5 Questions
What is the equation for the equilibrium deposition potential?
$e_{eqm} = e_o + \ln \left(\frac{C}{Z F}\right)$
What is the extra voltage known as when the equilibrium deposition potential is not sufficient to start the reaction?
Activation or chemical polarization
What factors affect activation polarization ($\eta_a$)?
Current density
What is the equation for activation polarization ($\eta_a$) in terms of current density ($i$)?
$\eta_a = a + b \log i$
In which reactions does activation polarization (slow) appear more pronounced?
Electrodeposition and electro dissolution of metals such as Fe, Ni, Co, and discharge of gases such as H2, O2, and Cl2.
Explore the concept of activation (chemical) polarization in metal deposition from a well-agitated solution. Understand the equilibrium deposition potential and the additional activation voltage required to initiate the reaction.
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