Electrochemical Stability of Aqueous Electrolytes
Carbon_Rod, Tue Oct 29 2013, 07:13AMI 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
Re: Electrochemical Stability of Aqueous Electrolytes
Ash Small, Tue Oct 29 2013, 09:44AM
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?
Ash Small, Tue Oct 29 2013, 09:44AM
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?
Re: Electrochemical Stability of Aqueous Electrolytes
Andy, Tue Oct 29 2013, 06:41PM
You could try oleic acid, its polar and will work with salts, not sure about the 2.4volts thought, what do you mean?
Andy, Tue Oct 29 2013, 06:41PM
You could try oleic acid, its polar and will work with salts, not sure about the 2.4volts thought, what do you mean?
Re: Electrochemical Stability of Aqueous Electrolytes
Ash Small, Tue Oct 29 2013, 08:17PM
I assume that 2.4V is the potential required for electrolysis of water, but I've not checked.
Ash Small, Tue Oct 29 2013, 08:17PM
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?
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.
Re: Electrochemical Stability of Aqueous Electrolytes
the_anomaly, Wed Oct 30 2013, 01:16AM
According to Wikipedia:
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.
the_anomaly, Wed Oct 30 2013, 01:16AM
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 (8.9×1023 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 I×(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.
Re: Electrochemical Stability of Aqueous Electrolytes
Carbon_Rod, Wed Oct 30 2013, 02:39AM
@the_anomaly
Indeed, we are seeking a stable fluid that will not undergo electrolysis, break down, and enter a gaseous phase.
Carbon_Rod, Wed Oct 30 2013, 02:39AM
@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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