How to determine ΔEo of a compound?

[candy4me]

Hello,

My project this year relates to fuel cell catalysts (see right) and I've been doing research on the topic.

By looking at volcano plots of catalysts, I've figured out that the effectiveness of a fuel cell catalyst is determined by change in standard electrode potential of the catalysts (ΔEo). Δ Eo is equal to Eo(reduction) - Eo(oxidation). For platinum [the control], ΔEo = 1.18 - (-1.18) = 1.18 + 1.18 = 2.36 volts.

My question is: I want to know how to determine ΔEo for a compound, for example, aluminum fluoride which is AlF3. I'm thinking it might be something like:
ΔEo of AlF3 = ΔEo of Al + ΔEo of F
OR
ΔEo of AlF3 = (Eo reduction of Al + Eo reduction of F) - (Eo oxidation of Al + Eo oxidation of F).

Can you tell me the formula for ΔEo for a compound?
Thank you,
candy4me

[candy4me]

Please help if you can, or if you can't, can you tell me how I might be able to find out? I have looked everywhere on the Internet...