Cellulose/lignin-based carbon nanobelt aerogels coating on VSe2 nanosheets as anode for high performance potassium-ion batteries

Hybrid Nano Flake-like Vanadium Diselenide Combined on Multi-Walled Carbon Nanotube as a Binder-Free Electrode for Sodium-Ion Batteries

“…Figure 3 b displays the XPS V 2p spectrum of VSe 2 @MWCNT. Peaks located at 516.7 eV and 523.9 eV were attributable to V 2p 3/2 and V 2p 1/2 , respectively [ 41 , 42 ]. As shown in Figure 3 c, the Se 3d XPS spectrum exhibited 53.5, 54.3, 55.2 and 55.9 eV (Se 3d 5/2 and 3d 3/2 ).…”

Metal Selenides Find Plenty of Space in Architecting Advanced Sodium/Potassium Ion Batteries

“…They demonstrated that the integration with carbon improves the structural stability and does not affect the sodiation process. Furthermore, the sodiation storage mechanism through conversion and the alloying reaction was evidenced from XRD and XPS analysis and could be expressed as Equations (45)(46)(47). [168] The irreversible conversion reaction was also demonstrated by Aizaz Ud Din et al [169] Shen et al proposed that the employment of a Cu current collector facilitated the re-constructed process of the Bi 2 Se 3 nanosheet electrode, which was beneficial to buffer the volume expansion and improve the electrode stability.…”

“…Hybridizing with carbonaceous materials has been deemed as one of the sufficient conceptions to alleviate such plague. [47][48][49] Benefited from the inherent conductivity of VSe 2 , the improved conductivity and structural stability protection offered by the polypyrrole layer, VSe 2 @PPy nanoplates delivered an increased charge transfer rate and cushioned volumetric expansion. Consequently, it showed a satisfactory rate capability of 260 mAh g −1 at 10 A g −1 for SIBs and 148.6 mAh g −1 at 5 A g −1 for PIBs.…”

Rational construction of VSe2encapsulated in selenized polyacrylonitrile toward a high-rate capacity and wide temperature tolerance for potassium-ion batteries

“…1d exhibit two conspicuous peaks at around 273 and 400 cm −1 which may be respectively attributed to the E 2g and A 1g mode of VSe 2 . 24 Two small but distinctive peaks at 680 and 451 cm −1 were ascribed to the V-Se and Se-C bond vibrations. 22,38 The characteristic peak of pristine Se was observed at 230 cm −1 , corresponding to the chain-structured Se n .…”

“…[21][22][23] Nevertheless, carbon and selenide have fundamentally weak physical interactions. 24,25 Intermediate potassium polyselenides can still release and dissolve into the electrolyte. Furthermore, the presence of carbon material lessens the loading of active materials unnecessarily, limiting the actual energy density.…”