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Reference electrodes & porous glass frits

In electrochemistry, the most basic equipment to be able to perform your experiment is a reference electrode. A reference electrode has a fixed electrochemical potential and is used to apply a potential difference to the electrode. Depending on your electrolyte and your system, you might want to prefer using chloride-based reference electrodes (Calomel, Ag/AgCl) or sulfate-based electrodes (Hg/HgSO4). Additionally, we also offer mercury-free electrodes that follow RoHS directive and are using the Red Rod technology based on NO3 compound. The size of the cell will also influence your choice of electrode. We offer both small cell and large cell reference electrodes. Various types of porous junctions are offered depending on the type of electrode that you are interested in. Advices for maintenance are also given.

 

Small reference electrodes for aqueous media

Various electrodes are offered using either ceramics or porous glass as material for the junction.

RE-1B

RE-1B-cote

RE-1S

RE-1S-cote

RE-1CP

RE-1CP

RE-2BP

RE-2BP

RE-2CP

RE-2CP

RE-3VT

RE-3V-cote

RE-61AP

RE-6AP

Catalog No. Junction Electrolyte Purpose
RE-1B reference electrode (Ag/AgCl – length: 78mm, OD: 6 mm) A-012167 IPPG 3 M NaCl SVC-2, SVC-3, VC-4, bulk electrolysis,
RRDE-3A, flat cell
RE-1S reference electrode (Ag/AgCl – length: 52mm, OD: 4.5 mm) A-012168 IPPG 3 M NaCl SECM
RE-1CP reference electrode (Ag/AgCl – length 92mm, OD: 6mm) A-013429 Ceramics Saturated KCl SVC-2, SVC-3, VC-4, bulk electrolysis,
RRDE-3A, flat cell
RE-2BP calomel reference electrode (length: 92mm, OD: 6mm) A-013430 Ceramics Saturated KCl SVC-2, SVC-3, VC-4, bulk electrolysis,
RRDE-3A, flat cell
RE-3VT reference electrode (Ag/AgCl – screw type, poly acetal resin – length: 52mm, OD: 10mm) A-012169 Ceramics 3 M NaCl for flow cell spectroelectrochemical
cell SEC-3F
RE-2CP reference electrode (Hg/Hg sulfate – length: 92mm, OD: 6mm) A-013431 IPPG Saturated K2SO4 Free from Chloride Ion
RE-61AP reference electrode (Hg/HgO – length: 92mm, OD: 6 mm) A-013395 Ceramics 1 M NaOH For alkaline solution
Ag/AgCl ink, 2 mL A-011464 surface resistance:
0.2 Ω/sq/25.4 µm
viscosity:
50,000 ±10,000 CP @21.1 °C
flash point: 82 °C
for micro CV cell, IDA measurment

*IPPG: Ion Permeable Porous Glass

RHEK

Catalog No.
RHEK Reversible hygrogen electrode kit: A-013373
– RHE Reversible hydrogen electrode (length: 84 mm) A-013374
– RHEK accessories kit (Tubing clamp, Silicone tube, O-ring, female luer fitting, disposable syringe) A-013378

Optional

Catalog No.
Double junction chamber kit (length: 150 mm): A-013375
– Double junction chamber A-013376
– O-ring
– PTFE Cap for double junction chamber A-013377
– Pt counter electrode A-002222

 

Small reference electrodes for non-aqueous media (Ag/Ag+)

To avoid electrolyte leakage or concentration due to evaporation during storage or transport, the electrolyte is separated from the body. This gives the possibility to fill it regularly.

