RHE Reversible Hydrogen Electrode

Troubleshooting

Observation	Potential cause	Corrective
Wrong potential	Air bubble on the tip of RHE or Double junction chamber	Check the existence of air bubble and retry the electrolysis for removing the air.
	Leaking hydrogen gas	Check if the tube connection or tubing clamp is loosen or not. Exchange your electrode for new one, when you find some defect.
	Intrusion of atmosphere	Hydrogen gas may replace the air after a fez days. Please retry electrolysis.
	Wrong concentration of H+ in the solution	Change the solution to the new one.
Unstable potential	Air bubble on the tip of RHE or double junction chamber	Check the existence of air bubble and retry the electrolysis for removing the air.
Closed silicone tube	Deterioration of silicone tube	Cut the clogged tube or replace with the new silicone tube.
Imperfect removal of inner solution	Surface tension Dirty inner wall of electrode	Rinse the inner wall by a portion of ethanol and remove water.
Current overflow during electrolysis	Low current limit of potentiostat	Use commercial battery (from 3 V to 5 V) instead of your potentiostat by connecting the minus with your Reversible Hydrogen Electrode (RHE) by holding hydrogen gas up to the level, as shown in the photoon the right.
Long time of electrolysis	Low concentration of H+ in the solution	Increase the setting negative electrolysis potential, more negative potencial.
	Leaking hydrogen gas	Check if the tube connection or tubing clamp is loosen or not.