Hydrogen Creation
Gitch, Thu Feb 23 2006, 02:45AMI know it used to be on the old site, but I can't find it
What is the optimum voltage to create Hydrogen?? And it comes off the positive terminal doesn't it??
Cheers
Re: Hydrogen Creation
Carbon_Rod, Thu Feb 23 2006, 06:09AM
Google-fu :
"hydrogen half cell reaction theory"
Then:
"overvoltage hydrogen Electrolysis production fair"
Cut and paste if typing is too difficult for you... or click... =P
Carbon_Rod, Thu Feb 23 2006, 06:09AM
Google-fu :
"hydrogen half cell reaction theory"
Then:
"overvoltage hydrogen Electrolysis production fair"
Cut and paste if typing is too difficult for you... or click... =P
Re: Hydrogen Creation
Omicron, Sun Feb 26 2006, 02:32AM
Try a Lye water solution or use HCl and aluminum to make hydrogen, I suggest the lye more though.
Omicron, Sun Feb 26 2006, 02:32AM
Try a Lye water solution or use HCl and aluminum to make hydrogen, I suggest the lye more though.
Re: Hydrogen Creation
vasil, Sun Feb 26 2006, 08:11PM
H+ neutralise at cathode (-).
More H2 can be obtained through chemical reaction than through electrolisis (eg: Al + NaOH)
vasil, Sun Feb 26 2006, 08:11PM
H+ neutralise at cathode (-).
More H2 can be obtained through chemical reaction than through electrolisis (eg: Al + NaOH)
Re: Hydrogen Creation
the_anomaly, Sun Feb 26 2006, 08:29PM
If you do electrolysis with salt above somewhere around 13volts and chlorine will come off the anode. I think sulfuric acid is the best for electrolysis. For a controllable reaction that has no toxic gasses citric acid and zinc work great with a catalyst of copper sulfate. HCL is a fuming acid and with Al will produce some toxic fumes with hydrogen.
the_anomaly, Sun Feb 26 2006, 08:29PM
If you do electrolysis with salt above somewhere around 13volts and chlorine will come off the anode. I think sulfuric acid is the best for electrolysis. For a controllable reaction that has no toxic gasses citric acid and zinc work great with a catalyst of copper sulfate. HCL is a fuming acid and with Al will produce some toxic fumes with hydrogen.
Re: Hydrogen Creation
Chris, Sat Mar 04 2006, 01:01AM
Not hardly, if you're talking cost per mole of hydrogen. HCl can easily cost nearly $0.20 per mole at the hardware store, and scrap aluminum about $0.05 per mole. So for $1 you can get barely 2 moles of H2 gas that way (that's only 4g, about 44.5L or 1.6 cubic feet), and some AlCl3 as well. For that same dollar in electricity (assuming no electrolyte is consumed too), about 20kWh (72MJ), 4000Ah or 149 faradays at 5V, you can get about 75 moles (over 1600L or 58 cubic feet) of H2 gas. Optimum voltage to do it will be about 2.5V in a well designed system with low cell resistance (see the electrode potentials which total about 2V, in the reaction on wikipedia), so it's actually even more economical than that. Production from catalyzing natural gas must be even cheaper yet (I'm not even going to bother to calculate), since that's how hydrogen is produced industrially.
Chris, Sat Mar 04 2006, 01:01AM
More H2 can be obtained through chemical reaction than through electrolisis (eg: Al + NaOH)
Not hardly, if you're talking cost per mole of hydrogen. HCl can easily cost nearly $0.20 per mole at the hardware store, and scrap aluminum about $0.05 per mole. So for $1 you can get barely 2 moles of H2 gas that way (that's only 4g, about 44.5L or 1.6 cubic feet), and some AlCl3 as well. For that same dollar in electricity (assuming no electrolyte is consumed too), about 20kWh (72MJ), 4000Ah or 149 faradays at 5V, you can get about 75 moles (over 1600L or 58 cubic feet) of H2 gas. Optimum voltage to do it will be about 2.5V in a well designed system with low cell resistance (see the electrode potentials which total about 2V, in the reaction on wikipedia), so it's actually even more economical than that. Production from catalyzing natural gas must be even cheaper yet (I'm not even going to bother to calculate), since that's how hydrogen is produced industrially.
Re: Hydrogen Creation
Omicron, Sun Apr 02 2006, 04:05AM
When I need hydrogen I use lye and Aluminum with I bit of soap on top to collect it.
Omicron, Sun Apr 02 2006, 04:05AM
When I need hydrogen I use lye and Aluminum with I bit of soap on top to collect it.
Re: Hydrogen Creation
cbfull, Sat May 20 2006, 05:54PM
Just in case this thread is not totally dead, you might be able to find some of those old military canisters of calcium hydride on ebay. All you have to do is punch holes in the top of the can and drop it in a bucket of water (well, if you are filling a weather balloon).
I don't know how easy it is to handle if you were to open the can and use a little at a time. I suppose it's no big deal as long as you wear gloves, goggles and never use it in enclosed spaces. Hydrogen has no smell so you wouldn't know if it was building up in a room.
Let me know if you like this route.
cbfull, Sat May 20 2006, 05:54PM
Just in case this thread is not totally dead, you might be able to find some of those old military canisters of calcium hydride on ebay. All you have to do is punch holes in the top of the can and drop it in a bucket of water (well, if you are filling a weather balloon).
I don't know how easy it is to handle if you were to open the can and use a little at a time. I suppose it's no big deal as long as you wear gloves, goggles and never use it in enclosed spaces. Hydrogen has no smell so you wouldn't know if it was building up in a room.
Let me know if you like this route.
Re: Hydrogen Creation
Electroholic, Sat May 20 2006, 07:10PM
just becareful when you play with H- ions
Electroholic, Sat May 20 2006, 07:10PM
just becareful when you play with H- ions
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