Abstract Production of hydrogen by electrochemical water splitting has been hindered the high cost precious metal catalysts, such as Pt, for evolution reaction (HER). In this work, novel hierarchical β‐Mo 2 C nanotubes constructed from porous nanosheets have fabricated and investigated a high‐performance low‐cost electrocatalyst HER. An unusual template‐engaged strategy utilized to controllably synthesize Mo‐polydopamine nanotubes, which are further converted into direct carburization at...

Hierarchical NiCo₂O₄tetragonal microtubes prepared by a self-supported chemical transformation process exhibit an excellent electrochemical performance.

Development of low‐cost, high‐performance, and bifunctional electrocatalysts for water splitting is essential renewable clean energy technologies. Although binary phosphides are inexpensive, their performance not as good noble metals. Adding a third metal element to (Ni‐P, Co‐P) provides the opportunity tune crystalline electronic structures thus electrocatalytic properties. Here, ternary phosphide (NiCoP) films with different nickel cobalt ratios via an electrodeposition technique...

Hierarchical Fe3 O4 hollow spheres constructed by nanosheets are obtained from solvothermally synthesized Fe-glycerate spheres. With the unique structural features, these hierarchical exhibit excellent electrochemical lithium-storage performance.

A dual-band self-powered photodetector (SPPD) with high sensitivity is realized by a facile combination of InSe Schottky diode and Au plasmonic nanoparticle (NP) arrays. Comparing pristine devices, InSe/Au photodetectors possess an additional capability photodetection in visible to near-infrared (NIR) region. This intriguing phenomenon attributed the wavelength selective enhancement responsivities hybridized quadrupole plasmons resonance NPs. It worth pointing out that maximum ratio...

Selenium has attracted intensive attention as a promising material candidate for future optoelectronic applications. However, selenium strong tendency to grow into nanowire forms due its anisotropic atomic structure, which largely hindered the exploration of potential In this work, using physical vapor deposition method, we have demonstrated synthesis large-size, high-quality 2D nanosheets, minimum thickness could be thin 5 nm. The Se nanosheet exhibits in-plane property, is determined by...

Graphene-like two-dimensional layered materials have attracted quite a lot of interest because their sizable band gaps and potential applications. In this work, monodisperse tin disulfide (SnS2) nanosheets were successfully prepared by simple solvothermal procedure in the presence polyvinylpyrrolidone (PVP). Large PVP molecules absorbing on (001) facets SnS2 would inhibit crystal growth along [001] orientation protect product from agglomeration. The obtained diameters ca. 0.8–1 μm...

Lead-free double perovskite nanocrystals (NCs) have emerged as a new category of materials that hold the potential for overcoming instability and toxicity issues lead-based counterparts. Doping chemistry represents unique avenue toward tuning optimizing intrinsic optical electronic properties semiconductor materials. In this study, we report first example doping Yb3+ ions into lead-free Cs2AgBiX6 (X = Cl-, Br-) NCs via hot injection method. The endows with newly near-infrared emission band...

Carrier doping of MoS2 nanoflakes was achieved by functional self-assembled monolayers (SAMs) with different dipole moments. The effect SAMs on the charge transfer between substrates and studied Raman spectroscopy, field-effect transistor (FET) measurements, Kelvin probe microscope (KFM). data FET results verified that fluoroalkyltrichlorosilane-SAM a large positive moment, acting as hole donors, significantly reduced intrinsic n-doping characteristic nanoflakes, while...

2D transition metal dichalcogenide (TMD) materials have been recognized as active platforms for surface‐enhanced Raman spectroscopy (SERS). Here, the effect of crystal structure (phase) is shown, which leads to altered electronic structures TMD materials, on enhancement. Using thermally evaporated copper phthalocyanine, solution soaked rhodamine 6G, and violet typical probe molecules, it found that a phase from 2H‐ 1T‐phase can significantly increase enhancement MoX 2 (X = S, Se) monolayers...

Piezoelectric two-dimensional (2D) van der Waals (vdWs) materials are highly desirable for applications in miniaturized and flexible/wearable devices. However, the reverse-polarization between adjacent layers current 2D layered results decreasing their in-plane piezoelectric coefficients with layer number, which limits practical applications. Here, we report a class of an identical orientation polarization. Their (e22) increase thereby allowing fabrication flexible piezotronic devices large...

We report the strong catalyst-support interaction in WC-supported RuO2 nanoparticles (RuO2 -WC NPs) anchored on carbon nanosheets with low loading of Ru (4.11 wt.%), which significantly promotes oxygen evolution reaction activity a η10 347 mV and mass 1430 A gRu-1 , eight-fold higher than that commercial (176 ). Theoretical calculations demonstrate between WC support could optimize surrounding electronic structure sites to reduce barrier. Considering likewise excellent catalytic ability for...

