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. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: J Am Chem Soc. 2014 Sep 19;136(39):13518–13521. doi: 10.1021/ja506998b

Figure 1.

Figure 1

Scheme showing a photoelectrochemical cell for selective reduction of CO2 to CO at p-type NiO. Light absorption by the organic dye P1 (red) is followed by electron transfer to CODH, which is coadsorbed on the NiO surface and carries out CO2 reduction, while hole injection into the NiO valence band regenerates the P1 ground state. The porous nature of the NiO surface is indicated by the SEM image (the full image is given in the Supporting Information). The Fermi level and valence band potentials of NiO are denoted as EF and EVB.