The measuring surface of this electrode is a 99.999% pure gold disk embedded in an insulating body. Unlike platinum, gold shows no hydrogen adsorption wave and offers a wider working range in the negative direction; in the positive direction it is limited by oxidation of its surface. Its main advantage is that it forms self-assembled monolayers (SAMs) with thiol compounds, which is why it is a frequent choice for modified electrodes and biosensors.

This is the standard straight type: the gold 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
99.999% pure gold disk
Disk diameter options Ø0.5, 1, 2, 3, 4, 5 and 6 mm
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
Surface renewed by polishing with 1 µm diamond, then 0.05 µm alumina

Technical Specifications

Electrode type	Gold 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	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

Routine voltammetry in standard three-electrode glass cells, with the electrode dipped vertically through the lid
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