Deciphering the Underlying Mechanism of the Fourth Entity in Medium-Entropy NiCoFeMP toward Boosting Oxygen Evolution Electrocatalysis.

High-/medium-entropy materials have been explored as promising electrocatalysts for water splitting due to their unique physical and chemical properties. Unfortunately, state-of-the-art materials face the dilemma of explaining the enhancement mechanism, which is now limited to theoretical models or an unclear cocktail effect. Herein, a medium-entropy NiCoFeMnP with an advanced hierarchical particle-nanosheet-tumbleweed nanostructure has been synthesized via simple precursor preparation and subsequent phosphorization.

Breathable, Adhesive, and Biomimetic Skin-Like Super Tattoo.

Electronic tattoo, capable of imperceivably acquiring bio-electrical signals from the body, is broadly applied in healthcare and human-machine interface. Tattoo substrate, the foundation of electronic tattoo, is expected to be mechanically mimetic to skin, adhesive, and breathable, and yet remains highly challenging to achieve. Herein, the study mimics human skin and design a breathable, adhesive, and mechanically skin-like super tattoo substrate based on an ultra-thin film (≈2 µm).

Engineering a Ce Promoter into a Three-Dimensional Porous MoC@NC Heterostructure for Hydrogen Evolution Electrocatalysis via Weakening the Mo-H Bond Strength.

The pursuit of highly efficient electrocatalysts for the alkaline hydrogen evolution reaction (HER) is of paramount importance for water splitting. However, it is still a formidable task in MoC-based materials because of the agglomeration and strong Mo-H binding of MoC units. Herein, a novel CeOCl-CeO/MoC heterostructure nesting within a three-dimensional porous nitrogen-doped carbon matrix has been designed and used for catalyzing HER via simultaneous morphology and heterointerface engineering.

Mo-Doped LaFeO Gas Sensors with Enhanced Sensing Performance for Triethylamine Gas.

Triethylamine is a common volatile organic compound (VOC) that plays an important role in areas such as organic solvents, chemical industries, dyestuffs, and leather treatments. However, exposure to triethylamine atmosphere can pose a serious threat to human health. In this study, gas-sensing semiconductor materials of LaFeO nano materials with different Mo-doping ratios were synthesized by the sol-gel method.

Simultaneously Engineering Oxygen Defects and Heterojunction into Ho-Doped ZnO Nanoflowers for Enhancing -Propanol Gas Detection.

Lung cancer poses a serious threat to people's lives and health due to its high incidence rate and high mortality rate, making it necessary to effectively conduct early screening. As an important biomarker for lung cancer, the detection of -propanol gas suffers from a low response value and a high detection limit. In this paper, flower-like Ho-doped ZnO was fabricated by the coprecipitation method for -propanol detection at subppm concentrations.

Hollow Starlike Ag/CoMo-LDH Heterojunction with a Tunable d-Band Center for Boosting Oxygen Evolution Reaction Electrocatalysis.

It is a challenging task to utilize efficient electrocatalytic metal hydroxide-based materials for the oxygen evolution reaction (OER) in order to produce clean hydrogen energy through water splitting, primarily due to the restricted availability of active sites and the undesirably high adsorption energies of oxygenated species. To address these challenges simultaneously, we intentionally engineer a hollow star-shaped Ag/CoMo-LDH heterostructure as a highly efficient electrocatalytic system. This design incorporates a considerable number of heterointerfaces between evenly dispersed Ag nanoparticles and CoMo-LDH nanosheets.

Engineering Interfacial Built-in Electric Field in Polymetallic Phosphide Heterostructures for Superior Supercapacitors and Electrocatalytic Hydrogen Evolution.

Herein, a patterned rod-like CoP@NiCoP core-shell heterostructure is designed to consist of CoP nanowires cross-linked with NiCoP nanosheets in tight strings. The interfacial interaction within the heterojunction between the two components generates a built-in electric field that adjusts the interfacial charge state and create more active sites, accelerating the charge transfer and improving supercapacitor and electrocatalytic performance. The unique core-shell structure suppresses the volume expansion during charging and discharging, achieving excellent stability.

Heterostructure Interface Engineering in CoP/FeP/CeO with a Tailored d-Band Center for Promising Overall Water Splitting Electrocatalysis.

Accomplishing a green hydrogen economy in reality through water spitting ultimately relies upon earth-abundant efficient electrocatalysts that can simultaneously accelerate the oxygen and hydrogen evolution reactions (OER and HER). The perspective of electronic structure modulation via interface engineering is of great significance to optimize electrocatalytic output but remains a tremendous challenge. Herein, an efficient tactic has been explored to prepare nanosheet-assembly tumbleweed-like CoFeCe-containing precursors with time-/energy-saving and easy-operating features.

