Phase Transformation of Needle-Like Fe-CoSe to Hexagonal Fe-CoO for Enhanced High-Current-Density Oxygen Evolution via Lattice Oxygen Redox.

CoFe layered double hydroxide (LDH) has emerged as a promising oxygen evolution reaction (OER) electrocatalyst but exhibits low intrinsic activity and instability at high current densities, limiting industrial applicability. Herein, a phase-engineering strategy is reported to derive highly crystalline phase-transformed hexagonal Fe-CoO (PH-FCO) via selenization of CoFe LDH to form Fe-CoSe, followed by electrochemical activation. Selective Se leaching during activation induces a morphological transition from needle-like Fe-CoSe to hexagonal PH-FCO.

Unraveling the surface self-reconstruction of Fe-doped Ni-thiophosphate for efficient oxygen evolution reaction.

Surface self-reconstruction of oxygen evolution reaction (OER) electrocatalysts generally occurs during the electrochemical activation process. Herein, we study the surface self-reconstruction of a 2D layered Fe-doped Ni-thiophosphate (NiFePS) nanosheet. The role of Fe in the surface self-reconstruction of NiPS during the OER is investigated by using an Raman analysis.

Recent advances in the biomolecules mediated synthesis of nanoclusters for food safety analysis.

The development of nanoclusters based on incorporating biomolecules like proteins, lipids, enzymes, DNA, surfactants, and chemical stabilizers creates a stable and high fluorescence bio-sensors promising future due to their high sensitivity, high level of detection and better selectivity. This review addresses a comprehensive and systematic overview of the recent development in synthesizing metal nanocluster by various strategized synthesis techniques. Significantly, the application of nanometal clusters for the detection of various food contaminants such as microorganisms, antibodies, drugs, pesticides, metal contaminants, amino acids, and other food flavors have been discussed briefly concerning the detection techniques, sensitivity, selectivity, and lower limit of detection.

Internal Thermal Stress-Driven Phase Transformation in Van der Waals Layered Materials.

High pressure or strain is an effective strategy for generating phase transformations in van der Waals (vdW) layered materials without introducing defects, but this approach remains difficult to perform consistently. We present a scalable and facile method for achieving phase transformation in vdW materials, wherein solid vdW materials are subject to internal thermal stress within a molten metal mantle as it undergoes cooling. This internal thermal stress is principally the product of differential thermal expansion between mantle and core and can be tuned by the mantle material and temperature conditions.

Atomic and structural modifications of two-dimensional transition metal dichalcogenides for various advanced applications.

Two-dimensional (2D) transition metal dichalcogenides (TMDs) and their heterostructures have attracted significant interest in both academia and industry because of their unusual physical and chemical properties. They offer numerous applications, such as electronic, optoelectronic, and spintronic devices, in addition to energy storage and conversion. Atomic and structural modifications of van der Waals layered materials are required to achieve unique and versatile properties for advanced applications.

Substitutional Vanadium Sulfide Nanodispersed in MoS Film for Pt-Scalable Catalyst.

Among transition metal dichalcogenides (TMdCs) as alternatives for Pt-based catalysts, metallic-TMdCs catalysts have highly reactive basal-plane but are unstable. Meanwhile, chemically stable semiconducting-TMdCs show limiting catalytic activity due to their inactive basal-plane. Here, metallic vanadium sulfide (VS ) nanodispersed in a semiconducting MoS film (V-MoS ) is proposed as an efficient catalyst.

Morphology restrained growth of VO by the oxidation of V-MXenes as a fast diffusion controlled cathode material for aqueous zinc ion batteries.

Herein, we report morphology controlled growth of layered VO on VC by the oxidation of V-MXenes at different temperatures and used it as a cathode material for Zn-ion batteries (ZIBs). Hence, the VO nanoparticles are uniformly grown on the VC nanosheets with interlinked disordered carbon which provide fast diffusion and high rate performance in aqueous zinc-ion batteries.

In situ grown nickel selenide on graphene nanohybrid electrodes for high energy density asymmetric supercapacitors.

Nickel selenide (NiSe) nanoparticles uniformly supported on graphene nanosheets (G) to form NiSe-G nanohybrids were prepared by an in situ hydrothermal process. The uniform distribution of NiSe on graphene bestowed the NiSe-G nanohybrid with faster charge transport and diffusion along with abundant accessible electrochemical active sites. The synergistic effect between NiSe nanoparticles and graphene nanosheets for supercapacitor applications was systematically investigated for the first time.