*2.3. Electrode Preparation*

The WBE was made of a total of 100 (10 × 10) matrices by epoxy resin array; the electrode wires were made of L360 pipeline steel wires with a diameter of 1.5 mm, which were soldered on a copper wire, and each wire's separation was 0.5 ± 0.05 mm; the total exposed area was 1.766 cm2. The size of the conventional working electrode was 10 mm × 10 mm × 3 mm, and copper wires were soldered on the working electrodes to ensure conductivity, leaving an area of 10 mm × 10 mm as the experimental surface, and the rest of the surfaces were sealed with epoxy resin. All experimental electrodes were mechanically ground with a series of silicon carbide papers down to 2000# grade, washed in acetone and ethanol, dried with cold air, and prepared for testing. The fused sublimation sulfur was coated on the electrode surface to prepare the sulfur-coated electrode. After solidification, the thickness of the coating was controlled within 1.0–1.5 mm by 2000# sandpaper grinding (coating thickness was determined using a vernier caliper) to ensure that there were no cracks in the sulfur layer, and the working area of the electrode was covered by a sulfur layer. The average coated mass of the sample was calculated to be 0.1050 g using the subtraction method. To better simulate the deposition of S8 on the pipeline, electrochemical measurements were carried out at the end of 2 h of pre-immersion under S8 deposition to stabilize the open circuit potential (OCP).
