Can the electrochemical reactivity of gases such as O2, CO2, N2 and transition metal phthalocyanines change in distilled water or phosphate buffer (pH 7)?
When a saturated solution of each gas was reacted with a metal phthalocyanine-coated carbon electrode in each solvent, the appearance of peaks changed between PBS and distilled water.
Are there any effects of solvents?
I would like you to teach me about that. Thank you.
Yes, the electrochemical reaction can change between distilled water and phosphate buffer. The type of solvent used can affect the reactivity of different species in an electrochemical reaction. This is because solvents can interact with ions or molecules in the reaction and influence their behavior.
In this case, when a saturated solution of each gas was reacted with a metal phthalocyanine-coated carbon electrode in each solvent, the appearance of peaks changed between phosphate buffer solution (PBS) and distilled water. This is due to the difference in the ionic strength and pH of the two solvents.
Phosphate buffer solution (PBS) has a pH of 7 and a specific ionic strength, which can affect the reactivity of species in the solution. Distilled water has a neutral pH but does not contain ions, which can also impact the reactivity of species in the solution.
In summary, the solvents used can have an effect on the electrochemical reactivity of gases such as O2, CO2, N2 and transition metal phthalocyanines. Different solvents can alter the reactivity of these species and result in changes in the appearance of peaks in an electrochemical reaction.
It is possible for an electrode response that should be a reduction reaction to show a peak for an oxidation reaction instead. This can be caused by a number of things, such as contamination, changes in the electrochemical environment, or mistakes in the way the experiment was set up.
For example, the electrode response can change if there are impurities in the solution that stop the reaction from happening. Changes in ionic strength, pH, or other electrochemical conditions can also change the response of an electrode.
Also, the response of the electrode could be affected by technical mistakes in the experiment, such as not cleaning the surface of the electrode well enough or problems with the equipment used to measure electrochemistry.
To figure out why an electrode didn't respond as expected, it's usually necessary to carefully look at the experiment's conditions and data and do more tests to rule out possible sources of error. You might also want to talk to an experienced electrochemist for help figuring out what the results mean.
Dear Arisa Ueda,
Sorry for the late reply: I just read your question. It is not just and perhaps not so much about changing reactivity as it is about changing the critical conditions of the electrochemical measurement.
It is not quite clear what kind of experiment you deal with, but mentioning “peaks” probably says about a voltammetric experiment. If so, you should bear in mind that a correct voltammetric measurement is impossible in distilled water and a supporting electrolyte is required. The aim of its use is to decrease the electric resistance and to eliminate the migration current contribution that is a current due to the movement of charged species in an electric field. This is achieved by addition of a neutral electrolyte in a large excess (1000 times or more) of the electroactive species concentration. The supporting electrolyte can also be a buffer (phosphate buffer) to maintain a required pH.
As for the solvent effect, it makes sense to talk about the nature of the non-aqueous solvent if it was used in your experiment.
Regards,
Rouvim Kadis
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