CsAgBiBr and related Halide double perovskite porous single crystals.

The utilization of single crystals is exponentially growing in optoelectronic devices due to their exceptional benefits, including high phase purity and the absence of grain boundaries. However, achieving single crystals with a porous structure poses significant challenges. In this study, we present a method for fabricating porous single crystals (porous-SC) of CsAgBiBr and related halide double perovskites using an infrared-assisted spin coating technique.

Correction: 3D-engineered WO microspheres assembled by 2D nanosheets with superior sodium storage capacity.

[This corrects the article DOI: 10.1039/D4RA01800A.].

3D-engineered WO microspheres assembled by 2D nanosheets with superior sodium storage capacity.

Because of the inadequate sodium storage capacity of graphite, the exploration of high-performance SIB anodes is a crucial step forward. Herein, we report the hydrothermally synthesized self-assembled interconnected nanosheets of WO microspheres possessing admirable sodium storage in terms of cycling stability and acceptable rate capability. Benefitting from the interconnected nature of the nanosheets with a hollow interior, the WO microspheres exhibited a high sodiation capacity of 431 mA h g at 100 mA g and an excellent rate performance of 60 mA h g at 500 mA g with an impressive coulombic efficiency of around 99%.

Whispering gallery mode micro-lasing in CsPbI quantum dots coated on TiO microspherical resonating cavities.

Whispering gallery mode (WGM) lasing in CsPbI quantum dots (QDs) coated on TiO spherical microcavities is demonstrated. The photoluminescence emission from a CsPbI-QDs gain medium strongly couples with a TiO microspherical resonating optical cavity. Spontaneous emission in these microcavities switches to a stimulated emission above a distinct threshold point of 708.

Aluminium substitution in SbS nanorods enhances the stability of the microstructure and high-rate capability in the alloying regime.

Alloy anodes, with twice the capacity of graphite, are promising for next-generation lithium-ion batteries (LIBs). However, poor rate-capability and cycling stability, mainly due to pulverization, have limited their application. By constraining the cutoff voltage to the alloying regime (1 V to 10 mV Li/Li), we show that SbAlS nanorods provide excellent electrochemical performance, with an initial capacity of ∼450 mA h g and excellent cycling stability with 63% retention (capacity ∼240 mA h g after 1000 cycles at 5C-rate), unlike 71.