Development of TiO Nanosheets with High Dye Degradation Performance by Regulating Crystal Growth.

TiO nanosheets have been studied as photocatalysts in various fields, and their performance has been actively improved. Herein, we prepared titania nanosheets with a smaller size than those reported previously with a side length of 29 nm and investigated their photocatalytic activity. (NH)TiF and Ti(OBu) were used as raw materials, and the F/Ti ratio was varied in the range of 0.

Boosting Electrocatalytic Ammonia Synthesis of Bio-Inspired Porous Mo-Doped Hematite via Nitrogen Activation.

Electrochemical N reduction reaction (NRR) emerges as a highly attractive alternative to the Haber-Bosch process for producing ammonia (NH) under ambient circumstances. Currently, this technology still faces tremendous challenges due to the low ammonia production rate and low Faradaic efficiency, urgently prompting researchers to explore highly efficient electrocatalysts. Inspired by the Fe-Mo cofactor in nitrogenase, we report Mo-doped hematite (FeO) porous nanospheres containing Fe-O-Mo subunits for enhanced activity and selectivity in the electrochemical reduction from N to NH.

Coupling Plant Polyphenol Coordination Assembly with Co(OH) to Enhance Electrocatalytic Performance towards Oxygen Evolution Reaction.

The oxygen evolution reaction (OER) is kinetically sluggish due to the limitation of the four-electron transfer pathway, so it is imperative to explore advanced catalysts with a superior structure and catalytic output under facile synthetic conditions. In the present work, an easily accessible strategy was proposed to implement the plant-polyphenol-involved coordination assembly on Co(OH) nanosheets. A TA-Fe (TA = tannic acid) coordination assembly growing on Co(OH) resulted in the heterostructure of Co(OH)@TA-Fe as an electrocatalyst for OER.

Bending modulus of the rippled graphene: the role of thickness.

Bending modulus is a key parameter to characterize the stiffness of materials. Commonly, it is believed that the bending modulus is closely related to the thickness as described by the thin plate theory. However, the thin plate theory fails in multilayer van der Waals materials like multilayer graphene, suggesting a more complex relationship between the bending modulus and thickness.

Boosting Hydrogen Evolution Electrocatalysis via Regulating the Electronic Structure in a Crystalline-Amorphous CoP/CeO p-n Heterojunction.

The modulation of the electronic structure is the effective access to achieve highly active electrocatalysts for the hydrogen evolution reaction (HER). Transition-metal phosphide-based heterostructures are very promising in enhancing HER performance but the facile fabrication and an in-depth study of the catalytic mechanisms still remain a challenge. In this work, the catalytically inactive n-type CeO is successfully combined with p-type CoP to form the CoP/CeO heterojunction.

Boosting the oxygen evolution electrocatalysis of high-entropy hydroxides by high-valence nickel species regulation.

The addition of an extra metal source induces the transformation from crystalline α-Ni(OH) to an amorphous NiCoFeCrMo-based high-entropy hydroxide (HEH) and maximizes the high-valence Ni content in HEH. For OER electrocatalysis, the quinary HEH possesses an overpotential of 292 mV at 10 mA cm, a Tafel slope of 54.31 mV dec and the boosted intrinsic activity, surpassing other subsystems.

Cobalt Doped in Zn-MOF-5 Nanoparticles to Regulate Tumor Microenvironment for Tumor Chemo/Chemodynamic Therapy.

Metal-organic frameworks are often used as a chemotherapeutic drug carrier due to their diverse metal sites and good acid degradation ability. Herein Co-doped Zn-MOF-5 nanoparticles with a high Co doping rate of 60% were synthesized for chemo-chemodynamic synergistic therapy of tumor. Co ions can mediate chemodynamic therapy through Fenton-like reaction and regulate the tumor microenvironment by consuming the reduced glutathione.

Ammonium Salts: New Synergistic Additive for Chemical Vapor Deposition Growth of MoS.

Controllable and scalable fabrication is the precondition for realizing the large number of superior electronic and catalytic applications of MoS. Here, we report a new type of synergistic additives, ammonium salts, for chemical vapor deposition (CVD) growth of MoS. On the basis of the catalysis of ammonium salts, we can achieve layer and shape-controlled MoS domains and centimeter-scale MoS films.

Double-shelled carbon nanocages grafted with carbon nanotubes embedding Co nanoparticles for enhanced hydrogen evolution electrocatalysis.

Herein, small Co nanoparticles (NPs) encapsulated in N-doped double-shelled carbon nanocages grafted with thin carbon nanotubes (Co@CNTs@DSCNCs) were synthesized from yolk-shell bimetallic zeolitic imidazolate framework (BMZIF). For HER electrocatalysis, they exhibit higher activity (η = 214 mV) and more favorable kinetics than Co@CNTs@PC (PC = porous carbon) with thick CNTs and large Co NPs derived from solid BMZIF cubes.

