The active tip of the electrode is a flat disk made of 99.99% pure platinum. Platinum is a well-defined electrocatalytic surface that shows a distinct hydrogen adsorption wave in cyclic voltammetry. It is used to study hydrogen and oxygen reactions and to detect hydrogen peroxide and oxidants. Because its overpotential for hydrogen evolution is low, its usable range in the negative direction in aqueous media is narrower than that of carbon electrodes.

This model has a standard straight PTFE body, with the platinum disk at the tip, in line with the rod. Disk diameters: Ø0.5–6 mm. PTFE is inert to nearly all acids, bases and solvents, so it also suits electrolytes that attack PEEK, like concentrated sulfuric acid. It is soft, so avoid scratching or denting it. PEEK, L- and T-type versions are on separate pages.

Key Features

PTFE body: inert to nearly all acids, bases and solvents; as a soft material (Shore D ≈ 55) it needs care against scratches and dents
Standard straight body: the disk sits on the end face, in line with the rod; the electrode is dipped vertically into the cell
99.99% pure platinum disk
Distinct hydrogen adsorption wave: a reference surface for checking surface area and cleanliness
Disk diameter options Ø0.5, 1, 2, 3, 4, 5 and 6 mm
Polishing with 1 µm diamond and 0.05 µm alumina, or electrochemical cleaning by potential cycling
Body length 60 mm, total length ≈75 mm (manufacturer data); gold-plated contact pin at the tail

Technical Specifications

Electrode type	Platinum disk working electrode
Electrode shape	Standard straight rod; disk on the end face, in line with the body axis
Body material	PTFE (polytetrafluoroethylene)
Disk material	Platinum, 99.99%
Disk diameter	0.5, 1, 2, 3, 4, 5, 6 mm
Body / total length	60 mm / ≈75 mm (manufacturer data)
Connection	Gold-plated pin
Potential window (aqueous)	Negative limit set by hydrogen evolution (low overpotential), positive limit by oxygen evolution; values depend on electrolyte and pH
Polishing	1 µm diamond slurry on a nylon pad, then alumina on microcloth (final step 0.05 µm); rinse with pure water
Electrochemical cleaning	As an alternative to polishing, by potential cycling in a suitable electrolyte
Body chemical resistance	Inert to nearly all chemicals and solvents; attacked only by very reactive substances such as elemental alkali metals, elemental fluorine and chlorine trifluoride
Operating temperature	Not specified for this product. One electrode maker recommends 10–25 °C for similar PTFE-body disk electrodes; a body expanding with heat can break the seal

Available Options

Diameter	Description
0.5 mm	Ø0.5 mm platinum disk
1 mm	Ø1 mm platinum disk
2 mm	Ø2 mm platinum disk
3 mm	Ø3 mm platinum disk
4 mm	Ø4 mm platinum disk
5 mm	Ø5 mm platinum disk
6 mm	Ø6 mm platinum disk

For sizes and specifications not listed above, you can request a custom quotation through the Quote Form.

Applications

Hydrogen adsorption/desorption and platinum surface electrochemistry
Measurements in strongly acidic electrolytes that damage PEEK, such as concentrated sulfuric acid
Routine voltammetry in standard three-electrode glass cells, with the electrode dipped vertically through the lid
Electrocatalysis tests using Pt as a reference surface for hydrogen evolution and oxygen reduction
Electrochemical detection of hydrogen peroxide (H₂O₂) and oxidants