Construction of SHE Standard Hydrogen Electrode and Working

What is Standard Hydrogen Electrode?

Standard Hydrogen Electrode (SHE) is a hydrogen electrode consisting of a platinum plate immersed in the 1 molar solution of sulphuric acid. A current of pure hydrogen gas is passed continuously through the solution under the presence of 1-atm.

The platinum absorbs hydrogen gas on its surface and the platinum coated with the hydrogen behaves as if it were made entirely of of Standard Hydrogen Electrode-min

Since absolute electrode potential cannot be measured, hence it is determined by comparing it with the hydrogen electrode which is a reference electrode. The arbitrary hydrogen electrode has assigned a potential of 0.000 volts.

Electrode Potential

The difference in the potential created between a metal and the solution of its salt is called electrode potential. OR it is the measure of the tendency of an electrode to lose or gain electrons. It is denoted by ‘E0’.

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