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Utilizing oxygen functional groups, interfacial reactions were carried out on the surface of natural stibnite, resulting in the formation of Sb2S3/Sb core–shell structure and sulfur-doped carbon matrix with improved sodium-storage capabilities.

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Engineering interfacial properties of metal-sulfides toward excellent electrochemical capability is imperative for advanced energy-storage materials. However, they still suffer from an unclear mechanism of capacity fading, along with ineffective physical-chemical evolution. Herein, a highly-effective Sb 2 S 3 with double carbon is designed with interfacial SbC bonds and double carbon, which boosts promoting of ion transferring and alleviates the separation of both active phases (Sb, S). Through "voltage-cutting" manners, the key elements of capacity improvement about phase transitions are further determined. As expected, even at 5.0 A g −1 , the lithium-storage capacity remains about 674 mAh g −1 . Utilized as sodium ion battery (SIB) anode, the rate capacity still reaches up to 366 mAh g −1 at 3.0 A g −1 , much larger than that of Sb 2 S 3 . Obtaining the full cell of Ni-Fe Prussian blue analog versus M-Sb 2 S 3 @DC, the reversible capacity is 330 mAh g −1 at 0.5 A g −1 . Supported by kinetic analysis, the excellent rate properties are determined by the surface-controlling behaviors, mainly resulting from the decreased capacitive resistance and improved ion moving. Furthermore, the reassembling evolution of active phases is revealed in detail by ex situ techniques. This work is expected to offer significant insights into interfacial evolutions toward advanced energy-storage systems.

In this work, we report elastocaloric effect (eCE) in Ni-Fe-Ga polycrystalline alloys. By application of a uniaxial compressive stress of 170 MPa at 298 K, a large and recoverable temperature change of 4 K has been obtained in precipitates-containing Ni54Fe19Ga27 alloys. The degradation of eCE is insensitive to 100 loading-unloading cycles. In comparison, the loss of mechanical integrity occurs in the single-phase alloy suffering from only 10 superelastic cycles, implying a short fatigue life. Good mechanical properties, large and equivalent adiabatic temperature change (ΔT) under loading-unloading cycle render dual-phase Ni-Fe-Ga promising candidate materials for solid-state mechanical cooling application at ambient conditions.

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