John Woolsey wrote:

> I am interested in looking into the current techniques for producing 
> hydrogen.

    The technology is, for the most part, old, well understood and 
expensive!

> What is considered most efficient.

    Electrolysis is endothermic at voltages below 1.3 per cell, so it's 
possible to be more than 100% efficient if you're only counting 
electrons.  However, at voltages that low, output is very small.  As is 
the case with so much technology, compromises on cost and efficiency 
determine what is affordable and practical.  I have built a few 
electrolyzers in my day.  None of these has cost a lot of money, but 
neither were any of them better than about 25% efficient overall.  I 
haven't wasted any more time with electrolysis as a result.

> Is it more efficient at higher pressures?

    Yes.  High temperatures make electrolysis more efficient, too.  But 
high temperatures and pressures quickly increase the cost of component 
materials.

> Is the best way reversing a fuel cell?

    Fuel cells are a pipe dream right now.

> Electrolyzing water? Are there any good web sites on this?


    Here are some places to start:

            http://www.clean-air.org/

                This is Roy McAlister's organization.  Once upon a time 
I was an AHA member, I've met and interacted with Mr. McAlister and will 
vouch for his integrity.  That's not much of a complement in a field 
full of liars, but he IS an honest man.

             http://www.ush2.com/

                The U.S. Hydrogen people get a lot of their info from AHA.

             http://www.stuartenergy.com/

                A commercial site.  I've been on their "waiting list" 
for a home refueling appliance for many years.  I'm STILL waiting!

          http://www.ergenics.com/

                This is a hydride site.  I think the company is legit, 
but you'll need Prozak once you uncover the cost of activated hydride. . .

         
          http://www.hydrogenappliances.com/hydrogengeneration.html

                Read everything on this site with a BIG grain of salt.  
The company address is simply a postal box in a Lancaster, California 
strip mall.  The 'net is full of info like this.  Beware!

> Are there filters for hydrogen gas like there are for helium where you 
> can pump enough air through and extract hydrogen gas?

    I don't think so.  You can ferment hydrogen in an airless tank if 
you feed sugar to methanogenic bacteria.  I've done this, and if you 
have a free heat source and access to incredibly cheap sugar it might be 
worth pursuing.  (But why, when ethanol is so easily fermented from the 
same feed stock?)  Algae is supposed to be another biological hydrogen 
source, but I don't think your neighbors will appreciate a swimming pool 
full of slime across their backyard fence. . .  Biomass gasification is 
another option worth considering.

robert luis rabello
"The Edge of Justice"
Adventure for Your Mind
http://www.authorhouse.com/BookStore/ItemDetail.aspx?bookid=9782>




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