Abstract The development of precious‐metal alternative electrocatalysts for oxygen reduction reaction (ORR) is highly desired a variety fuel cells, and single atom catalysts (SACs) have been envisaged to be the promising choice. However, there remains challenges in synthesis high metal loading SACs (>5 wt.%), thus limiting their electrocatalytic performance. Herein, facile self‐sacrificing template strategy developed fabricating Co atoms along with atomic clusters co‐anchored on...

Abstract Exploring highly active and cost‐efficient single‐atom catalysts (SACs) for oxygen reduction reaction (ORR) is critical the large‐scale application of Zn–air battery. Herein, density functional theory (DFT) calculations predict that intrinsic ORR activity metal SACs follows trend Co > Fe Ni ≈ Cu, in which possess best due to its optimized spin density. Guided by DFT calculations, four kinds transition single atoms embedded 3D porous nitrogen‐doped carbon nanosheets (MSAs@PNCN, M...

Abstract Single‐atom Fe‐N‐C (denoted as Fe 1 ‐N‐C) catalysts exhibit inadequate bifunctional activities to conquer the sluggish oxygen reduction and evolution reaction (ORR/OER), hindering their practical applications in rechargeable Zn‐air batteries (ZABs). Here, by employing ‐N‐C hollow nanorods ORR‐active support, OER‐active NiFe‐layered double hydroxide (NiFe‐LDH) nanodots are evenly decorated through a spatially confined process form NiFe‐LDH/Fe heterostructure with abundant accessible...

Neuro-inspired vision systems hold great promise to address the growing demands of mass data processing for edge computing, a distributed framework that brings computation and storage closer sources data. In addition capability static image sensing processing, hardware implementation neuro-inspired system also requires fulfilment detecting recognizing moving targets. Here, we demonstrated optical sensor based on two-dimensional NbS2/MoS2 hybrid films, which featured remarkable photo-induced...

A two-dimensional (2D) ferroelectric semiconductor, which is coupled with photosensitivity and room-temperature ferroelectricity, provides the possibility of coordinated conductance modulation by both electric field light illumination promising for triggering revolution optoelectronics monolithic multifunctional integration. Here, we report that semiconducting Sn2P2S6 crystals can be achieved in a 2D morphology using chemical vapor transport approach assistant space confinement...

Monolayer transition metal dichalcogenides (TMDs) and their van der Waals heterostructures have been experimentally theoretically demonstrated as potential candidates for photovoltaic optoelectronic devices due to the suitable bandgap excellent light absorption. In this work, we report observation of photodiode behavior in (both n- p- type) silicon/monolayer MoS2 vertical heterostructures. The photocurrent photoresponsivity photodiodes were dependent both on incident wavelength power density...

Theranostic agents for magnetic resonance imaging (MRI) guided photothermal therapy have attracted intensive interest in cancer diagnosis and treatment. However, the development of biocompatible theranostic with high conversion efficiency good MRI contrast effect remains a challenge. Herein, PEGylated Mn2+-chelated polydopamine (PMPDA) nanoparticles were successfully developed as novel simultaneous signal enhancement ablation cells, based on intrinsic manganese-chelating properties strong...

Transition metal-based compounds are promising alternative nonprecious electrocatalysts for oxygen evolution to noble metals-based materials. Nanosheet-constructed hollow structures can efficiently promote the electrocatalystic activity, mainly because of their largely exposed active sites. Herein, hierarchical Co9S8 microplates with nanosheet building units fabricated via sulfurization and subsequent calcination preformed Co-glycolate microplates. Benefiting from advantages a structure,...

We report the interlayer screening effects of ultrathin MoS2 nanoflakes with different thicknesses by measuring their surface potential using Kelvin probe microscope. Surface pristine decreased increasing thickness, while after annealing, trend was opposite and length became smaller. These results were qualitatively explained a charge transfer model built-in electric field induced trapped charges. The transport mechanism also studied conductive atomic force microscopy, thermonic emission...

Nearly monodispersed FeNi 3 submicrometre spheres with an average diameter of 220 nm were synthesized by a simple low temperature reduction method. SiO 2 @FeNi core–shell structured 25 thick shell then fabricated sol–gel process. A significant enhancement electromagnetic absorption (EMA) performance was achieved the silica coating over 2–18 GHz. The reflection loss (RL) exceeding −20 dB composite obtained 6.7–15.1 GHz choosing appropriate sample thickness between 2.1 and 3.3 mm, optimal RL...