The performance of an ASC with CoTe as the positive electrode can be enhanced by introducing redox additive K4Fe(CN)6 into the alkaline electrolyte.

Li has garnered enormous attention for next-generation Li metal batteries owing to its remarkable theoretical capacity. Unfortunately, as an anode, Li suffers from serious safety issues and fast capacity fading due to the formation of Li dendrites, which hinders the practical application of Li anode. Herein, a LiAlO 2 -PVDF composite modification layer is fabricated on the surface of Li metal to enhance its stability and electrochemical performance. Benefitting from the synergetic effects of high Li + conductivity, high Li + transference number, excellent mechanical properties, superior chemical durability, and compactness of the modification layer, the LiAlO 2 -PVDF@Li electrode delivers an ultra-long lifespan and a high capacity retention rate in the LiAlO 2 -PVDF@Li│LiFePO 4 full cell. The proposed strategy provides a new alternative anode for Li metal batteries with high performance and scalable production.

With the ever frequent of industrial organic solvent emissions and oil spillages, the development of high efficiency oil/water separation materials has attracted extensive attention. Here, PLA‐based nanofiber membranes modified with metal oxides (SiO2, TiO2, Al2O3, and CeO2) are fabricated through blow spinning the mixed solution of polylactic acid (PLA) and metal oxide nanoparticles (NPs). Results shows that the addition of SiO2 NPs significantly increases the hydrophobicity of the membranes, while maintaining the excellent superoleophilicity. The PLA/SiO2 nanofiber membranes demonstrate a higher separation performance than pure PLA, PLA/TiO2, PLA/Al2O3, and PLA/CeO2 nanofiber membranes with high separation efficiency (~100%) and permeation flux (17,800 L m−2 h−1 for n‐heptane), as well as prominent oil adsorption capacity (19.9 g/g for n‐hexane). The successful fabrication of metal oxides modified PLA nanofiber membranes with high separation and adsorption ability, and excellent durability hold great application potential in the field of oily wastewater treatment.

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NiTe/NiSe composites grown in situ on Ni foam are successfully developed as a binder‐free electrode for supercapacitors. The as‐obtained NiTe/NiSe composite electrode exhibits excellent electrochemical properties with a higher specific capacitance of 1868 F g−1 (5.60 F cm−2) at a current density of 1 A g−1. In addition, an asymmetric supercapacitor is fabricated with NiTe/NiSe as the positive material and active carbon (AC) as the negative material. The resulting NiTe/NiSe//AC device exhibits a high energy density of 33.7 Wh kg−1 at a power density of 800 W kg−1, providing good cycling performance that retained 86.2 % of the initial capacitance at 2 A g−1 after 5000 cycles. All of the results illustrate that the NiTe/NiSe electrode is promising for potential application in supercapacitors and other fields.

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A NiSe/ZnSe (NZSe) hybrid nanostructure was fabricated via the coelectrodeposition method on nickel foam substrate as a binder-free electrode for asymmetric supercapacitors. The Ni/Zn ratio has a great impact on the morphologies and electrochemical properties of NZSe composites. Under an optimal Ni/Zn ratio, the resultant NZSe hybrid electrode exhibits excellent electrochemical performance with a high specific capacity of 651.5 mAh g–1 at 1 A g–1, which is noteworthy higher than that of pure NiSe (267.5 mAh g–1) and ZnSe (211.1 mAh g–1) at the same current density. Moreover, the NZSe electrode exhibits a satisfying cyclic stability of 2000 cycles (97.6% retention of its initial capacity value). The noticeable performance improvement is attributable to the synergetic effect of NiSe and ZnSe, and the unique hierarchical nanostructure of NZSe also plays an essential role in providing high conductivity, rich redox reactions, short ion diffusion, and efficient charge transport. An asymmetric supercapacitor assembled by utilizing the NZSe hybrid electrode as a positive electrode and active carbon (AC) electrode as the negative electrode delivers a high specific energy of 44.4 Wh kg–1 and superior cycling stability (98.7% capacitance retention after 10 000 cycles).

Preparation of electrode materials with rich redox peaks, fast ion-passage channels, and excellent cycling stability through a cost-effective process is vitally important for supercapacitors (SCs). In this work, we successfully fabricated a bimetallic selenide NiFe2Se4 through a simple and low-cost electrodeposition method. The resulting NiFe2Se4 electrode prepared at an optimized condition delivers a high specific capacity (372.2 mAh g–1 at 1 A g–1) and desirable cycling stability. Besides, the assembled NiFe2Se4//AC asymmetric supercapacitor (ASC) achieves a high operating voltage (1.6 V) with a maximum energy density of 45.6 Wh kg–1 and an outstanding cycling stability (maintains 101.4% of its original capacitance value after 10 000 cycles). Owing to the superior electrochemical performance, the NiFe2Se4//AC ASCs can light up a red light-emitting diode (LED) for real-time application.