The active tip of the electrode is a flat disk made of 99.99% pure platinum. Showing a clear hydrogen adsorption wave in cyclic voltammetry, platinum is a convenient reference surface for checking surface cleanliness and active area. It is preferred for studying hydrogen evolution and oxygen reduction, and for detecting hydrogen peroxide. Its negative range is narrower than carbon's because hydrogen evolution starts early.

In this L-shaped model the platinum disk sits on the end face of the PTFE body's perpendicular head, so it faces sideways. This suits in-situ Raman cells, where the disk must be close to the window, and photoelectrochemistry, where it faces the light. Disk diameters: Ø0.5–6 mm. PTFE is inert to nearly all chemicals but soft; handle with care. Other shapes and bodies are on separate pages.

Key Features

L-shaped body: the disk is on the end face of a short perpendicular head; the surface faces sideways, 90° to the body axis
99.99% pure platinum disk
PTFE body: inert to nearly all acids, bases and solvents; as a soft material (Shore D ≈ 55) it needs care against scratches and dents
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	L-shaped; disk on the end face of a short perpendicular head (faces sideways, 90° to the body)
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
Photoelectrochemistry setups: the disk surface can be turned toward the light source
Cells with an optical window such as in-situ Raman cells: the disk faces the window and sits close to it
Electrocatalysis tests using Pt as a reference surface for hydrogen evolution and oxygen reduction
Electrochemical detection of hydrogen peroxide (H₂O₂) and oxidants