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Abstract:
Upon adsorption of CO2 at T ≈ 90 K on Ni (110), the molecule weakly chemisorbs and undergoes a geometrical distortion, i.e. it bends into a nonlinear geometry. This geometrical distortion is triggered by electron transfer from the substrate to the molecule, accompanied by formation of an anionic COδ−2 molecule. It is shown via HREELS spectra that COδ−2 reacts with adsorbed H atoms in low concentration (⩽0.1) via a Langumuir-Hinshelwood mechanism to form the formic acid anion, i.e. formate, which remains adsorbed on the surface. Hydrogen coverages, which allow the surface ot reconstruct, inhibit CO2 chemisorption.
