Sciencemadness Discussion Board
Not logged in [Login - Register]
Go To Bottom

Printable Version  
Author: Subject: Cheap source for platinum electrode
sternman318
Hazard to Others
***




Posts: 121
Registered: 21-4-2011
Member Is Offline

Mood: No Mood

[*] posted on 21-4-2011 at 15:00
Cheap source for platinum electrode


I am looking to synthesize sulfuric acid via the electrolysis of CuSO4, but it looks like the only viable anode for this is platinum- which obviously isn't cheap. Have you guys found any cheap sources?
View user's profile View All Posts By User
bob800
Hazard to Others
***




Posts: 236
Registered: 28-7-2010
Member Is Offline

Mood: No Mood

[*] posted on 21-4-2011 at 15:10


Carbon\graphite rods work (which you can easily extract from old dry cells), although they will quickly erode. However, the C particles don't really interfere and you can filter them out.

Here's a video using C as anode and Cu as cathode:

http://www.youtube.com/watch?v=5dUSF9Gl0xE

[Edited on 21-4-2011 by bob800]
View user's profile View All Posts By User
sternman318
Hazard to Others
***




Posts: 121
Registered: 21-4-2011
Member Is Offline

Mood: No Mood

[*] posted on 21-4-2011 at 17:00


I've got a pencil cookin' away! haha. I had seen that video ( it actually sparked this 'quest'), but had spent my time looking for platinum electrodes or other anodes, instead of just messing with an easily found one. Should I make some sulfuric acid, and dehydrate some sugar, could I not then make an electrode out of my carbon worm? Are there carbon electrodes that resist decay?
View user's profile View All Posts By User
bob800
Hazard to Others
***




Posts: 236
Registered: 28-7-2010
Member Is Offline

Mood: No Mood

[*] posted on 21-4-2011 at 17:36


Quote: Originally posted by sternman318  
could I not then make an electrode out of my carbon worm? Are there carbon electrodes that resist decay?


I think that would erode even more, but you could try it! :D There are carbon electrodes that resist decay, but they are not cheap!:o It's called "glassy carbon", and it's quite useful for these types of experiments.

Here's a thread on using glassy carbon in chlorate cells:

https://www.sciencemadness.org/whisper/viewthread.php?tid=15...

Personally, I would just use a carbon rod from a AA dry cell. I did this before and it worked fine after I filtered the carbon particles.

[Edited on 22-4-2011 by bob800]
View user's profile View All Posts By User
#maverick#
Hazard to Others
***




Posts: 209
Registered: 7-4-2011
Member Is Offline

Mood: hybridised

[*] posted on 21-4-2011 at 17:39


i have a glossy type carbon electrode that i got for free if you wanna try it, if i can find it lol

[Edited on 22-4-2011 by #maverick#]
View user's profile View All Posts By User
redox
National Hazard
****




Posts: 268
Registered: 22-2-2011
Location: The Land of Milk and Honey
Member Is Offline

Mood: Chalcogenetic

[*] posted on 21-4-2011 at 17:48


On ebay (last time I checked) there is a dealer selling lengths of platinum wire for $1.75 per inch. You would only need a few inches for your electrolysis. Check him out- his name is "mfg_answers."
View user's profile Visit user's homepage View All Posts By User
rollercoaster158
Harmless
*




Posts: 34
Registered: 21-4-2012
Location: Looking through your window
Member Is Offline

Mood: Compiling...

[*] posted on 22-4-2012 at 15:10


It may be $1.75 an inch, but the wire's .003 inches in diameter! :o
View user's profile View All Posts By User
dann2
International Hazard
*****




Posts: 1523
Registered: 31-1-2007
Member Is Offline

Mood: No Mood

[*] posted on 22-4-2012 at 17:25



A flea's dildo?
View user's profile View All Posts By User
barley81
National Hazard
****




Posts: 481
Registered: 9-5-2011
Member Is Offline

Mood: No Mood

[*] posted on 22-4-2012 at 17:26


Too big for that.
View user's profile View All Posts By User
j_sum1
Administrator
********




Posts: 4680
Registered: 4-10-2014
Location: Oz
Member Is Offline

Mood: Metastable, and that's good enough.

[*] posted on 18-12-2014 at 03:21


Has anyone had any success with Pt plated jewellery as an anode?
View user's profile View All Posts By User
WGTR
International Hazard
*****




Posts: 857
Registered: 29-9-2013
Location: Online
Member Is Offline

Mood: Outline

[*] posted on 18-12-2014 at 05:08


No, I haven't tried. But since I'm thinking about it, this is where I bought mine last time:

http://www.ebay.com/itm/1-gram-Platinum-Bar-Secondary-Market...

The key is to get them from the "secondary market". They have physical blemishes, etc. It's like junk silver, except it's platinum, and probably the closest to spot price that people can just buy. Right now they're around $50.

For the larger sizes (5g) it is probably cheaper to get them directly from Apmex:

http://www.apmex.com/product/23982/5-gram-platinum-bar-secon...

Those are around $200 right now.

PS: I know it's a 4-year-old thread.

[Edited on 12-18-2014 by WGTR]
View user's profile View All Posts By User
j_sum1
Administrator
********




Posts: 4680
Registered: 4-10-2014
Location: Oz
Member Is Offline

Mood: Metastable, and that's good enough.

[*] posted on 18-12-2014 at 06:22


I ask because I came across a Pt plated bracelet that was made of large (ugly) coin-sized discs. It was only five bucks.
The danger of course is that it would only take one blemish in the presumably thin surface (or a drill hole) to expose the substrate and then any electrolysis is effectively contaminated and the anode destroyed in short order. Still, it might be worth a try.

And, yes, I realise it is a four year old thread too. The question has come up periodically but I couldn't find a thread where someone had actually tried and reported success. If there are no responses, I might have to be the person to attempt it.

My main application is electrolysis of CuSO4 to make sulfuric acid. The carbon electrodes I have tried erode too quickly. My attempt at making a graphite substrate lead dioxide anode had a really poor surface. I must try that again some time though. I burned out a MMO anode -- I mistakenly thought it was up to the task. I was hoping not to have to shell out the dollars for Pt on titanium mesh.

I do have gold leaf however. I could lay it over a glass rod and try that. Or is Au incompatible with sulfuric acid electrolysis?
View user's profile View All Posts By User
jock88
International Hazard
*****




Posts: 505
Registered: 13-12-2012
Member Is Offline

Mood: No Mood

[*] posted on 18-12-2014 at 06:27


Has anyone tried magnetite
View user's profile View All Posts By User
TGT
Harmless
*




Posts: 46
Registered: 9-11-2014
Member Is Offline

Mood: No Mood

[*] posted on 18-12-2014 at 21:16


Anyone know if the inside platters of a hard drive are platinum plated, and if so can they be used or is the platinum plating too thin?

TGT
View user's profile View All Posts By User
froot
National Hazard
****




Posts: 347
Registered: 23-10-2003
Location: South Africa
Member Is Offline

Mood: refluxed

[*] posted on 19-12-2014 at 01:52


Drop one in HCl and see where on the platter the substrate metal reacts.



We salute the improvement of the human genome by honoring those who remove themselves from it.
Of necessity, this honor is generally bestowed posthumously. - www.darwinawards.com
View user's profile View All Posts By User

  Go To Top