User:Benjah-bmm27/degree/3/DJF

Dynamic electrochemistry, DJF

• Dynamic electrochemistry
• Electrochemistry
  • Quantum electrochemistry
  • Electrochemical reaction mechanisms
  • Electroanalytical methods
    • Potentiostat
    • Amperometric titration
    • Coulometry
    • Voltammetry
      • Linear sweep voltammetry, staircase voltammetry, squarewave voltammetry
      • Cyclic voltammetry
      • Anodic stripping voltammetry, cathodic stripping voltammetry, adsorptive stripping voltammetry
      • Rotated electrode voltammetry, rotating disk electrode, rotating ring-disk electrode
      • Differential pulse voltammetry
      • Polarography
      • Chronoamperometry

Butler-Volmer equation

• Butler–Volmer equation
• Tafel equation
• Overpotential

Amperometry at constant potential

• Amperometry - measuring current
• Linear sweep voltammetry - measure current while increasing potential linearly with time
• The diffusion limiting current depends on the concentration gradient, which is time dependent
• To express current as a function of time, use Fick's Second Law of diffusion to derive the Cottrell equation via a Laplace transform

Cyclic voltammetry

• Cyclic voltammetry
• Linear Sweep & Cyclic Voltammetry: The Principles from the Cambridge Chemical Engineering electrochemistry group.
• Randles-Sevcik equation
• For a reversible reaction, the peak-to-peak separation is 59 mV / n, where n is the number of electrons transferred per molecule/species
• Peak positions are independent of sweep rate, ν