Prussian Blue@MoS₂Layer Composites as Highly Efficient Cathodes for Sodium‐ and Potassium‐Ion Batteries

Abstract

Prussian blue (PB) represents a simple, economical, and eco-friendly system as cathode material for sodium-ion batteries (SIBs). However, structural problems usually worsen its experimental performance thus motivating the search for alternative synthetic strategies and the formation of composites that compensate these deficiencies. Herein, a straightforward approach for the preparation of PB/MoS 2 -based nanocomposites is presented. MoS 2 provides a 2D active support for the homogeneous nucleation of porous PB nanocrystals, which feature superior surface areas than those obtained by other methodologies, giving rise to a compact PB shell covering the full flake. The nanocomposite exhibits an excellent performance as cathode for SIBs with discharge capacity values up to 177 mA h g −1 and a specific capacitance of 354 F g −1 . These values are even larger for the intercalation of K + ions (up to 215 mA h g −1 , reaching a specific capacitance of 489 F g −1 ). Compared to similar composites, superior performance can be ascribed to a synergistic effect of the coordination compound with the 2D material.

Few‐Layered Tin Sulfide Nanosheets Supported on Reduced Graphene Oxide as a High‐Performance Anode for Potassium‐Ion Batteries

“…However, their low specific capacity (around 200 mAh g −1 ) and high average operating voltage (>0.5 V) limit the energy density of PIBs . Very recently, some noncarbonaceous anodes based on conversion/alloying mechanisms have been explored for K storage, exhibiting increased specific capacity compared with the carbonaceous materials . Among them, Sn‐based compounds (e.g., Sn 4 P 3 , SnS 2 ) combining the conversion and alloying reactions are expected to be promising anode candidates due to their high theoretical specific capacities .…”

WS2/MoS2 Heterostructures through Thermal Treatment of MoS2 Layers Electrostatically Functionalized with W3S4 Molecular Clusters

“…To prepare the WS 2 /MoS 2 heterostructures, we used [W 3 S 4 (tu) 8 (H 2 O)]Cl 4 ⋅ 2 H 2 O clusters (in short W 3 S 4 cluster; tu=thiourea, Figure b) as the molecular source of WS 2 and ultrathin MoS 2 flakes (1–5 nm thick and 0.2–1.2 μm wide) produced by chemical exfoliation with n ‐butyllithium ( n BuLi) as the underlying substrate. Even though the synthesis and thermal decomposition of W 3 S 4 cluster into WS 2 layers was reported in 2016, the study of the morphology of the decomposition product has remained elusive until now.…”

“…Solvents were used without further purification. Ultrathin ce‐MoS 2 layers and W 3 S 4 clusters were prepared according to the strategies described by some of us in references and , respectively.…”

N‐Doped Carbon‐Coated Ni1.8Co1.2Se4Nanoaggregates Encapsulated in N‐Doped Carbon Nanoboxes as Advanced Anode with Outstanding High‐Rate and Low‐Temperature Performance for Sodium‐Ion Half/Full Batteries

“…Rechargeable lithium‐ion batteries (LIBs) are the most successful secondary batteries in the current development, having high capacity, high voltage, long cycle life, no memory effect, and other advantages, which are regarded as one of the most promising chemical power supplies at present . However, with the development of science and technology and people's increasing demand for energy, it is very difficult for LIBs to meet the urgent needs of future energy storage . In recent years, sodium‐ion batteries (SIBs) have attracted more and more attention as potential candidates for stationary storage system alternatives to the market‐dominant LIBs, owing to the highly abundant, low cost, and geographically even‐distributed sodium resources in the Earth's crust, as well as its environmental friendliness and the identical working mechanism as LIBs .…”