Electrochemical Properties
Glassy carbon electrode (GCE) in aqueous solutions is considered to be an inert electrode for hydronium ion reduction:
- H3O+(aq) + e- H(aq) E
o= −2.10 V versus NHE at 25 °C
Comparable reaction on platinum:
- H3O+(aq) + Pt(s) + e- Pt:H(s) E
o= 0.000 V versus NHE at 25 °C
The difference of 2.1 V is attributed to the properties of platinum which stabilizes a covalent Pt-H bond.
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