XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

Abstract

SiO2 and γ‐Al2O3 impregnation with nominal 10 and 20% of cobalt was examined using wet impregnation method starting with Co(NO3)2·6H2O. The samples were dried and analyzed by XPS prior to calcination to study the surface species in the solids and the role of the support in the processing of supported cobalt catalysts. The results showed that cobalt introduction alters the few top nanometers of the support materials as there are significant changes recorded in the XPS spectra. Most importantly, there is a remarkable similarity between the O 1s XPS signal of SiO2 and γ‐Al2O3 following Co 20% impregnation, which suggests that these materials could have similar properties in terms of the oxidation ability and the general redox behavior. The shift of Al 2p peaks to higher binding energy (BE) in the XPS investigations and the shift of Si 2p peaks to lower BE were observed for high nominal cobalt loading. These results suggest that the choice of the support in cobalt‐based catalysts would tune the chemical characteristics of cobalt in the final materials.

Al2O3‐Coated, Single Crystal Zr/Y co‐Doped High‐Ni NCM Cathode Materials for High‐Performance Lithium‐Ion Batteries

“…The spectrum showed two distinct peaks at 75.3 and 72.3 eV corresponding to the Al 2p core level of Al-O and Li-Al-O bonds on the surface, respectively. [49,50] These results confirm the high uniformity of the Zr/Y doping and Al 2 O 3 coating in Zr 25 Y 15 -NCM@Al 20 , without a large population of agglomerates for any of the five elements. Furthermore, the analysis by inductively coupled plasma atomic emission spectroscopy (ICP-AES) shows that the measured values were well matched with the target composition of the samples (Table S1, Supporting Information).…”

Three-dimensional ternary NixCuyZnz(CO3)(OH)2 electrodes for supercapacitors: electrochemical properties and applications

“…2f shows the presence of O, the combination of the three fitted peaks at 530.5, 531.2, and 531.6 eV, which can be attributed to the typical bands of metal hydroxyl (M–OH), carbonate (CO 3 ), and C–OH bonds, respectively. 59 The electrode morphologies were examined by SEM. The nanostructures of the binary and ternary electrodes were uniformly grown on a Ni foam substrate, as shown in Fig.…”

New Strategy and Excellent Fluorescence Property of Unique Core–Shell Structure Based on Liquid Metals/Metal Halides

“…In Figure 4e, the spectrum of Al 2p was fitted into one sub‐peak, Al 3+ 2p at 75.23 eV. [ 49 ] The Al element in Al 2 O 3 , AlCl 3 , KAlCl 4 , and K 3 AlCl 6 were all present as Al 3+ . The Sn 3d spectrum in Figure 4f was fitted into four sub‐peaks, Sn3d 5/2 at 484.65 eV and Sn3d 3/2 at 493.12 eV, Sn 4+ 3d 5/2 at 487.43 eV and Sn 4+ 3d 3/2 at 495.90 eV.…”