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I've read that a platinum electrode has no effect in a hydrogen fuel cell - why is this? Also, what is the effect of the surface area of an electrode such as zinc in a zinc copper cell?

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  • $\begingroup$ Area? No - it only increases the maximum Current, However surface curvature, crystallographic texturing, and crystallographic strain can, which often confounds results and leads people to believe that area does. $\endgroup$ – A.K. Jun 11 '17 at 14:00
  • $\begingroup$ To amend my comment, Imagine you have a second identical electrochemical cell. Does the emf increase? No, the EMF is the same even though you have doubled the surface area in this case. $\endgroup$ – A.K. Jun 11 '17 at 14:06
  • $\begingroup$ I think you Should split the is question into two independent questions, as they are independent of each other. This would make it easier to provide an appropriate answer. $\endgroup$ – A.K. Jun 11 '17 at 15:29

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