RE-7

RE-7-cote (1)

RE-7S

RE-7S-cote

RE-7V

RE-7V-cote

RE-7VP

RE-7VP-cote

RE-7 – Electrolyte solution (3 mL)

RE-7C

 To avoid electrolyte leakage or concentration due to evaporation during storage or transport, the electrolyte is separated from the body. This gives the possibility to fill it regularly.
Catalog No. Junction Electrolyte Purpose
RE-7 non aqueous reference electrode (Ag/Ag+ ), (length: 81mm, OD 6 mm) A-012171 vycor glass Ag/Ag+ /ACN*/TBAP** CV
RE-7S non aqueous reference electrode (Ag/Ag+ ), (length: 52 mm, OD 4.5 mm) A-012172 vycor glass Ag/Ag+ /ACN*/TBAP** SECM
RE-7V non aqueous reference electrode (Ag/Ag+ )
screw type, poly acetal resin (length: 52 mm, OD: 10 mm)
A-012173 vycor glass Ag/Ag+ /ACN*/TBAP** flow cell
RE-7VP non aqueous reference electrode (Ag/Ag+ )
screw type, PEEK resin (length: 52 mm, OD: 10 mm)
A-012174 vycor glass Ag/Ag+ /ACN*/TBAP** flow cell
* Acetonitrile
** Tetra Butyl Ammonium Perchlorate
PotentiotialsSchema

King size reference electrodes

When using larger cells, you might want to use larger electrodes.

R-XR820

1

R-XR300

R-XR300

R-XR110

R-XR440

Catalog No. Junction Electrolyte Purpose
Ag/AgCl reference electrode length 120 mm, OD 8 mm R-XR300 ceramic sat KCl CV
length 160 mm, OD 8 mm R-XR820 ceramic sat KCl EIS
Calomel reference electrode length 120 mm, OD 8 mm R-XR110 ceramic sat KCl CV
Red Rod reference electrode length 120 mm, OD 8 mm R-XR440 ceramic 1M KNO3 CV
Options
Short connection cable for screw cap electrode length 10 cm with 2 mm male banana plug R-A94L111*
Cable connection for Screw cap Electrode (1 m – 4 mm banana plug) R-CL111*
12 mm OD conical rings for 8 mm OD electrodes (4 pieces) R-X31M012
Bridge tube with ceramic junction length: 70 mm, OD 12 mm R-AL100
length: 250 mm, OD 8 mm R-AL110
with reverse sleeve (non aqueous) length: 138 mm, OD 8 mm R-AL210
length: 138 mm, OD 8 mm R-AL120
* R-A94L111, R-CL111 or R-CRI9439 connectors are strongly recommended to connect these reference electrodes to the potentiostat

Maintenance of small reference electrodes

Firstly, when it is not in use, the recommended way to maintain the reference electrode capability and lifetime, is to keep it in a sealed preservative vial with a solution. This storage solution should be identical to the filling solution of the reference electrode.

SecondIy, it is also important to replace the porous glass frit when needed. A Yellowish discoloration can indicate contamination, caused by the adsorption of organic compounds into their pores.

Thirdly, to prevent the contamination of the electrode itself, it is recommended to use a new sample holder when necessary.

 

 

 

 

 

 

a-012108_150-cmjn

Catalog No.
RE-PV preservative vial for reference electrode, 10 mL A-012108
Contents
PTFE cap for RE-PV
Screw vial 10 mL
Option
RE-7 electrolyte solution 10 mL A-012549

Replace the porous glass frit when needed

Yellowish discoloration indicates contamination.
This is caused by the adsorption of organic compounds into their pores.
Catalog No.
Repair kit for sample holder A-012796
Set of 10 porous glass frits diameter 2.8 mm (CoralPor*) + heat shrink PTFE (20 cm) 092-VYC3**
Set of 10 porous glass frits diameter 4 mm (CoralPor*) + heat shrink PTFE (20 cm) 092-VYC4***
*CoralPorTM is a porous glass frit like Vycor.- specific surface area 212 m2/g- pore diameter 7.8 nm- pore volume 0.21 cc/g
** 092-VYC3 for the reference electrodes : A-012167 ; A-012168 ; A-012171 ; A-012172 and for the bridge tube A-012176.
*** 092-VYC4 for the bridge tubes: EL-C-008 ; EL-A-008, EL-F-004, EL-F-004B, EL-C-017 ; EL-A-017.

Prevent contamination

A-012177
To prevent contamination of the reference electrode, a sample holder can be used.
Catalog No.
Bridge tube Ø 9.0 mm (2 pieces) A-012177
Bridge tube Ø 9.0 mm (22 pieces) A-012307