  Why bother with hydrogen if you're making zinc anyway?

Engineer-Poet

I did some further calculations after someone e-mailed me about this same story on another site (which does not allow open comments).

The delta Hf of zinc oxide from solid zinc is 84670 cal/mol; the delta Hf of water is 70600 cal/mol, so the conversion from metallic zinc to hydrogen is about 83% efficient. PEM fuel cells are roughly 60% efficient, so the overall efficiency of the zinc-hydrogen-PEM FC system is just about 50%.

According to Electric Fuel's published figures for their electric bus system, the efficiency of a zinc-air FC is about 62%. That's 24% more energy out of a given amount of zinc than you get by taking a detour through hydrogen.

Hydrogen is a boondoggle.

(I'd use Greek characters here, but attempts to insert the delta character are censored by Moveable Type.  Even escaped ampersands are censored!)

JesseJenkins

I think you are probably right here E-P. Whats the point of yet another conversion step when you can simply use zinc-air fuel cells?

ali maksoud

I need mor iformation about The production of hydrogen by solar twoer

husky air compressor

I'm working on a green house project. I'm really interested by this Solar Refined Zinc Enables New Hydrogen Process technolgy and I really would like to know if it's reliable for single housing application.
thanks a lot!
Husky air compressor
Husky air compressor tools

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