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Experimental data on RHE Reversible hydrogen electrode

RHE (Reversible hydrogen electrode) was tested for the evaluation, where the stability of the potential in function of the time and temperature was tested and compared with the reference against SHE. Also, the potential difference between RHE and line up reference electrode was measured.

  • Time series change of the potential
  • Comparison of Cyclic Voltammograms between RHE and Ag/AgCl reference electrode
  • Potential difference between RHE electrode and others reference electrodes changing hydrogen level

Time series change of the potential

Experimental conditions
Reference electrode: RHE Reversible hydrogen electrode
Working electrode: RE-1CP Reference electrode (Ag/AgCl/Saturated KCl) (Cat. No. 013503)
EC technique: open circuit potential - time
Solution: 1.2 mol/L Hydrochloric acid solution
Charge passed for hydrogen generation: 2 C
Temperature: 25°C


Time series change of the potential
RHE Reversible hydrogen electrode potential change over time

RE-1CP Reference electrode (Ag/AgCl/Saturated KCl) (Cat. No. 013503) was connected to the potentiostat working electrode connector.
The potential change after 80 hours of electrolysis was about 5 mV, and about 1 mV from 20 to 60 hours.


Comparison of Cyclic Voltammograms between RHEK and Ag/AgCl reference electrode

Experimental conditions
Reference Electrode: RHE Reversible hydrogen electrode with Double junction chamber and 1.2 mol/L Hydrochloric acid solution
RE-1CP Reference electrode (Ag/AgCl/Saturated KCl) (Cat. No. 013503)
Working Electrode: PTE Platinum electrode OD: 6.0 mm ID: 1.6 mm (Cat. No. 002013)
Counter Electrode: Platinum counter electrode 23 cm (Cat. No. 012961)
EC technique: Cyclic Voltammetry
Applied Potential: 0.9 V ∼ 0.05 V (RHE Reversible hydrogen electrode),
0.7 V ∼ -0.15 V (RE-1CP Reference electrode (Ag/AgCl/Saturated KCl))
Scan Rate: 0.1 V/s
Solution: 2 mmol/L K3Fe(CN)6 + 1 mol/L KNO3
Temperature: 25°C


Comparison of Cyclic Voltammograms between RHEK and Ag/AgCl reference electrode
Red line: RHE Reversible hydrogen electrode    Blue line: RE-1CP Reference electrode (Ag/AgCl/Saturated KCl)

The difference between the peak potentials of the two cyclic voltammograms is 0.201 V, which is approximately equal to the potential 0.198 V of the saturated KCl silver-silver chloride reference electrode for the standard hydrogen electrode at 25°C.


Comparison of the potential difference between RHE electrode and others reference electrodes changing hydrogen level

Experimental conditions
Reference Electrode: RHE Reversible hydrogen electrode
Working Electrode: RE-1CP Reference electrode (Ag/AgCl/Saturated KCl) (Cat. No. 013503)
RE-2BP Calomel Reference electrode (Cat. No. 013458)
Counter Electrode: Platinum counter electrode 23 cm (Cat. No. 012961)
EC technique: open circuit potential - time
Solution: 1.2 mol/L Hydrochloric acid solution
Temperature: 25°C


Comparison of Potential difference between RHE electrode and others reference electrodes changing hydrogen level
Purple■:RE-2BP Calomel Reference electrode    Blue●:RE-1CP Reference electrode (Ag/AgCl/Saturated KCl)

When 1.2 mol/L hydrochloric acid is used in the electrolytic solution at 25°C, it is found that the potential of each reference electrode is almost stabilized when the amount of electric charge during electrolysis exceeds 1 C.