Natural Science Forum / Chemistry / Electrochemistry / August 2005

Here's an article:
http://www.physorg.com/news5994.html
Apaprently, triazole may allow for fuel cells to run at higher temps
and higher efficiencies, because of its better high-temperature

Just wondering if someone in the group can explain the purpose of the
Float-Equalize settings on industrial battery chargers...also...is this used
on both large Lead Acid batteries and large NiCad batteries?
TIA

I was performing an electrolysis experiment using a salt water
electrolyte, copper cathode, and an aluminium anode. I got this strange
black purplish percipitate. I have no idea what it is. If you could
help me, that'd be great.

Some small changes to "Simulating electrochemical reactions with
Mathematica" (SERM) have been made. These are mostly typographical
corrections and changes to the stylesheets. A notebook has also been
included that compares the Thomas algorithm to the sparse matrix solver that

I am designing a consumer product and currently I am thinking of using
2 AA cells, either NiMH or NiCD or Alkaline chemistry, somewhere in
the range of 500-1000mAH capacity.  Since I am fairly new to battery
chemistries & specifications, I was wondering if any of the product

Are these batteries still being sold?  I used to buy Renewals, but
then started using NI-MH because they recharge more.  Is there any
reason to use Renewals anymore?  

Are there any advantages of NI-CD over NI-MH, besides price?

I have been conducting some test on dendrite growth on gold plated
copper (with nickel barrier) printed circuit board pads.
After applying a small quantity of water and biasing with 15v I
observed a dendrite emanating from the cathode.  From the literature I

The lithium batteries used in modern equipement such as laptops,
portable gaming systems, mobile phones etc - I was wondering if they
all use the same type of lithium battery or a variety of sub categories
of lithium battery? (e.g. with different electrolytes etc).

Anyone know of an effective method of  rejuvenating nicd batteries and
battery packs for power tools? I've heard that  4 or 5 charging and draining
cycles can bring them back to life. Many of my tools are used sporadically
and I find the batteries don't hold a charge for as long ...

I am getting ready to do some corrosion resistance measurements and
having been reading up on the electrochemistry involved.
I have a very basic question that I have been trying to understand.
What is exactly solution resistance?

I've just built a 2 cell charger using a BQ2057 i.c. I'm monitoring the
charge characteristics very closely for the first few times. I'm charging a
800mAh battery with a current of 400mA (at the constant current part of the
curve). How long should I expect it to remain at this ...

I am using AA NiMH batteries in battery holders with the MAHA C-777
charger.  Often, the charger complete a charge but the battery pack
gives out after a few minutes, whereas it ought to last hours.
When I test the pack, I usually find that one cell is depleted and the

I have three identical 7.2V/800mAh Li-ion batteries that were used in
some sort of bar code scanner. I also have a charger (only one) for
that type of
battery and it puts out 200mAh. The way I use the three batteries is in

I've got a dead 12V lead-acid gel-cell battery and read all the stuff
about desulfation online.  At school, we have all sorts of fancy
programmable pulse generators, oscilloscopes made by Agilent, HP, etc.
Does anyone know how to use these devices to desulfate a lead-acid