In-situ construction of edge site-enriched VS4/graphene hybrids toward high-performance lithium storage

Morphology Engineering of VS4 Microspheres as High-Performance Cathodes for Hybrid Mg2+/Li+ Batteries

“…The result is consistent with the above Raman analysis. In the S 2p XPS spectra of the three VS 4 microspheres (Figure e), it can be clearly observed that the two fitting peaks that appeared at 162.4 and 163.6 eV are related to S 2p 3/2 and S 2p 1/2 of S 2 2– dimers . The C 1s XPS spectra of VS 4 microspheres are presented in Figure f.…”

“…XRD was carried out to probe the phase structure of the as-synthesized samples. As displayed in Figure a, all diffraction peaks of VS 4 @NC-2, VS 4 @NC-5, and VS 4 @NC-8 can be well indexed to the monoclinic phase VS 4 (PDF#87-0603), and there are no impurity phases observed. ,, When HCl is not added during the solvothermal process, only the monoclinic VS 4 phase can be observed in the XRD pattern of VS 4 @NC (Figure S1). Li et al .…”

“…As displayed in Figure 3a, all diffraction peaks of VS 4 @NC-2, VS 4 @NC-5, and VS 4 @NC-8 can be well indexed to the monoclinic phase VS 4 (PDF#87-0603), and there are no impurity phases observed. 26,28,41 When HCl is not added during the solvothermal process, only the monoclinic VS 4 phase can be observed in the XRD pattern of VS 4 @NC (Figure S1). Li et al 38 reported that TAA can hydrolyze to generate H 2 S by adding different amounts of HCl during the solvothermal process (eq 1), which will produce large microreaction pressure in favor of the formation of the as-prepared VS 4 microspheres to some extent.…”

“…In the S 2p XPS spectra of the three VS 4 microspheres (Figure 3e), it can be clearly observed that the two fitting peaks that appeared at 162.4 and 163.6 eV are related to S 2p 3/2 and S 2p 1/2 of S 2 2− dimers. 41 The C 1s XPS spectra of VS 4 microspheres are presented in Figure 3f. The peaks located at about 284.7, 286.3, and 288.7 eV can be attributed to C−C, C−N, and C� O bonds, respectively.…”

“…The oxidation of VS 4 takes place in the range of 200−400 °C. 41 According to the weight loss between 400 and 550 °C, the carbon content of VS 4 @NC-5 is determined to be 7.78%. 39 The TG analysis is consistent with the Raman spectra and electrochemical tests.…”