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Forum index » Science and Technology » Chem » Electrochem
Two Platinum Electrodes having Potential Difference
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attarchi@gmail.com
science forum beginner


Joined: 02 Jun 2006
Posts: 1

PostPosted: Fri Jun 02, 2006 2:09 pm    Post subject: Re: Two Platinum Electrodes having Potential Difference Reply with quote

nfornauman@gmail.com wrote:
Quote:
I use Potentiodynamic polarisation scan using Saturated Calomel as
Reference and Platinum electrode as Counter electrode. Platinum
Electrode is a 1cm by 1cm flag type. A few months ago, I started
getting unusual results, and while trying to locate problem, I found
that my two platinum electrode give a potential difference against
other (open circuit, just the two platinum electrode in electrolyte).
This potential difference is not stable, varies continuously between
-300mV to +300mV. What is wrong here? I have checked they are not
leaking. Do I need Platinum Electrode cleaning, and how can I clean
them?

Nauman

Answer:
you can use acidic solution to cleaning.
this manner is usual and u can check the potential of each platinum
electrode vr. one corroding electrode in saturated solution. you see
this manner, because the solution resistance is high and corrosion
current is low . if you want i can describe this manner.
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ketjow
science forum beginner


Joined: 07 Jun 2005
Posts: 6

PostPosted: Wed May 31, 2006 10:45 pm    Post subject: Re: Two Platinum Electrodes having Potential Difference Reply with quote

Quote:
This potential difference is not stable, varies continuously between
-300mV to +300mV. What is wrong here?

Are you sure the same processes occur at both Pt electrodes?

Pt is excellent polarizable electrode - it hasn't got its own constant
potential, it is strongly depend on the electrolyte conditions.

Quote:
Do I need Platinum Electrode cleaning, and how can I clean
them?

You can use annealing Pt in gas flame (propane-butane).

Put it in reducing and then oxidizing flame but I have to admin I'm not sure
it's right sequence. Does anybody know the true?


- ketjow
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Dieter Britz
science forum beginner


Joined: 04 May 2005
Posts: 45

PostPosted: Wed May 31, 2006 8:18 am    Post subject: Re: Two Platinum Electrodes having Potential Difference Reply with quote

nfornauman@gmail.com wrote:

Quote:
I use Potentiodynamic polarisation scan using Saturated Calomel as
Reference and Platinum electrode as Counter electrode. Platinum
Electrode is a 1cm by 1cm flag type. A few months ago, I started
getting unusual results, and while trying to locate problem, I found
that my two platinum electrode give a potential difference against
other (open circuit, just the two platinum electrode in electrolyte).
This potential difference is not stable, varies continuously between
-300mV to +300mV. What is wrong here? I have checked they are not
leaking. Do I need Platinum Electrode cleaning, and how can I clean
them?

You'd have to tell us a bit more about the cell, such
as, what is the electrolyte, what else is in it, what
are the conditions, etc. But cleaning Pt is easy, it
being a noble metal. You can just dip it into strong
acid, rinse it, and Bob's your uncle.
--
Dieter Britz, Kemisk Institut, Aarhus Universitet
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nfornauman@gmail.com
science forum beginner


Joined: 28 May 2006
Posts: 3

PostPosted: Tue May 30, 2006 10:52 am    Post subject: Two Platinum Electrodes having Potential Difference Reply with quote

I use Potentiodynamic polarisation scan using Saturated Calomel as
Reference and Platinum electrode as Counter electrode. Platinum
Electrode is a 1cm by 1cm flag type. A few months ago, I started
getting unusual results, and while trying to locate problem, I found
that my two platinum electrode give a potential difference against
other (open circuit, just the two platinum electrode in electrolyte).
This potential difference is not stable, varies continuously between
-300mV to +300mV. What is wrong here? I have checked they are not
leaking. Do I need Platinum Electrode cleaning, and how can I clean
them?

Nauman
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