Electrochemistry - Half Cell Reactions

[AGNuke]

A Galvanic Cell is given. Write its Anode and Cathode half reactions, complete cell reaction and thus determine if the given is concentration cell.

$Pt|O_2(1\; atm)|NaO\! H(10^{-3}M)||H_2SO_4(0.5M)|O_2(1\;atm)|Pt$

I know that at anode, Oxygen will get oxidised, maybe from NaOH solution and at cathode, Oxygen will get reduced.

Here's what I think of anodic reaction
$2O\!H^-\rightarrow 2H^++O_2+4e^-$

And the mighty cathodic reaction
$O_2+4e^-+2H^+\rightarrow 2O\!H^-$

And thus, this cell is just a concentration cell (i.e. E°(cell) = 0)


Am... I right?

 

[AGNuke]

Hello...? Can please anyone answer the question that I am right with my guesswork? This question is eating me inside out.