Identifying the origin and contribution of pseudocapacitive sodium ion storage in tungsten disulphide nanosheets for application in sodium-ion capacitors

Abstract

The pseudocapacitive Na ion storage behaviour of WS2 nanosheets was systematically investigated by various ex/in situ experimental analyses and theoretical calculations.

Carbon Nanosheet Anode for Sodium‐Ion Storage and Its Application in Sodium‐Ion Hybrid Capacitors

“…A high energy density of 135 Wh kg À 1 can be achieved at a power density of 250 W kg À 1 , and the device retains an energy density of 69 Wh kg À 1 at an ultrahigh power output of 25 kW kg À 1 . The energy/power densities of SIHCs are shown in Ragone plots (Figure 5c and d) and are superior to several representative materials-based devices such as 3D framework carbon//3D framework activated carbon (3DFC//3DFAC), [40] 3D carbon framework//sodium alginate derived AC (3DCF//SDAC), [39] TiO 2 mesocage graphene nanocomposite//AC (MWTOG//AC), [41] Nb 2 O 5 @carbon core-shell nanoparticles/reduced graphene oxide//AC (Nb 2 O 5 @C/rGO-50// AC), [42] nanotube-like hard carbon//activated polyaniline-derived carbon (NTHC-1150//APDC), [43] WS 2 nanosheets//mesoporous hollow carbon spheres (WS 2 nanosheets//m-HC) [44] and TiO 2 @CNT@C nanorods//biomass-derived activated carbon (TiO 2 @CNT@C// BAC). [45] To further illustrate the feature of devices, Figures 5e, S8 and S9 displayed the cycling stability at the current density of 2 A g À 1 .…”

One-pot resource-efficient synthesis of SnSb powders for composite anodes in sodium-ion batteries

“…[1][2][3][4] For the last few years the search for more abundant and lower cost energy storage has stimulated an inux of research into rechargeable sodium ion batteries. [5][6][7][8][9][10][11] Based on the wide availability and low cost of sodium, sodium ion batteries offer the potential for meeting large scale grid energy storage needs. However, sodium ion batteries usually exhibit lower specic capacity, poorer cycling durability and rate capability due to the much larger ionic radius of Na + (102 pm) as compared to Li + (76 pm).…”

Emerging Materials for Sodium-Ion Hybrid Capacitors: A Brief Review

“…Similarly, NICs based on nanoarchitecture metal oxide anodes exhibited a high pseudocapacitive sodium-ion storage, with Na 2 Ti 3 O 7 @CNT coaxial nanocables (52.7% contribution), MoP nanograins (75% contribution), N-doped porous carbon embedded with ultrasmall titanium oxynitride nanoparticles (76% contribution), sub-10 nm SnO 2 nanocrystals (86% contribution), 2D mesoporous carbon@TiO 2 @carbon vertical heterostructures (96.4% contribution), and FeVO 4 ·0.6H 2 O nanowires (96% contribution) and showed a remarkable energy retention under high power conditions. − Another strategy to improve the pseudocapacitance is increasing the layer spacing in an oxide cathode. Enlarged interlayers with a stabilized layer structure can facilitate facile ion diffusion to achieve an excellent rate behavior and stability.…”

“…The tailoring of sulfide-based anodes to ultrathin nanostructures can render a fast surface-dominated redox reaction in sulfide anodes. Several tailored nanostructures, such as WS 2 nanosheets (58% contribution), layer-by-layer stacked VS2 nanosheets (69% contribution), few layered SnS 2 (75% contribution), Co 9 S 8 /ZnS nanocrystals in hollow N-doped carbon nanosheets (90.3% contribution), MnCo 2 S 4 Nanourchin (94.1% contribution), and SnS nanohoneycomb (95% contribution), have delivered a remarkably higher pseudocapacitance than their oxide counterparts. ,,− Sulfide anodes possess a larger discharge capacity than their oxide counterparts in an NIB system, and thus the energy output of sulfide-based NICs is higher than that of oxide-based NICs. An electrode material with a nanosized 3D architecture, high electronic conductivity, and large electrode–electrolyte contact area exhibits a larger pseudocapacitance than bulk-sized electrodes.…”