Effect of ROS generation on highly dispersed 4-layer O-TiO nanosheets toward tumor synergistic therapy.

Ultra-thin two-dimensional nanosheets have attracted increasing attention due to their great application prospects in nanomaterial science and biomedicine. Herein, we report the preparation of exfoliated raw and oxidized 4-layer TiO (O-TiO) and their ability to produce reactive oxygen species (ROS). The results show that O-TiO nanosheets can effectively produce ROS induced by X-ray irradiation.

Surface Structure Engineering of Nanosheet-Assembled NiFeO Fluffy Flowers for Gas Sensing.

In this work, we present a strategy to improve the gas-sensing performance of NiFeO via a controllable annealing Ni/Fe precursor to fluffy NiFeO nanosheet flowers. X-ray diffraction (XRD), a scanning electron microscope (SEM), nitrogen adsorption-desorption measurements and X-ray photoelectron spectroscopy (XPS) were used to characterize the crystal structure, morphology, specific surface area and surface structure. The gas-sensing performance was tested and the results demonstrate that the response was strongly influenced by the specific surface area and surface structure.

Soft X-ray-Enhanced Reactive Oxygen Species Generation in Mesoporous Titanium Peroxide and the Application in Tumor Synergistic Therapy.

Mesoporous titanium peroxide TiO nanospheres with a high surface area are synthesized for the application of an advanced drug system. The mesoporous TiO nanospheres have a high specific surface area of 681.89 m/g and suitable pore size (∼3 nm) that can effectively upload doxorubicin (DOX) and possesses a high drug storage capacity of 146.

Synthesis of surfactant-modified ZIF-8 with controllable microstructures and their drug loading and sustained release behaviour.

Metal-organic frameworks (MOFs) as drug carriers have many advantages than traditional drug carriers and have received extensive attention from researchers. However, how to regulate the microstructure of MOFs to improve the efficiency of drug delivery and sustained release behaviour is still a big problem for the clinical application. Herein, the authors synthesise surfactant-modified ZIF-8 nanoparticles with different microstructures by using different types of surfactants to modify ZIF-8.

Up-converting nanoparticles synthesis using hydroxyl-carboxyl chelating agents: Fluoride source effect.

The synthesis of lanthanide doped up-converting nanoparticles (UCNPs), whose morphological, structural, and luminescence properties are well suited for applications in optoelectronics, forensics, security, or biomedicine, is of tremendous significance. The most commonly used synthesis method comprises decomposition of organometallic compounds in an oxygen-free environment and subsequent infliction of a biocompatible layer on the particle surface. In this work, hydroxyl-carboxyl (-OH/-COOH) type of chelating agents (citric acid and sodium citrate) are used in situ for the solvothermal synthesis of hydrophilic NaYGdF:Yb,Er UCNPs from rare earth nitrate salts and different fluoride sources (NaF, NHF, and NHHF).

SiO-coated magnetic nano-FeO photosensitizer for synergistic tumour-targeted chemo-photothermal therapy.

In this study, we integrated chemotherapy and photothermal therapy in a magnetically targeted doxorubicin-loaded FeO@SiO nanodrug system. Size-controllable magnetic FeO@SiO core-shell nanoparticles were synthesized via a solvothermal method and a modified Stǒber method. A molecular anticancer drug, namely, doxorubicin, was loaded onto FeO@SiO nanocomposites to form a magnetically targeted drug delivery system.

Cantharidin-loaded functional mesoporous titanium peroxide nanoparticles for non-small cell lung cancer targeted chemotherapy combined with high effective photodynamic therapy.

Background: Although photodynamic therapy (PDT) has emerged as a potential alternative to conventional chemotherapy, the low reactive oxygen species (ROS) yield of the photosensitizer such as TiO nanoparticles has limited its application. In addition, it is difficult to achieve effective tumor treatment with a single tumor therapy.

Methods: We used TiOx nanocomposite (YSA-PEG-TiO ) instead of TiO as a photosensitizer to solve the problem of insufficient ROS generation in PDT.

Direct Growth of Continuous and Uniform MoS Film on SiO/Si Substrate Catalyzed by Sodium Sulfate.

Because of its unique electronic band structure, molybdenum disulfide (MoS) has been regarded as a star semiconducting material. However, direct growth of continuous and high-quality MoS films on SiO/Si substrates is still very challenging. Here, we report a facile chemical vapor deposition (CVD) method based on synergistic modulation of precursor and NaSO catalysis, realizing the centimeter scale growth of a continuous MoS film on SiO/Si substrates.