Spectroscopic study of nitrogen distribution in N-doped carbon nanotubes and nanofibers synthesized by catalytic ethylene-ammonia decomposition

Nitrogen Doped Carbon Nanotubes and Nanofibers for Green Hydrogen Production: Similarities in the Nature of Nitrogen Species, Metal–Nitrogen Interaction, and Catalytic Properties

“…Thus, it can be stated that the possibilities of XP spectroscopy used in this study make it possible to reliably conclude only on an increase in the relative amount of platinum with Eb(Pt4f7/2) = 72.9 eV in N-doped catalysts. Sensitivity of the methods should be increased considerably to make a reliable and detailed interpretation of the changes that occur in the N1s spectra upon platinum deposition on N-CNTs, in which, as we have shown, nitrogen is distributed uniformly in the bulk of the material [15]. To confirm the interaction of metals with certain nitrogen sites of N-CNMs, a detailed analysis of the XPS spectra of deposited metal and nitrogen is commonly used.…”

“…Indeed, it is known that multiple edges of graphene layers enriched with pyridinic nitrogen are segregated to the surface of N-CNFs [14], which explains the preferential interaction of deposited metals with these sites. In this connection, it seems interesting to explore the interaction of metals with N-CNMs with another structure, for example, with the widely used bamboo-like N-CNTs where all nitrogen species (pyridinic, pyrrolic, and graphitic) are located within internal and external graphene layers [15] and can equiprobably participate in the stabilization of deposited metals. This paper is devoted to the investigation of the effect of the bamboo-like N-CNTs on the properties of Pt/N-CNTs catalysts synthesized by impregnation and homogeneous precipitation methods.…”

Highly Stable Single‐Atom Catalyst with Ionic Pd Active Sites Supported on N‐Doped Carbon Nanotubes for Formic Acid Decomposition

“…We did not observe shifts of the maxima or new lines in the XPS spectrum as compared to the support, which could serve as direct evidence of palladium interaction with a certain nitrogen species, probably owing to the high excitation energy used (ca. 1500 eV) …”

The evolution of the M1 local structure during preparation of VMoNbTeO catalysts for ethane oxidative dehydrogenation to ethylene

“…was performed using the homemade XPS-Calc program, which has been tested on a number of systems. [36][37][38] The procedure of curve tting was performed using an approximation based on a combination of the Gaussian and Lorentzian functions with the subtraction of Shirley-type background.…”