In-situ growing carbon nanotubes reinforced highly heat dissipative three-dimensional aluminum framework composites.

The demand for lightweight heat dissipation design in highly miniaturized and portable electronic devices with high thermal density is becoming increasingly urgent. Herein, highly thermal conductive carbon nanotubes (CNTs) reinforced aluminum foam composites were prepared by catalyst chemical bath and subsequent in-situ growth approach. The dense CNTs show the intertwined structure features and construct high-speed channels near the surface of the skeletons for efficient thermal conduction, promoting the transport efficiency of heat flow.

IrO/MnO metal oxide-support interaction enables robust acidic water oxidation.

The sluggish kinetics, poor stability, and high iridium loading in acidic oxygen evolution reaction (OER) present significant challenges for proton exchange membrane water electrolyzers (PEMWE). While supported catalysts can enhance the utilization and activity of Ir atoms, they often fail to mitigate the detrimental effects of over-oxidation and dissolution of Ir. Here, we leverage the redox properties of the Mn/Mn couple as electronic modulators to develop a low-iridium, durable electrocatalyst for acidic OER.

Rational Construction of Pt Incorporated CoO as High-Performance Electrocatalyst for Hydrogen Evolution Reaction.

Electrocatalysts in alkaline electrocatalytic water splitting are required to efficiently produce hydrogen while posing a challenge to show excellent performances. Herein, we have successfully synthesized platinum nanoparticles incorporated in a CoO nanostructure (denoted as Pt-CoO) that show superior HER activity and stability in alkaline solutions (the overpotentials of 37 mV to reach 10 mA cm). The outstanding electrocatalytic activity originates from synergistic effects between Pt and CoO and increased electron conduction.

Tensile Strain-Mediated Spinel Ferrites Enable Superior Oxygen Evolution Activity.

Exploring efficient strategies to overcome the performance constraints of oxygen evolution reaction (OER) electrocatalysts is vital for electrocatalytic applications such as HO splitting, CO reduction, N reduction, . Herein, tunable, wide-range strain engineering of spinel oxides, such as NiFeO, is proposed to enhance the OER activity. The lattice strain is regulated by interfacial thermal mismatch during the bonding process between thermally expanding NiFeO nanoparticles and the nonexpanding carbon fiber substrate.

Carbon nanotubes encapsulating Pt/MoN heterostructures for superior hydrogen evolution.

Achieving efficient hydrogen evolution reaction (HER) catalysts to scale up electrochemical water splitting is desirable but remains a major challenge. Here, nitrogen-doped carbon nanotubes (NCNTs) loaded with PtNi/MoN electrocatalyst (PtNi/MoN@C) is synthesized by a simple strategy to obtain stronger interphase effects and significantly improve HER activity. The surface morphology of the materials is altered by Pt doping and the electronic structure of MoN is changed, which optimizing the electronic environment of the materials, shifting the binding energy and giving the materials a higher electrical conductivity, this ultimately leads to faster proton and electron transfer processes.

Radial phased-locked Laguerre-Gaussian correlated schell-model beam array.

A new beam array called radial phased-locked Laguerre-Gaussian correlated Schell-model (LGCSM) beam array is presented, the beamlet of this beam array is partially coherent beam with Laguerre Gaussian-Schell model correlation. The propagation expression of a radial phased-locked LGCSM beam array in free space is derived. It is aimed to give the effect of beam parameters on evolutions of beam array composed by LGCSM beam.

Surface activation towards manganese dioxide nanosheet arrays via plasma engineering as cathode and anode for efficient water splitting.

Developing high-efficiency, low-cost electrocatalysts for water splitting is important but challenging. Two-dimensional nanosheet manganese dioxide (MnO) arrays are promising candidates for the design and development of advanced catalysts because of their large surface area. Here, a feasible solution to improve the catalytic activity of MnO materials via decorating the active sites on the surface is proposed.

Plasma-induced surface reorganization of porous CoO-CoO heterostructured nanosheets for electrocatalytic water oxidation.

Herein, porous CoO-CoO heterostructured nanosheets are constructed by plasma treatment. The density-functional theory calculations demonstrate that constructing CoO-CoO heterostructures modify the electronic structure to achieve enhanced electrical conductivity, but also boost the charge transfer to realize enhanced surface reactivity. Contributing to the short ion diffusion path, the rich electroactive surface sites and enhanced charge transfer capability, the resulting CoO-CoO nanosheet arrays possess the low overpotential of 270 mV at 10 mA cm and the low Tafel slope of 49 mV dec.

Rich P vacancies modulate NiP/CuP interfaced nanosheets for electrocatalytic alkaline water splitting.

Constructing well-defined interfaces is vital to improve the electrocatalytic properties, but the studies on transition-metal-interface electrocatalysts with rich vacancies are rarely reported. Here, rich P vacancies to modulate NiP/CuP interfaced nanosheets for overall water splitting is demonstrated. We conduct a series of experimental parameters to adjust the nanostructures of NiP/CuP, and to get insight into the synergistic effects of interfaces and P vacancies on the catalytic activities.

Bifunctional Electrocatalysts Based on Mo-Doped NiCoP Nanosheet Arrays for Overall Water Splitting.

Rational design of efficient bifunctional electrocatalysts is highly imperative but still a challenge for overall water splitting. Herein, we construct novel freestanding Mo-doped NiCoP nanosheet arrays by the hydrothermal and phosphation processes, serving as bifunctional electrocatalysts for overall water splitting. Notably, Mo doping could effectively modulate the electronic structure of NiCoP, leading to the increased electroactive site and improved intrinsic activity of each site.

Free-standing porous NiP-NiP heterostructured arrays for efficient electrocatalytic water splitting.

Constructing heterointerfaces in heterostructures could effectively enlarge the electroactive sites and enhance the interfacial charge transfer, and thus improve the electrocatalytic performances. Herein, free-standing porous NiP-NiP heterostructured arrays are successfully prepared through in situ phosphating Ni(OH) arrays by simply tuning the reaction temperatures. Contributing from the interfacial coupling effects of two phases, large surface areas, highly conductive support of carbon cloth substrates and unique free-standing arrays, NiP-NiP heterostructured arrays show the enhanced kinetics and electrocatalytic performances for the hydrogen evolution reaction, oxygen evolution reaction and overall water splitting.

Designing and constructing core-shell NiCoS@NiS on Ni foam by facile one-step strategy as advanced battery-type electrodes for supercapattery.

Herein, we successfully design and construct core-shell nanostructured NiCoS@NiS directly on Ni foam by a scalable and effective one-step strategy. Further, through simply and accurately controlling the concentration of sulfur source, various nanostructures of NiCoS@NiS arrays in situ on Ni foam are successfully synthesized. The intriguing core-shell structures and integrated electrode configurations endow NiCoS@NiS electrode a large electroactive sites, fast electron transport path and sufficient contacts with electrolyte.