Measurements take place on a 99.99% pure platinum disk embedded in an insulating body. 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 is the standard straight type: the platinum disk sits at the tip, in line with the PEEK rod, and the electrode is dipped vertically through the cell lid. Disk diameters: Ø0.5–6 mm. PEEK is hard and rigid and keeps its shape when the electrode is often refitted, but concentrated sulfuric and nitric acid damage it. L- and T-shaped types and a PTFE version are separate products.

Key Features

Standard straight body: the disk sits on the end face, in line with the rod; the electrode is dipped vertically into the cell
PEEK body: hard and rigid (Shore D ≈ 85) and resistant to creep under load; not for use with concentrated sulfuric or nitric acid
99.99% pure platinum disk
Disk diameter options Ø0.5, 1, 2, 3, 4, 5 and 6 mm
Distinct hydrogen adsorption wave: a reference surface for checking surface area and cleanliness
Body length 60 mm, total length ≈75 mm (manufacturer data); gold-plated contact pin at the tail
Polishing with 1 µm diamond and 0.05 µm alumina, or electrochemical cleaning by potential cycling

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	PEEK (polyether ether ketone)
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	Resistant to most aqueous and organic media; not compatible with concentrated sulfuric acid, concentrated nitric acid or halogen acids such as HF, HBr, HI
Operating temperature	Not specified for this product. One electrode maker recommends 10–80 °C for similar PEEK-body disk electrodes; extreme temperatures can damage the disk–body 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

Routine voltammetry in standard three-electrode glass cells, with the electrode dipped vertically through the lid
Hydrogen adsorption/desorption and platinum surface electrochemistry
Electrocatalysis tests using Pt as a reference surface for hydrogen evolution and oxygen reduction
Electrochemical detection of hydrogen peroxide (H₂O₂) and oxidants
Setups where the electrode is frequently removed and refitted and the body is under mechanical stress