The measuring surface of this electrode is a 99.999% pure gold disk embedded in an insulating body. A gold surface forms ordered monolayers (SAMs) with thiol-containing molecules, and this is why it is used for surface modification, biosensors and thiol detection. Compared with platinum it has no hydrogen adsorption wave and a wider working range in the negative direction; in the positive direction, surface oxidation sets the limit.

In the T-shaped model the lower section of the body is a wider cylinder, with the gold disk on its end face. This shape is chosen to fit cells and holders designed for it; check your cell's electrode port before ordering. Disk diameters: Ø0.5–6 mm. The PEEK body is hard and creep-resistant. Straight and L-shaped types and a PTFE version are offered separately.

Key Features

99.999% pure gold disk
PEEK body: hard and rigid (Shore D ≈ 85) and resistant to creep under load; not for use with concentrated sulfuric or nitric acid
T-shaped body: the lower section of the straight body is a wider cylinder; the disk sits on its end face
Disk diameter options Ø0.5, 1, 2, 3, 4, 5 and 6 mm
Surface renewed by polishing with 1 µm diamond, then 0.05 µm alumina
Suitable surface for thiol-based SAMs; no hydrogen adsorption wave, wider negative range than platinum
Body length 60 mm, total length ≈75 mm (manufacturer data); gold-plated contact pin at the tail

Technical Specifications

Electrode type	Gold disk working electrode
Electrode shape	T-shaped; lower body section is a wider cylinder, disk on its end face
Body material	PEEK (polyether ether ketone)
Disk material	Gold, 99.999%
Disk diameter	0.5, 1, 2, 3, 4, 5, 6 mm
Gold disk length	5 mm (manufacturer data)
Body / total length	60 mm / ≈75 mm (manufacturer data)
Connection	Gold-plated pin
Approx. potential window (vs. RHE)	0.1 M H₂SO₄: ≈ −0.10 to +1.33 V · 0.1 M NaOH: ≈ −0.14 to +1.29 V; positive limit set by surface oxidation
Polishing	1 µm diamond slurry on a nylon pad, then alumina on microcloth (final step 0.05 µm); rinse with pure water
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 gold disk
1 mm	Ø1 mm gold disk
2 mm	Ø2 mm gold disk
3 mm	Ø3 mm gold disk
4 mm	Ø4 mm gold disk
5 mm	Ø5 mm gold disk
6 mm	Ø6 mm gold disk

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

Applications

Voltammetry and impedance measurements in cells and holders designed for the T-shaped body
Surface modification with thiol-based SAMs and preparation of modified electrodes
Biosensor and electrochemical sensor development
Electrochemical detection of thiol compounds
Setups where the electrode is frequently removed and refitted and the body is under mechanical stress