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. 2008 Oct 3;74(23):7348–7355. doi: 10.1128/AEM.01639-08

TABLE 2.

Theoretical potentials under the condition that the anode electrolyte has a pH of 7^a

Reaction	Half reaction	E′_{pH = 7} vs SHE
Acetate oxidation	CH₃COO⁻ + 4H₂O → 8e⁻ + 9H⁺ + 2HCO₃⁻	−0.296 V^b
Fumarate reduction	(CHCOO)₂²⁻ + 2H⁺ + 2e⁻ → (CH₂COO)₂²⁻	+0.031 V
Ferric reduction	Fe³⁺ + e⁻ → Fe²⁺	+0.771 V
Oxygen reduction	O₂ + 4H⁺ + 4e⁻ → 2H₂O	+0.816 V

^a

Calculated from Gibbs free energy using data from reference 43.

^b

Calculated at typical conditions of an MFC (HCO₃⁻ = 5 mM; CH₃COO⁻ = 5 mM).