Which factor is listed as affecting electrode potentials with emphasis on polarization behavior of the materials?

• A. Electrolyte viscosity
• B. Polarization behavior of the coupled materials
• C. Ambient humidity
• D. Electrode color

Answer: (B)

Electrode potentials under load move from their standard values because the interfaces polarize when current flows. The way the materials interact—their polarization behavior—determines how much and in what direction the potential shifts. Activation polarization is the extra energy needed for charge transfer at the interface, while concentration polarization comes from getting enough reactants to or removing products from the surface. These polarization effects are specific to the coupled materials, so this factor best explains changes in electrode potentials. Other factors like electrolyte viscosity or ambient humidity can influence the conditions that affect polarization, but they don’t define the electrode potential through polarization behavior itself, and electrode color has no electrochemical effect.