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Electrochemical Stability of Aqueous Electrolytes

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LAN_403

Carbon_Rod

Tue Oct 29 2013, 07:13AM

Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155

I read this paper,

and was curious if anyone knows of stable (nontoxic/safe-pH) aqueous electrolytes that can withstand over 2.4 V.

Cheers,
Rod

Ash Small

Tue Oct 29 2013, 09:44AM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

I've not read the full paper, and I'm not sure I fully understand the question, but if you're after organic compounds for electrolytes there are two that spring to mind, ethylene glycol (antifreeze) and glycerol (glycerine).

Glycerol is non-toxic, and I've used it as an electrolyte, with about 10% water added (You apparently require some water), along with the acid (the amount of acid added isn't critical, 10% to over 50%, depending on the application).

I'm not sure if this is relevant to your application. Maybe I should read the paper in full?

Andy

Tue Oct 29 2013, 06:41PM

Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874

You could try oleic acid, its polar and will work with salts, not sure about the 2.4volts thought, what do you mean?

Ash Small

Tue Oct 29 2013, 08:17PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

Andy wrote ...

You could try oleic acid, its polar and will work with salts, not sure about the 2.4volts thought, what do you mean?

I assume that 2.4V is the potential required for electrolysis of water, but I've not checked.

the_anomaly

Wed Oct 30 2013, 01:16AM

Registered Member #19 Joined: Thu Feb 02 2006, 03:19PM
Location: Jacksonville, FL
Posts: 168

According to Wikipedia:

The electrolysis of water requires a minimum of 286 kJ of electrical energy input to dissociate each mole. Since each mole of water requires two moles of electrons, the specific electrical energy required is 143 kJ/mole (8.9Ã—1023 eV/mole). It follows then that a minimum electrical power input per ampere is implied, namely 1.48 W/ampere. In turn, the minimum electrolytic potential for electrolysis of water of 1.48 V (not 1.23 V). Thus, any current (I) at applied voltage (V) greater than 1.48 V is an overvoltage and results in waste heat which can be estimated as IÃ—(V-1.48).

Its 1.48V for electrolysis of water (I believe the paper stated 1.23V but that was besides my point). I believe Carbon_Rod was interested in an electrolyte which does not begin to breakdown or release energy as heat past applying 2.4V to the cell. I can only think of solid electrolytes that are good for higher cell voltage.

Carbon_Rod

Wed Oct 30 2013, 02:39AM

Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155

@the_anomaly
Indeed, we are seeking a stable fluid that will not undergo electrolysis, break down, and enter a gaseous phase.

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