I intend to work on a 3-electrode system in microscale. I need to understand the benefits for AgCl in Reference Electrode than other materials.
Hi Musa Ibne Mannan
When you say you will be working at the microscale, does this mean you will you still be using a standard Ag/AgCl RE, or are you planning to use a Ag/AgCl wire RE?
Musa Ibne Mannan in 3 electrode system is used non-aq. Ag/Ag+, Hg/Hg2Cl2, Hg/Hg2+ etc. What benefits do you want to hear?
Dear Musa Ibne Mannan , I think this is because it is easy to make ? Also most aqueous electrolytes use Cl- as supporting salt, and Ag/AgCl is compatible with those electrolytes.
Best regards,
Nicolas
The Ag/AgCl electrode has indeed a number of advantages which made it probably the most commonly used reference electrode (regardless of whether a 3-electrode or 2-electrode system is used in a voltammetric experiment). These advantages include:
1) compactness – this can be made in a very small size, specifically, to be used in microsystems;
2) a wide temperature range (another reference system, the Hg/Hg2Cl2 (calomel) electrode, can be used only at temperatures no higher than 60–70 °C);
3) possibility to use in some cases directly in the solution to be analyzed, which avoids the uncertainties in the potential associated with a liquid junction;
4) ability to operate in any orientation.
The properties and applications of the Ag/AgCl reference electrode have been studied comprehensively. See, e.g., Reference Electrodes for Aqueous Solutions. In: Handbook of Reference Electrodes, G. Inzelt et al. (eds). Springer, 2013. Ch. 5.
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