Hg particularly useful (i)high overpotential at -ve limit (ii)easy to prepare clean surface Hg Microelectrodes:(Fig 25-3) Me ury Wire 777777777 Hg Plunger Guide bushing Compression spring Polyurethane tip -Valve seat Capillary seal -Ferrule (bonded to capillary) Ferrule support Capillary -Capillary nut -Hg drop Hg drop- Capillary (d) CEM333 page 12.6
Hg particularly useful (i) high overpotential at -ve limit (ii) easy to prepare clean surface Hg Microelectrodes: (Fig 25-3) CEM 333 page 12.6
Voltammograms(voltammetric waves)are graphs of current (i)vs. applied voltage (Eappl) +100.0 Limiting current +80.0- A+ne-= +60.0 +40.0 Y- +20.0- 0.0 -20.0 .0-0.2 -0.4-0.6-0.8-1.0 Eappl (vs.SCE) Fig 25-5 Hg microelectrode is cathode-ve terminal in above A+ne-←→P E0=-0.26V Increase in current at potential at which A can be reduced (reaction demands electrons,supplied by potentiostat) CEM 333 page 12.7
Voltammograms (voltammetric waves) are graphs of current (i) vs. applied voltage (Eappl) Fig 25-5 Hg microelectrode is cathode -ve terminal in above A + ne - « P E 0 = -0.26 V Increase in current at potential at which A can be reduced (reaction demands electrons, supplied by potentiostat) CEM 333 page 12.7