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X‐ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy study on the CO chemisorbed over amorphous FeNiB alloys

A surface study has been conducted to determine CO interaction with Fe80B20 and Fe40Ni40B20 samples in amorphous and crystalline forms in the presence and absence of H2. At 300 K molecular CO exists only on Ar+ etched surface of partially and fully crystallized FeNiB indicated by ultraviolet photoelectron spectroscopy (UPS) and x‐ray photoelectron spectroscopy peaks at 8.3, 11.6, and 285.5 eV (C 1s), respectively, as well as by CO thermal desorption spectroscopy. CO dissociation revealed by UPS peaks at 5.6 eV also occurs. Oxide species of B, Fe, and Ni cannot be observed at all. On the other hand, at 570 K a C 1s peak appears representing a carbidic and graphitic species in the binding energy (B.E.) range of 283.2 and 284.6 eV, respectively. Regardless of the presence of H2, B is always oxidized on the surface, while Fe and Ni are maintained in metallic form. Since practically no difference exists between carbidic C 1s measured here and on polycrystalline Fe film, the unique high catalytic activity of pa...