Part A The two half-reactions that are used in the direct methanol fuel cell are

Question

Part A

The two half-reactions that are used in the direct methanol fuel cell are shown below.
I 2 CH3OH(aq) + 2 H2O(l) 2 CO2(g) + 12 H+(aq) + 12 e-
II 3 O2(g) + 12 H+(aq) + 12 e– 6 H2O(l)
The electrode at which half-reaction I occurs is the ________ The electrode at which half-reaction II occurs is the ________

Express your answers as chemical formulas separated by a comma.

Part B

At anode ________ is oxidized, at cathode ________ is reduced.

Express your answers as chemical formulas separated by a comma.

Explanation / Answer

oxidation reaction occurs at electrode called anode

reduction half-reaction occurs at electrode called cathode

Oxidation reaction - I

2 CH3OH(aq) + 2 H2O(l) 2 CO2(g) + 12 H+(aq) + 12 e-

Reduction reaction - II

3 O2(g) + 12 H+(aq) + 12 e– 6 H2O(l)

Part a

The electrode at which half-reaction I occurs is the ANODE - CH3OH

The electrode at which half-reaction II occurs is the CATHODE - O2

Part b

At anode, C of CH3OH is oxidized from - 2 to +4

At cathode, O2 is reduced from 0 to - 2

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