Definition: The standard hydrogen electrode is the standard measurement of electrode potential for the thermodynamic scale of redox potentials.
The standard is determined by the potential of a platinum electrode in the redox half reaction
2 H+(aq) + 2 e- → H2(g) at 25 °C.
The standard hydrogen electrode is often abbreviated SHE.
Also Known As: normal hydrogen electrode or NHE
= 1.05 V – 0.0295 x log 80
= 1.05 V – 0.0295 x 1.9031
= 1.05 V – 0.056 = 0.99 V.