Reference Electrodes

Materials and Shapes of REs for each application

Optimizing your Electrochemical Research

The reference of the potential in electrochemical measurement is based on the reference electrode, so it is a very important electrode. SFTec provides a wide line of reference electrodes, as reference electrode for measurement in aqueous solution, non-aqueous solution, alkaline solution, and reversible hydrogen electrode compatible with most of potentiostats and other accessories for electrochemical testing.

Our electrodes are characterized by their conventional design, chemical stability, specific features catering to different detection needs and a right price.

SFTec wide range of REs include:

Aqueous reference electrodes (Ag/AgCl type)
Non Aqueous reference electrodes (• Ag/Ag+ type)
Calomel Standard reference electrode
Reference electrode for alkaline solution
Reversible Hydrogen Electrode

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Range of Reference Electrodes

Reference electrode for Aqueous solution (Ag/AgCl type)

Features:

Ag/AgCl type
Electrolyte: 3M NaCl or KCl
Isolation Material: hard glass or polymethylpentene
Junction: IPPG or ceramics
For application in aqueous solutions
Relatively long life time

Catalog No.	Description	Junction	Electrolyte	Isolation	OD	L
ALS 012167	RE-1B Reference electrode (Ag/AgCl)	IPPG	3 M NaCl	Glass	6 mm	78 mm
ALS 013613	RE-1BP Reference electrode (Ag/AgCl)	Ceramics	3 M NaCl	Polymethyl pentene	6 mm	90 mm
ALS 013393	RE-1S Reference electrode (Ag/AgCl)	IPPG	3 M NaCl	Glass	4.5 mm	52 mm
ALS 013691	RE-1CP Reference electrode (Ag/AgCl/Saturated KCl)	Ceramics	saturated KCl	Polymethyl pentene	6 mm	92 mm
ALS 013488	RE-3VT Reference electrode screw type (Ag/AgCl)	Ceramics	3 M NaCl	Polymethyl pentene	10 mm	52 mm
AIDA R0302	Silver-silver chloride electrode R0302	IPPGC	3.5M KCl (not included)	Glass	4.0mm	50mm
AIDA R0302	Silver-silver chloride electrode R0303	IPPGC	3.5M KCl (not included)	Glass	6.0mm	50mm
AIDA R0305	Reference electrode (Ag/AgCl/KCl)	IPPG	Saturated KCl (not included)	Glass	6.0mm	80mm

Reference electrode for Aqueous solution (Hg type)

Features:

Saturated Calomel Electrode type (standar) or Hg/HgO/OH (alkaline solutions)
Polymethylpentene (high chemical resistance) or glass body.
Reference electrodes used for the reference potential measurement of the electrodes in electrochemical research.

Catalog No.	Description	Junction	Electrolyte	Isolation	OD	L
ALS 013693	RE-2BP Calomel reference electrode	Ceramics	saturated KCl	Polymethyl pentene	6 mm	92 mm
ALS 013692	RE-2CP Reference electrode	Ceramics	saturated K2SO4	Polymethyl pentene	6 mm	92 mm
ALS 013694	RE-61AP Reference electrode	Ceramics	--	Polymethyl pentene	6 mm	92 mm
AIDA R0232	R0232 Standard calomel electrode	Ceramics	saturated KCl	Hard Glass	9 mm	85 mm
AIDA R0401	R0401 Mercury-Mercurous Sulfate	Ceramics	saturated K2SO4	Hard Glass	9 mm	85 mm
AIDA R0501	Mercury oxide electrode R0501	Ceramics		Hard Glass	9 mm	85 mm

Reference electrode for Aqueous solution (Hg type)

Features:

Ag/Ag+ type
For application in an organic solvent samples
Internal solution changeable

Catalog No.	Description	Junction	Isolation	OD	L
ALS 013848	RE-7N Non Aqueous reference electrode	IPPG	Hard Glass	6 mm	68 mm
ALS 013849	RE-7SN Non Aqueous reference electrode	IPPG	Hard Glass	6 mm	40 mm
ALS 013850	RE-7VN Non Aqueous reference electrode screw type	Ceramics	Polymethyl pentene	6 mm	30 mm
AIDA R0201	R0201 Non Aqueous reference electrode	IPPG	Hard Glass	4 mm	50 mm
AIDA R0202	R0202 Non Aqueous reference electrode	IPPG	Hard Glass	6 mm	50 mm

∗ IPPG: Ion Permeability Porous Glass

ALS Reversible Hydrogen Electrode kit

Features:

Reversible hydrogen electrode that achieves good potential stability as a reference electrode for electrochemical measurements by generating and capturing hydrogen gas through electrolysis of an acidic solution.
It makes unnecessary the complicated and dangerous set-up of the hydrogen cylinder and avoids the large volume of hydrogen gas exhaustion, even though it has a good potential stability.
By using a double junction chamber, the electrode can be used with solutions other than acidic solutions.
H2G1 Portable Hydrogen Generator, which can be easily filled with hydrogen gas without a potentiostat, is also available.

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The Reversible hydrogen electrode (RHE) kit can be used without Double junction chamber when strong acid (<pH 2, such as 0.5 mol/L sulfuric acid) is used as an electrolyte solution.

Catalog No.	Description	Qty.
ALS 013597	RHEK Reversible hydrogen electrode kit	1

Content of the kit:

Catalog No.	Description	Qty.
ALS 013598	RHE Reversible hydrogen electrode	1
ALS 013378	RHEK accessories kit: Tubing clamp (x1) Silicone tube (10 cm) (x3) O-ring (x1) Female lure fitting (x1) Disposable syringe (x1)	1

Double junction chamber kit

The Double junction chamber kit is used when the electrolyte solution is a weak acid, neutral solution, solution containing scum etc.

Catalog No.	Description	Qty.
ALS 013375	Double junction chamber kit	1

Content of the kit:

Catalog No.	Description	Qty.
ALS 013376	Double junction chamber	1
ALS 013377	PTFE Cap for double junction chamber	1
ALS 002222	Platinum counter electrode 5.7 cm	1
	O-ring	1

Gaskatel Hydrogen Reference electrode for Non Aqueous solution (Ag/Ag+ type)

Features:

Made entirely from plastic.
Robust and insensitive to breakage.
Recommended for highly concentrated alkaline solutions / concentrated acids, even in hydrofluoric acid or fluoride-containing media.
Free of mercury and silver.

Catalog No.	Description	Junction	Isolation	OD	L
GASKATEL 81010	Hydrogen reference electrode HydroFlex Starter Kit	IPPG	Glass	6 mm	68 mm
GASKATEL 81010	HydroFlex – platinum-hydrogen reference electrode	IPPG	Glass	6 mm	40 mm
GASKATEL 81010	RE-7VN Non Aqueous reference electrode screw type	Ceramics	Polymethylpentene	6 mm	30 mm

∗ IPPG: Ion Permeability Porous Glass

Reference Electrode Selection

Reference electrode selection by pH of the sample

The pH of the sample has a major influence on electrochemical measurements, as it directly affects reaction kinetics, thermodynamics, and the state of the electrode surface. It also limits the use of certain reference electrodes, such as glass-based electrodes, in alkaline solutions.

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