Reference electrodes

Reference electrodes are widely used as for electrochemical measurements (CV, LSV, DPV, etc.) and electrochemical devices (electrochemical detectors for HPLC, electrochemical biosensor, etc.). Various kinds of them such as aqueous, nonaqueous, calomel and own-constructing types are available.

Reference Electrodes


Catalog No.
Description Length (mm) OD
(mm)
Liquid
Conjunction Tip
Internal solution
012167 RE-1B Reference electrode (Ag/AgCl) 70 6 Vycor glass 3 M NaCl
012168 RE-1S Reference electrode (Ag/AgCl) 40 4.5 Vycor glass 3 M NaCl
012169 RE-3V Reference electrode screw type (Ag/AgCl) 48 10 Vycor glass 3 M NaCl
012171 RE-7 Non Aqueous reference electrode (Ag/Ag+) 70 6 Vycor glass ACN/TBAP
012172 RE-7S Non Aqueous reference electrode (Ag/Ag+) 40 4.5 Vycor glass ACN/TBAP
012173 RE-7V Non Aqueous reference electrode screw type (Ag/Ag+) 48 10 Vycor glass ACN/TBAP
012174 RE-7VP Non Aqueous reference electrode screw type (Ag/Ag+) 48 10 Vycor glass ACN/TBAP
002058 RE-1C Reference electrode (Ag/AgCl/Saturated KCl) 90 6 Ceramic Saturated
KCl
002056 RE-2B Calomel Reference electrode 90 6 Ceramic Saturated
KCl
002057 RE-2C Reference electrode 90 6 Ceramic Saturated
K2SO4
012974 RE-6A Reference electrode for alkaline solution 90 6 Ceramic -*-


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Applications

RE-1B - Ag/Cl Reference electrode for CV
RE-1S - Ag/Cl Reference electrode for SECM
RE-1C - Ag/Cl Saturated KCl Reference electrode
RE-3V - Ag/Cl Reference electrode applied to Flow cell
RE-7 - Ag/Ag+ Reference electrode for CV of Non-Aqueous solvent
RE-7S - Ag/Ag+ Reference electrode for SECM
RE-7V - Ag/Ag+ Reference electrode applied to Flow cell
RE-2B - Available as a standard electrode of reference electrodes
RE-2C - Reference electrode free from chloride ion
RE-6A - Reference electrode for alkaline solution



Reference Electrode potentials at 25 °C

NHE (Normal Hydrogen Electrode)--------------------------------------- 0 mV
SCE (Potassium Saturated Calomel Electrode)---------------------- 241 mV
SSCE (Sodium Saturated Calomel Electrode)----------------------- 236 mV
Ag/AgCl (Saturated KCl)---------------------------------------------- 198 mV
Hg/Hg2SO4 (0.5 M H2SO4)-------------------------------------------- 682 mV

"Akira Fujishima, Masuo Aizawa, Toru Inoue, "Methods of Electrochemical Analysis (1984)" Gihodo shuppan"

RE-2C Reference Electrode [Catalog No. 002057]

Developed for the sake of eliminating any influence of chloride ion from measurements. Consists of mercury, mercury sulfate and saturated potassium sulfate solution.


Hg2SO4 + 2e = 2Hg + SO42-
E0 = 650 mV VS NHE (25 °C)
Reference Electrode RE-2C


Reference Electrode RE-2B/RE-2C/RE-1C
002056 RE-2B Calomel Reference electrode 002058 RE-1C Reference electrode (Ag/AgCl/Saturated KCl)
Hg2Cl2 + 2e = 2Hg + 2Cl-
E0 = 241 mV VS NHE (25 °C)
AgCl + e = Ag+ + Cl-
E0 = 199 mV VS NHE (25 °C)
RE-2B Calomel Reference electrode and RE-1C Reference electrode (Ag/AgCl/Saturated KCl) have the same shape as RE-2C.




Technical note

Supporting electrolyte

If the sample is dissolved in an organic solvent, the supporting electrolyte must be added.
In order to select the supporting electrolyte, it is necessary to consider the following:
1. Solubility in organic solvents
2. Wide potential window
3. No reaction with organic solvent

Typical supporting electrolyte:
TEAP: Tetraethylammonium perchlorate
TBAPF6: Tetrabutylammonium hexafluorophosphate


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