Chemsitry Hydrogen fuel cells help (A2) OCR

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Arcade22
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This is about alkali fuel cells. I dont undrstand what the 'redox system' equations are for, or what they mean and generally why they were stated in the text book. I do understand the half equation, but would really like some clarification on the redox system part (keep it simple, i'm definately no chemist XD)
Thanks in advance

Redox system:
2H20(l)+ 2e- <--> H2(g) +2OH- (aq)
0.5 O2 (g) +H2O(l) +2e- <--> 2OH - (aq)
Half-equations:
Oxidation: H2(g) + 2OH-(aq) --> 2H2O (l) +2e-
Reduction: 0.5 O2 (g) +H2O(l) +2 e- --> 2OH - (aq)
overall: H2(g) +0.5 O2 (g) --> 2H2O (l)

(oxygen and hydrogen go in, and water comes out of the fuel cell thats all I really got from the text book)
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Salyhaha
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The redox system is just describing the reactions of two half cells in the hydrogen fuel cell - together they form a 'redox system' because, as you stated, in the hydrogen fuel cell the 2H20 + 2e- -> H2 + 2OH half cell will be the oxidation reaction, and the 1/2 O2 + H20 + 2e- -> 2OH- half cell is the reduction reaction. The overall reaction (as in, the hydrogen fuel cell system) is therefore redox.
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Arcade22
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(Original post by Salyhaha)
The redox system is just describing the reactions of two half cells in the hydrogen fuel cell - together they form a 'redox system' because, as you stated, in the hydrogen fuel cell the 2H20 + 2e- -> H2 + 2OH half cell will be the oxidation reaction, and the 1/2 O2 + H20 + 2e- -> 2OH- half cell is the reduction reaction. The overall reaction (as in, the hydrogen fuel cell system) is therefore redox.
Ah ok I think that makes sense! Thank you so much!
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