(a) XRD pattern of the as-prepared Nb4AlC3–x. All identifiable peaks belonging to o-Nb4AlC3 and Nb4AlC3–x coincide. For the sake of conciseness, they are indexed with the cell of o-Nb4AlC3. (b) Change of diagonal distances of Nb (blue balls in the inset) in the carbon-vacant...
additional peaks observed in XRD measurements have been assigned to possible secondary phases18,21. Various stoichiometries including H2S16,23, HS224, H4S325, and H5S226have been proposed for materials with lowerTcs. Exotic Magnéli phases with HxS1−x(2/3 < x < 3/4) compositions...
new peaks appear during the sodiation/desodiation process, suggesting no intercalation of Na+into/from graphitic interlayers [33]. Along with the relationship between the sloping capacity andRvalue orID/IGratio (Figs.3b and S18), in situ XRD results further corroborate that the sloping capacity...
believed that the four-step potassium storage process is more reasonable, confirmed by the observed three pairs of redox peaks in the CV graph through the study of the electrochemical performance and kinetics of the graphite anode [22]. Accordingly, Fig. 4c presents a pronounced redox peak at ...
Considering now the voltammogram at low “SOC”/spgr, there is a notable of shift of peaks toward lower potentials and increase of current magnitude, similar observations are noted by Lander [18]. Fig. 4suggests that there are electrochemical differences between CON and dCNT-containing PAM ...
To further study the internal structure, the crystal phase characteristics of S/N-KCNFs, S-KCNFs, N-KCNFs, and CNFs are studied by X-ray diffraction (XRD) as shown in Fig. 5a. All four samples exhibit two distinct broad diffraction peaks at 26º and 43º, corresponding to the (...
The XRD results showed that the electrocatalysts consisted of the Pt displaced phase, suggesting the formation of solid solutions between the metals Pt/Ir and Pt/Sn. However, the increase in Sn loading promoted phase separation, with the formation of peaks typical of cubic PtSn. The ...
However, the XANES spectra of C60 and C70 show fine structures in both of the resonances, and most of the spectral positions of the observed peaks are in good agreement with a reported density-of-state (DOS) calculation. The XANES feature of K 3 C60 consists of the carbon K-edge and ...
Then, the photophysical properties of these CDs have been further investigated. As presented in Fig.2e, j, o, all the fluorescence peaks appear at around 670 and 720 nm under the excitation of 410 nm light. With the directly integrating sphere measurement, the PL QYs of CDs-1, CDs-...
(XRD) measurements were performed in a MiniFlex600 with Cu- Kα radiation. Ex-situ and in-situ X-ray absorption spectroscopy (XAS) data were collected at the 9BM beamline of the Advanced Photon Source (APS, Argonne National Laboratory, Lemont, Illinois). The XAS data were processed using ...