It sounds like magic: photoelectrodes could convert the greenhouse gas CO2 back into methanol or N2 molecules into valuable fertilizer—using only the energy of sunlight.
Four diamond materials are shown here: “Diamond black” made of polycrystalline nanostructured carbon , the same material before nanostructuring , an intrinsic single crystal and a single crystal doped with boron . Credit: A. Chemin/HZBback into methanol or NAn HZB study has now shown that diamond materials are in principle suitable for such photoelectrodes.
They are fully sustainable and made of carbon only, they degrade little in time compared to metal-based photoelectrodes and they can be industrially produced! Dr. Arsène Chemin, a postdoctoral researcher in Petit's team, studied samples of diamond materials produced at the Fraunhofer Institute for Applied Solid State Physics in Freiburg. The samples were engineered to facilitate the COreduction reaction: doped with boron to insure good electrical conductivity and nanostructured, which gives them huge surfaces to increase the emission of charge carriers such as electrons.
By combining these results, he was able for the first time to draw a comprehensive picture of the processes that take place on the surfaces of the sample after excitation by light.
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