Handout14B-Electroanalytical

Handout14B-Electroanalytical - TECHNIQUES i = 0 TECHNIQUES...

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CEM 834 ELECTROANALYTICAL METHODS FALL 2005 FIGURE 1: Tafel plots for anodic and cathodic branches of the current–overpotential curve for 2 0 Ox ne Red with n 0.5, T = 298 K, and j 10 A/cm = , =  . FIGURE 2: Effect of exchange current density on the activation overpotential required to deliver net current densities. (a) j 0 = 10 –3 A/cm 2 , (b) j 0 = 10 –6 A/cm 2 , (c) j 0 = 10 –9 A/cm 2 . For all cases the reaction is Ox ne Red withα 0.5, n 1 = = , and T = 298 K.
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FIGURE 3: Effect of the transfer coefficient on the symmetry of the current–overpotential curves for 2 0 Ox ne Red with n 1 T = 298 K, and j 10 A/cm = ,  . 2
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FIGURE 4: Classification of electroanalytical methods. EQUILIBRIUM
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Unformatted text preview: TECHNIQUES i = 0 TECHNIQUES i > 0 METHODS EXHAUSTIVE NON-EXHAUSTIVE METHODS NON-EQUILIBRIUM EXHAUSTIVE METHODS METHODS METHODS METHODS NON-EXHAUSTIVE STEADY-STATE TRANSIENT 1. Potentiometric 1. Potentiometry 1. Electrolysis 2. Coulometric 3. Amperometric Titration Titration Titration 1. Classical Voltammetry 2. Classical Polarography 1. Linear Sweep or Cyclic Voltammetry 2. Pulse Polarography 3. Chronomethods 3 FIGURE 5: Some types of voltammetry: (a) rapid scan, (b) cyclic, (c) ac, (d) stripping. 4 FIGURE 6: Some types of polarography: (a) linear scan, (b) current sampled, (c) normal pulse, (d) differential pulse. 5...
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