CoSe₂/MoS₂ Heterostructures to Couple Polysulfide Adsorption and Catalysis in Lithium‐Sulfur Batteries^†

Abstract

Lithium-sulfur batteries have been regarded as one of most promising next-generation energy storage devices because of their high energy density and low cost. However, polysulfide shuttling and slow kinetics hinder the practical application. We fabricated hierarchically heterostructured CoSe 2 /MoS 2 nanoarrays on carbon clothes as the sulfur cathode host. The resulting heterostructures facilitate electron conduction and improve electrolyte wetting. More importantly, the composite heterostructures couple the strong polysulfide adsorption of CoSe 2 and high catalytic activity of MoS 2 to synergistically accelerate polysulfide conversion, demonstrating higher catalytic activity than their individual components.

Rational engineering of VS4 nanorod array on rose-shaped VS2 nanosheets for high-performance aluminium-ion batteries

“…Faced with increasing environmental issues and fossil energy consumption, the development of new-energy technologies has been of great significance. 1–3 Li-ion batteries currently dominate the energy-storage markets; however, the high cost, safety issues, and highly toxic and flammable organic electrolytes have caused many concerns. 4,5 In some electrochemical systems, the theoretical gravimetric and volumetric capacities of Al-ion batteries are as high as 2980 mA h g −1 and 8064 mA h cm −3 .…”

CrP Nanocatalyst within Porous MOF Architecture to Accelerate Polysulfide Conversion in Lithium–Sulfur Batteries

“…After 24 h, the electrolyte containing C showed a dark red color similar to the initial Li 2 S 4 solution whereas CrP@MOF turned the electrolyte transparent. 45,46 Cr 2 O 3 decolored the electrolyte more than Super P and less than CrP@MOF. Furthermore, the UV−vis spectrum in Figure 4a confirms the trend.…”

Spontaneous Built‐In Electric Field in C3N4‐CoSe2 Modified Multifunctional Separator with Accelerating Sulfur Evolution Kinetics and Li Deposition for Lithium‐Sulfur Batteries

“…[25][26][27][28] Furthermore, CoSe 2 can also reduce the nucleation barrier of Li 2 S and promote the uniform deposition of Li 2 S due to its excellent catalytic activity. [29][30][31][32] In particular, the CoSe 2 derived from ZIF-67 can provide abundant catalytic active sites for the conversion of LiPSs and contribute to the realization of high-sulfur loaded LSBs. [26,29,33] Unfortunately, such CoSe 2 electrocatalysts are anchored to a 3D porous carbon framework and composed of many discontinuous nanoparticles, which are easy to agglomerate or even break up during continuous charge and discharge process.…”