Facile and High‐Efficient Synthesis of High‐Performance Supercapacitor Electrode Materials Based on the Synergistic Intercalation and Oxidation of Layered Tungsten Disulfide

Abstract

The electrochemical performance of tungsten oxide (WO3) is closely related to its morphology and lattice symmetry. However, current synthetic approaches are typically limited by product controllability, environmental friendliness, and low scalability. Here, a facile and high‐efficient synthesis is reported of WO3 nanosheets based on the synergistic intercalation and oxidation of layered tungsten disulfide (WS2). The complete conversion from WS2 to WO3 is confirmed by crystallographic, spectroscopic, microscopic, and elemental analysis. The prepared WO3 nanosheets exhibit a superior specific capacitance of 480 F g−1 at a current density of 1 A g−1 and a good cycling stability at a current density of 10 A g−1. Notably, benefitting from the 2D nanosheet structure and the high lattice symmetry, the cubic WO3 nanosheets possess a high specific capacitance of 384 F g−1 at a high current density of 20 A g−1, which is much higher than that of other WO3‐based electrode materials.

Confinedly growing and tailoring of Co3O4 clusters-WS2 nanosheets for highly efficient microwave absorption

“…Recently, transition metal disulfides, especially tungsten disulfide (WS 2 ) with S-W-S layers combined by weak van der Waals force, have received extensive attention due to their unique electrical, optical and mechanical properties applied in catalysis [32], energy storage [33], supercapacitors [34], etc. Ultra-thin WS 2 nanosheets can be used as EM wave absorbing materials, due to its high specific surface area, aggregation defects, nanoscale properties such as size effects, surface and boundary effects [35].…”

Improving the Photocatalytic Activity of Mesoporous Titania Films through the Formation of WS2/TiO2 Nano-Heterostructures

“…On the contrary, the two sharp bands at ~422.0 and 352.5 cm −1 , attributed to the first-order A 1 g and E 2 g modes of WS 2 , are only present in WS 2 -TiO 2 films, suggesting the successful incorporation of WS 2 platelets into the titania layers. Interestingly, no signals were detected from the O-W-O stretching in the range of 750–900 cm −1 [ 31 ], indicating that the N 2 flow can effectively avoid the oxidation of WS 2 samples during the thermal annealing of the titania films.…”

Synthesis and applications of WO3 nanosheets: the importance of phase, stoichiometry, and aspect ratio

“…9b . 77 During the intercalation process, WS 2 converts to WOCl 4 which easily hydrolyses in water to hydrated WO 3 (WO 3 ·H 2 O). After annealing in air at 250 °C, cubic WO 3 nanosheets were formed that were 3–5 nm thick on average.…”