1. Electrified Interfaces
The structure of the electrical double layer

2. Refresher-Galvanic cells
line notation (shorthand)
| interface between two phases. || salt bridge
Cd(s) | CdCl2(aq, M) || AgNO3(aq, M) | Ag(s)

3. Half-Reactions
Ecell= Ecathode (+) - Eanode(-)

4. Standard Hydrogen Electrode
Pt(s) | H2(g, A=1) | H+(aq, A=1) || Ag+(ag, A=1)
|_________________________|
NHE
H+(aq, A=1) + e-  1/2H2(g, A=1) E0=0 V

5. Electrochemical Series
Reduction half-reactions
oxidant reductant E0 (V)
stronger oxidant
F2(g) + 2e-  2F
Ce4+ + e-  Ce
Ag+ + e-  Ag(s)
Fe3+ + e-  Fe
O2 + 2H+ + 2e-  H2O
Cu2+ + 2e-  Cu(s)
2H+ + 2e-  H2(g)
Cd2+ + 2e-  Cd(s)
Zn2+ + 2e-  Zn(s)
K+ + e-  K(s)
Li+ +e-  Li(s)
stronger reducer

6. Nernst Equation for a half-rxn aOx + ne-  bRed
R= gas constant T= temperature in Kelvin
n= no. of electrons in half-rxn
F= Faraday constant (96485 C/mol)
A= activity (= 1 for a pure solid, liquid or solvent and expressed in mol/L for solutes and in bar for gases)

7. Electrical Double Layer

8. The electrical double layer

9. More sophisticated model

10. Recent Models

11. Current Model
BDM (Bockris, Devanathan, Muller)