Where each potential listed is the reduction potential of each species under neutral conditions. The values came to be roughly 1.23 V and 1.02 V respectively, given a \(V_{MtrC}\) value of -0.2 V (V vs. SHE).
In the \(H_2\)-mediated case, we have \(H_2\) reducing NAD, as shown in the Z-scheme in panel A of Figure 2, which results in the loss of some efficiency due to the potential drop. Each fuel has an electron demand of \(n_{ef}\) and a combustion energy per molecule of fuel of \(E_{fuel}\), and assuming that we otherwise have 100% conversion efficiency at the enzymes, our thermionic efficiency \(η_{STF\ }\)from power received from the sun \(P_{solar}\) and the current in the biological cell are