Ternary molybdenum sulfoselenide based hybrid nanotubes boost potassium-ion diffusion kinetics for high energy/power hybrid capacitors

Abstract

<p>MoS_2−xSe_x/carbon hybrid nanotubes with expanded interplanar spacing could deliver a reversible capacity of 237.0 mA h g⁻¹ after 300 cycles at 0.5 A g⁻¹ for PIBs, and an energy density of 44.1 W h kh⁻¹ at a power density of 15 414 W kg⁻¹ in a K⁺ hybrid capacitor.</p>

Carbon-coated MoS1.5Te0.5 nanocables for efficient sodium-ion storage in non-aqueous dual-ion batteries

“…Nevertheless, MoS 2 also faces several critical issues including low electronic conductivity, possible aggregation of MoS 2 nanosheets, and considerable volume variations upon repeated charge–discharge process, which greatly restrict their electrochemical performance 14 – 16 . Recently, anion doping has been reported as a promising method to modify the physicochemical properties of nanomaterials and thereby potentially improve the associated electrochemical performance 17 – 20 . Tellurium (Te) element, as one member of the chalcogens group, has a lower electronegativity and forms more polarizable ions than S thanks to its larger atomic radius and enhanced shielding effect, which makes the valence electron of the Te atom less restrained by the nuclear charge 21 .…”

In‐Depth Mechanism Understanding for Potassium‐Ion Batteries by Electroanalytical Methods and Advanced In Situ Characterization Techniques

“…Upon getting the relaxation information of the electrode process over-potential and then the reaction kinetic information can be inferred and calculated. [16] Meanwhile, a swathe of innovative in situ electrochemical hyphenated characterization techniques has been established. [17] In situ technique, as its name implies, detects the intermediate state during the chemical process in real operating condition.…”

Ultrafast and Ultrastable Heteroarchitectured Porous Nanocube Anode Composed of CuS/FeS2 Embedded in Nitrogen‐Doped Carbon for Use in Sodium‐Ion Batteries

“…Various metal sulfides have been gained attention as conversion‐based anode materials owing to their superior specific capacities, redox reversibility, and reaction kinetics compared to their oxide counterparts. [ 5,9–12 ] Most metal sulfide anodes undergo reversible conversion reactions with sodium ions, as expressed in Equation (): where M denotes a transition metal, such as Cu, Fe, Ni, Mo, and Ti. According to Equation (), one mole of sulfur in metal sulfides (M y S x ) undergoes electrochemical reactions with two moles of sodium ions, thereby making the theoretical capacity of metal sulfides considerably higher than that of intercalation‐based anode materials.…”