How to clean the counter electrode i.e platinum?

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Carlos Araújo Queiroz

I would suggest cleaning the contaminated platinum electrode with hot (to boiling) aq. hydrochloric acid (~ 18 wt%). Alternatively you may try conc. hydrofluoric acid (room temperature). If both approaches are found unsatisfactory, you may try cleaning with fused potassium bisulphate (~ 1 min) to be then dissolved with boiling water.