Figure 12.

a) Binding configurations of *COOH, *CO, and *CHO on the Mo edge of MoS₂. *COOH and *CHO preferably bind to the bridging S atoms, while *CO binds to the Mo atoms. Reproduced with permission.135 b) Cyclic voltammograms (CVs) of rGO–PEI–MoS_x modified glassy carbon electrode in N₂‐saturated and CO₂‐saturated 0.5 m aqueous NaHCO₃ solution, respectively. Inset: Structure of PEI. c) Faradaic efficiency for CO (red bars) and H₂ (blue bars) production at different applied potentials. Reproduced with permission.136 Copyright 2016, The Royal Society of Chemistry. Free energy diagrams of CO₂ conversion to CH₄ over d) Cu (211) and e) Mo₂C (100) surfaces at 0 V (vs RHE), respectively. The most endergonic step in the overall process is designated with an arrow. Reproduced with permission.141 Copyright 2016, American Chemical Society.