On Mar 16, 12:31*am, Phil Hobbs
wrote:
wrote:
On Mar 10, 12:34 pm, John Fields
wrote:
On Mon, 10 Mar 2008 03:20:05 -0700 (PDT),
wrote:

snip

BTW, here's an excellent link:

http://electrochem.cwru.edu/ed/encyc...electr-cap.htm

Very good indeed. I'm particularly envious of the use of electron
microscope images to illustrate what is going on at the micro level at
the electrode surfaces.

I wanted to turn an electron microscope on the platinum black we were
putting on the electrode surfaces in our conductivity cell in my last
job, but the best the boss could come up with was an obsolete Philips
machine in someone local's hobby space, operated by the owner, and he
couldn't produce any useful images.

The report does suggest that the anode and cathode foils and foil
surfaces are distinctly different, which does make it difficult to
predict what reverse electrolysis might actually do, but will - of
course - provide an endless source of explanations for the results of
your experiments.

--
Bill Sloman, Nijmegen

Bill,

Do you still have the samples? *I could use some SEM pictures of
platinum black for the second edition of my book, and I have access to a
* couple of really nice Zeiss SEMs.

Sorry, no. As far as I know Haffmans in Venlo are still making the
unit (though they weren't selling as many as they'd hoped when I was
last in contact) but I didn't take any examples home with me when I
left them - platinum is expensive stuff and the electrode assembly
(with its built-in glass bead themistor) cost quite a lot of money.

--
Bill Sloman, Nijmegen