其中,卟啉钴和酞菁钴在7714-7716 eV附近有较强的一个边前峰(pre-edge peak),它是由中心原子Co的1s轨道向3pz轨道跃迁引起,与Co配位结构的对称性有关,被认为是具有平面结构Co-N4基团的指纹特征。而Co-N-C-700单原子催化剂边前...
The response consists of pre-edge (at 7712 eV) and bi-polar peak (up at 7727, down at 7731 eV) with amplitudes, respectively, less than 10~(-3) and 10~(-2) of the Co K-edge jump. Using the sum rule the orbital magnetic moment of 4p Co is evaluated. Its temperature dependence ...
which is the same as previously prepared MOF with random orientations. To confirm the vertical structure, we have taken SEM images of the edge of Ni foam (Supplementary Figure8). In Supplementary Figure8one can clearly see that Ni foam was well coated by CNWs, upon which MOF sheets are v...
In situ XAFS spectra were obtained to reveal the electronic state, geometric structure, and coordination environment of various TiO2−x/Ni samples. In terms of NiTi-MMO, the normalized Ni K-edge XANES (Fig. 2d) displays a higher white line and the adsorption edge shifts toward the higher ...
diatTehdesCame pL l3e-sedargee and Y shown K-edge XAFS (XANES and EXAFS) data for as supplementary information online. The χ the as-grown, annealed, and X-ray ranges used in Fourier transforms irra- are 2 to 9 Å−1 and 3 to 11.5 Å−1 for Ce and Y EXAFS ...
JOURNALOFCATALYSIS165,184–196(1997) ARTICLENO.CA971480 AMo–KEdgeXAFSStudyoftheMetalSulfide-SupportInteraction in(Co)MoSupportedAluminaandTitaniaCatalysts R.G.Leliveld,A.J.vanDillen,J.W.Geus,andD.C.Koningsberger DepartmentofInorganicChemistry,DebyeInstitute,UniversityofUtrecht,P.O.Box80083,3508TB...
We propose a mechanism of the magnetic circular X-ray dichroism (MCXD) at the pre-peak of the Fe K -edge in Fe-oxides. It is found that the hybridization b... I. Harada a,T. Suzuki b,A. Kotani b - 《Journal of Electron Spectroscopy & Related Phenomena》 被引量: 28发表: 1996年...
Mechanism for enhancing dispersion of Co3O4 nanoparticles in Co/SiO2 Fischer–Tropsch synthesis catalyst by adding glycol to impregnating solution: aquick-... In situ Co K-edge quick-EXAFS (QEXAFS) coupled with temperature-programmed oxidation as well as ex situ XAFS was applied to investigating...
Soft XAFS analyzes at O K-edge were conducted to elucidate O and Co species interactions. In the O K-edge XANES, a conspicuous decrease in the unoccupied O 2p-Co 3 d hybridized state (~530 eV; peak a) was evident in Ru-Co3O4 compared to Co3O4 (Fig. 2f)38,39, indicating ...
The accurate percentage of Co over oxidized Co can be obtained by analyzing the near absorption edge of XAFS spectra. In the case of untreated Co catalyst, pure Co could not be detected as it was below the detection limit and Co is found to exist mostly in the oxidized phase. However, ...