High‐Entropy Prussian Blue Analogues and Their Oxide Family as Sulfur Hosts for Lithium‐Sulfur Batteries

Abstract

The introduction of high-entropy into Prussian blue analogues (PBAs) has yet to attract attention in the field of lithium-sulfur battery materials. Herein, we systematically synthesize a library of PBAs from binary to high-entropy by a facile coprecipitation method. The coordination environment in PBAs is explored by X-ray absorption fine structure spectroscopy, which together with elemental mapping confirm the successful introduction of all metals. Importantly, electrochemical tests demonstrate that high-entropy PBA can serve as polysulfide immobilizer to inhibit shuttle effect and as catalyst to promote polysulfides conversion, thereby boosting its outstanding performance. Additionally, a variety of nanocubic metal oxides from binary to senary are fabricated by using PBAs as sacrificial precursors. We believe that a wide range of new materials obtained from our coprecipitation and pyrolysis methodology can promote further developments in research on PBA systems and sulfur hosts.

Ordered Mesoporous Carbon Grafted MXene Catalytic Heterostructure as Li-Ion Kinetic Pump toward High-Efficient Sulfur/Sulfide Conversions for Li–S Battery

“…The Q 1 and Q 2 are defined as the capacity of the first and second discharge plateaus, respectively, an index to evaluate the utilization of sulfur species. 53 In this situation, the ratio of Q 2 /Q 1 can reflect the catalytic activity of the electrode toward the LiPSs conversion reaction. The higher ratio of Q 2 /Q 1 indicates the higher catalytic activity.…”

“…Note that the battery with OMC- g -MXene/PP exhibits the smallest polarization potential (Δ E = 140 mV) (Figure B). The Q 1 and Q 2 are defined as the capacity of the first and second discharge plateaus, respectively, an index to evaluate the utilization of sulfur species . In this situation, the ratio of Q 2 / Q 1 can reflect the catalytic activity of the electrode toward the LiPSs conversion reaction.…”

Embedding Atomically Dispersed Iron Sites in Nitrogen‐Doped Carbon Frameworks‐Wrapped Silicon Suboxide for Superior Lithium Storage

“…SiO x /Fe–N–C possessed the strongest adsorption ability, which was consistent with the highest discharge capacity. [ 47 , 48 ] In addition, the DOS calculation was employed to investigate the electrical conductivity (Figure 4j ). The introduction of Fe–N–C significantly improved the conductivity of SiO x resulting from the largest density difference at Fermi level.…”

Rational Design and General Synthesis of High-Entropy Metallic Ammonium Phosphate Superstructures Assembled by Nanosheets

“…In recent years, high-entropy nanomaterials (HEMs) have aroused rising attention because of their highly diverse structures and tailor-made components. − A great quantity of HEMs including alloys and metal-based compounds have been reported in a wide range of utilizations, such as thermoelectricity applications, various catalytic systems, and electrochemical energy storage. , For instance, Du et al introduced HE into Prussian blue analogues and applied them in the field of lithium sulfur batteries. HE carbonitride MXene synthesized by Yang et al showed good adsorption and catalytic ability for lithium polysulfide.…”