I have problem of making Tungsten ultramicroelectrode(UME).
I tried several method followed by literature refereces, but still have same problem in CV.
The reason for the artifact spike is due to unstable OCV.
I have no idea how to solve this. Is there anyone who get through this kind of problem?
working electrode is tungsten wire UME, reference is SHE, and counter electrode is Pt.
Ahmed Emad Fathy Abbas
The unstable open circuit potential (OCP) and artifact spike in the cyclic voltammogram (CV) indicate the tungsten UME surface is not properly prepared/conditioned. Make sure to follow surface polishing and electrochemical pretreatment protocols specifically for tungsten electrodes. Ensure the tungsten wire is securely sealed in glass so only the very tip is exposed. Any exposed conductive side surface can contribute to background noise/interference. Use a microscope to inspect. Use a high quality potentiostat with proper shielding and an effective Faraday cage setup to minimize electrical noise pickup. An unstable reference electrode connection can also cause electrical noise. Rule out issues with electrolyte purity and contamination. Use high purity chemicals and solvents. Properly degas solutions. Make the electrode diameter as small as possible (1-5 μm) to minimize capacitative charging current and achieve steady-state behavior more quickly. Allow adequate equilibration time after immersing the UME and before testing.
Here are some troubleshooting suggestions:
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