Stability is one of the major issues for hybrid organic− inorganic halide perovskites. In the organic aspect, increased hydrophobicity can be beneficial to the enhanced stability. Different from the previous R group hydrophobic modification in an organic R-NH 3 + cation, herein, NH 3 + modification using epoxide is reported to improve the stability of hybrid halide perovskites. We integrate the chiral propylene oxide (PO) into HDAPbI 4 (HDA = 1,6-hexamethylenediamine) through the grafting of PO onto HDA. The −NH 3 + hydrophobic modification is very favorable for stability improvement. As a result, the resultant (R/S-PO-HDA)PbI 4 thin film is stable in water for more than 1 h, whereas the untreated HDAPbI 4 thin film decomposes immediately. Moreover, (R/S-PO-HDA)PbI 4 could keep the photoelectricity of HDAPbI 4 and the chirality of PO. This work could inspire further study on the perovskite-based epoxide polymer.
A promising anode material consisting of bimetallic thiophosphate ZnxCo1−xPS3 and CoS2 with 2D/3D heterostructure is designed and prepared by an effective chemical transformation. Density functional theory calculations illustrate that the Zn2+ can effectively modulate the electrical ordering of ZnxCo1−xPS3 on the nanoscale: the reduced charge distribution emerging around the Zn ions can enhance the local built‐in electric field, which will accelerate the ions migration rate by Coulomb forces and provide tempting opportunities for manipulating Li+ storage behavior. Moreover, the merits of the large planar size enable ZnxCo1–xPS3 to provide abundant anchoring sites for metallic CoS2 nanocubes, generating a 2D/3D heterostructure with a strong electric field. The resultant ZnxCo1−xPS3/CoS2 can offer the combined advantages of bimetallic alloying and heterostructure in lithium storage applications, leading to outstanding performance as an anode material for lithium‐ion batteries. Consequently, a high capacity of 794 mA h g−1 can be retained after 100 cycles at 0.2 A g−1. Even at 3.0 A g−1, a satisfactory capacity of 465 mA h g−1 can be delivered. The appealing alloying‐heterostructure and electrochemical performance of this bimetallic thiophosphate demonstrate its great promise for applications in practical rechargeable batteries.
The exploration of advanced anode materials through rational structure/phase design is the key to developing high-performance rechargeable batteries. Herein, tetraphosphorus tetraselenide (Se 4 P 4 ) nanoparticles confined within porous carbon (named SeP@C) are developed for lithiumion batteries. The designed SeP@C shows a set of structural/compositional advantages as lithium-ion battery anodes including high electrical conductivity, low ion diffusion barrier, and relieved lithiation stress. Consequently, the SeP@C electrode displays superior comprehensive lithium storage performance, e.g., high reversible capacity (640.8 mA h g −1 at 0.1 A g −1 ), excellent cycling stability (500 cycles with respective capacity retention of over or nearly 100%), and good rate capability, representing a comparable lithium storage performance in reported phosphide-based anodes. More significantly, it shows excellent energy storage properties in lithium-ion full cells which can light up 85 red LEDs for over 3.2 h. This work offers an advanced electrode construction guidance of phosphorous-based anodes for the development of high-performance energy storage devices.
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