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What is the relationship between reaction rate and overvoltage for activation polarization?

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What is the relationship between reaction rate and overvoltage for activation polarization?

(a) na=±βlog(i0/i)

(b) na=±βlog(I/i0)

(c) na=±βlog(1-i0/i)

(d) na=±βlog(1-i/i0)

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This is a very interesting question from Modern Theory Principles in portion Modern Theory Principles of Corrosion Engineering

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Correct answer is (b) na=±βlog(I/i0)

The best explanation: The relationship between reaction rate and overvoltage for activation polarization can be noted as na=±βlog(I/i0) where β is a Tafel constant and i0 is exchange current density.

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