Carbon−Nitrogen Place Exchange on NO Exposed β-Mo₂C

Abstract

Atomic nitrogen and oxygen were deposited on -Mo 2 C through dissociative adsorption of NO. Reflectance absorbance infrared spectroscopy (RAIRS), thermal desorption, and synchrotron X-ray photoelectron spectroscopy (XPS) measurements were used to investigate the interplay between atomic nitrogen, carbon, and oxygen in the 400-1250 K region. The combination of the high resolution and high surface sensitivity offered by the synchrotron XPS technique was used to show that atomic nitrogen displaces interstitial carbon onto the carbide surface. Thermal desorption measurements show that the burnoff of the displaced carbon occurs at approximately 890 K. The incorporation of nitrogen into interstitial sites inhibits oxygen dissolution into the bulk. RAIRS spectroscopy was used to identify surface oxo, terminal oxygen, species formed from O 2 and NO on -Mo 2 C.

Preparation of polyaniline grafted graphene oxide–WO3 nanocomposite and its application as a chromium(iii) chemi-sensor

“…5(d), the binding energy of N1s is 399.3 eV in the nanocomposite. 58 The O1s spectrum in Fig. 5(e) shows a distinguishing peak at 532.6 eV.…”

Identification of Hydroperoxy Species as Reaction Intermediates in the Electrochemical Evolution of Oxygen on Gold

“…Only O 1s photoelectrons with a binding energy of 530 eV (Au oxide) were recorded for Au surfaces held at OER potentials. [27,28] [29] At the anodic potentials applied during SERS, the main reactions are those for oxygen evolution; neither oxygen reduction nor irreversible gold oxide desorption ( Figure S2, Supporting Information) occur at these potentials. There is the possibility, though, for anodic oxidation of H 2 O to H 2 O 2 (in acid) or OOH À (in base) at the highest potentials used herein.…”

Preparation and olefin-metathesis activity of cyclopentylidene-oxo initiator sites on a molybdenum carbide surface

“…4 shows that the removal of the g 1 -state coincides with the development of new bands at 1324, 1043 and 978 cm À1 . The latter band is characteristic of a surface oxo group [9,18,19,33] indicating that carbonyl bond scission has taken place. In contrast, the absence of a new band in the 1600-2200 cm À1 region shows that decarbonylation leading to the formation of CO ads does not occur.…”

“…Hence, the bands at 872 and 889 cm À1 are assigned to the ring breathing mode of cyclopentylidene by reference to data for cyclopentanone [31]. As mentioned above, the bands at 978 and 952 cm À1 are readily assigned to the Mo-oxo vibration [19,25,33]. It is more problematic to assign the 1098 and 1043 cm À1 modes.…”