Question

What is the standard reduction potential of a standard hydrogen electrode?

Answer 1

The standard hydrogen electrode is a redox electrode that is used by scientists as a reference for all half-cell potential processes and serves as the foundation for the thermodynamic scale of oxidation – reduction potentials. SHE is the short form.

Complete Step By Step Answer:
Standard hydrogen electrode is a gas – ion electrode It is used to determine the standard electrode potential of elements and other half cells as a reference electrode. It may function as both an anode and a cathode half-cell. At $25^\circ C$ , the value of its standard reduction and oxidation potentials is always zero.
Platinum is utilised in standard hydrogen electrodes for the following reasons: Platinum is a very low-reactive metal, and it is almost inert. It does not contaminate other half-electrode cells .If a different reference is utilised, such as mercury, silver, or copper, the system may be poisoned. Platinum does not take part in the reaction, but it does provide a surface for oxidation and reduction reactions to take place.
The standard hydrogen electrode is used as a key reference electrode to determine the standard electrode potentials (relative) of elements and other electrodes. The following are the advantages of a standard hydrogen electrode: – Its electrode potential can be treated as zero because the hydrogen electrode develops a very modest potential.

Note:
Standard hydrogen electrode problem to transport. It is challenging to build and keep up with. Maintaining the pressure of hydrogen gas and the concentration of an acid solution, such as HCl, is difficult. Pure hydrogen gas is difficult to get.