Natural Science Forum / Chemistry / Electrochemistry / July 2004

Hi, All;
I have a project where a part made out of aluminum is to be screwed
into a  part out of copper. I don't see any problem but others tell
me there could be some sort of galvanic corrosion.

   Could anyone help.  I am trying to find either a circuit or a piece of
equipment for a pre amp.
It needs to have a flat response from 0.1Hz to 2MHz (without switching in
diff. comps.) and capable of an input imp. of 100MR and able to deal with an

Sub-C cells are the standard for NiCd and NiMH power tool battery packs. As
voltages grow, so does pack size.
At some point, the pack size curve will reach a point where the tool will be
too heavy for all but the most macho professional construction / repair /

I know it's available on Amazon, but if someone has a copy to give away to a
truly interested student of battery applications...
Thanks,

Is there, by any chance, a way to make a battery out of human poop?

What is the current and projected eventual (with mass production, cost
improvements, etc.) of lithium ion?
Is $100/kwh possible?
Also is there a potential to increase deep cycles from 300 to 3000

I read on web that one Finland firm patented rechargable Aluminium/Air
technology with energy density 1.3kWh/ kg in 2002. Does anyone know
something about it?
Uros

The recommended battery change interval for UPS is typically 3 to 5
years.  When I got a UPS used, it came with a battery from Dec 2001,
pretty much dead.  I searched around for a bit and I guess after a few

I am looking to generate Co2 via some way of electrolysis.
Oxalic acid seems to be a good source, where it is electrolyzied in
solution across a semi permiable membrane. Co2 Should be emitted on
the anode, and hydrogen on the cathode. I do not know if this will

I've recently been trying to make lead dioxide anodes by electrolyzing a
solution
containing 200 g/L lead nitrate, 5 g/L copper nitrate and 20 mL/L 65% nitric
acid. With a graphite anode and a copper cathode the lead dioxide plates

I've heard so many different stories regarding battery memory that I'm
never sure what to believe.  (NiMH was supposed to solve this at one
point, right?)
Anyway, in regard to Li Ion batteries, specifically those for laptops:

I wish to comment on
27.04.2003-02.05.2003
The presentation "EChem++ - An Object Oriented Approach to
Computational Electrochemistry" was given at the 203rd Meeting of the

Hi,
I hope someone can help me out. I'm trying to use electrolysis for
removing rust from classic car parts.
I have been told that I can use a PC power supply as my power source.

bought some Energizer Rechargable C batteries for my cycle lights and
they were crap, really crap they kept letting me down, I soon found
out some facts.
C and D size batteries only tend to have a slightly better MaH

can someone tell me what the maH(or equivalent) of the duracell AA and AA ultra are?