The oxygen reduction reaction (ORR) and evolution (OER) are cornerstone reactions for many renewable energy technologies. Developing cheap yet durable substitutes of precious-metal catalysts, especially the bifunctional electrocatalysts with high activity both ORR OER their streamlined coupling process, highly desirable to reduce processing cost complexity systems. Here, a facile strategy is reported synthesizing double-shelled hybrid nanocages outer shells Co-N-doped graphitic carbon...

Optimizing properties of phosphors for use in white-light-emitting diodes (WLEDs) is an important materials challenge. Most have a low level lattice disorder due to mismatch between the host and activator cations. Here we show that deliberate introduction high levels cation leads significant improvements quantum efficiency, stability thermal quenching, emission lifetime Sr1.98–x(Ca0.55Ba0.45)xSi5N8:Eu0.02 (x = 0–1.5) phosphors. Replacing Sr by (Ca0.55Ba0.45) mixture with same average radius...

Abstract Electrochemical CO 2 reduction (ECR) is highly attractive to curb global warming. The knowledge on the evolution of catalysts and identification active sites during reaction important, but still limited. Here, we report an efficient catalyst (Ag-D) with suitable defect concentration operando formed ECR within several minutes. Utilizing powerful fast X-ray absorption spectroscopy, evolving electronic crystal structures are unraveled under condition. exhibits a ~100% faradaic...

A 3D hierarchical Mn₃O₄nanoflake structure supported on nitrogenated reduced graphene oxide (NrGO), with excellent oxygen reduction in alkaline medium, was developed by electrodeposition. High performance is attributed to poor nanoflake crystallinity and strong nanoflake–NrGO coupling.

Understanding the solid electrolyte interphase (SEI) formation process in novel battery systems is of primary importance. Alongside increasingly powerful situ techniques, searching for readily accessible, noninvasive, and low-cost tools to probe chemistry highly demanded. Here, we applied distribution relaxation time analysis interpret electrochemical impedance spectroscopy results during cycling, which able distinguish various processes based on their constants. By building a direct link...

Abstract Rechargeable sodium‐carbon dioxide batteries utilize CO 2 directly and use abundant low‐cost sodium instead of lithium. Sodium carbonate is an important discharge product in Na‐CO its oxidative decomposition during charging determines cell performance (i.e., overpotentials cyclability) but the mechanism has not been addressed yet. Herein, it found that Na 3 process follows a different pathway to lithium decomposition. It proceeds via reactive •− intermediate singlet oxygen...

Abstract: The development of 5G application technology has led to a rapid expansion in the scale internet data center rooms and number servers. Due high heat generation server equipment mixing hot cold airflows within rooms, thermal environment these fails meet operational requirements with increasing energy consumption density. This study utilized 6SigmaDC software simulate analyze characteristics existing problems airflow distribution small-scale center. Based on identified issues current...

Electrocatalytic CO2 reduction (ECR) into value-added chemicals offers potential solution for renewable energy as well global carbon footprint concerns. In this review we introduce the general methods and metrics that are commonly applied in ECR, followed by a discussion of current reaction mechanisms different pathways. We highlight how size structure electrocatalysts affect ECR performance recent advances metal-free single-atom catalysts. The challenges also discussed optimistic...

Green reduction at room temperature: Gold nanoclusters supported on mesostructured ceria matrix (Au/meso-CeO2, see figure) are exceptionally effective for aqueous formate-mediated transfer of a wide range aldehydes to alcohols with high functional group tolerance temperature. Detailed facts importance specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by the authors. Please note: The publisher...

Highly size-controllable synthesis of free-standing perfectly crystalline silicon carbide nanocrystals has been achieved for the first time through a plasma-based bottom-up process. This low-cost, scalable, ligand-free atmospheric pressure technique allows fabrication ultra-small (down to 1.5 nm) with very low level surface contamination, leading fundamental insights into optical properties nanocrystals. is also confirmed by their exceptional photoluminescence emission yield enhanced more...

The sodium oxygen battery is a promising metal-air battery; however, the discharge process not well understood and major product still under debate. products determined theoretical specific energy electrochemical performance of battery. Now it demonstrated that NaO2 spontaneously disproportionates to Na2 O2 , no matter whether dissolved in solution or stays on surface. behaviors surface are different. Solvents play crucial effect disproportionation species, which fast low donor number (DN)...

Given the high cost and poisoning issues of Pt, developing Pd-based catalysts as substitutes is highly essential. Although substantial progress has been made, synthesis electrocatalysts with both activity stability in oxygen reduction reaction (ORR) remains a challenge. In this work, we prepared Pd-Ag nanowires up to micro-sized length diameter ∼17 nm via facile modified polyol method. The obtained (NWs) exhibit interlaced features are rich grain boundary defects. Due continuous boundaries...

Efficient catalysts are highly desirable for the selective electrochemical CO2 reduction reaction (CO2RR). Ni single-atom known as promising CO2RR catalysts, while NPs expected to catalyze competing HER. In this work, we have modified by encapsulating them into porous Ni-N-C nanosheets (Ni@Ni-N-C), boost synergy between and dispersed Ni-N species towards CO2RR. The CO faradaic efficiency (FECO) reached 96.4% at -0.9 V retained over 90% in a wide potential window. More importantly, FECO...

Chemoselective reduction of α,β-unsaturated aldehydes in the presence CO and H2O proceeds effectively over a ceria-supported gold catalyst system, providing novel, efficient clean approach to produce useful primary allyl alcohols with excellent activity selectivity.

Magnetite nanoparticles act as peroxidase-like mimetics to catalyse lipid peroxidation in liposomes at acidic pH, predominantly by decomposing the pre-existing LOOH initiate chain reactions.

An effective one-step method has been developed to synthesize CuPd bimetallic nanowire networks. Investigation of the growth process revealed that nanowires were formed by attachment spherical particles and strongly influenced interactions between surface ligands metals. The morphology nanoparticles is tuned via changing molecular weight polyvinylpyrrolidone (PVP) solvents. versatility this was further demonstrated preparation AgPd nanowires. electrochemical study networks shows dependent...

Combined temperature dependent structural and electrical characterization of a series "empty" ferroelectric tetragonal tungsten bronzes (TTBs) composition Ba4(La1–xNdx)0.67□1.33Nb10O30 are reported. The La-material exhibits crossover from relaxor-ferroelectric to polar (but nonferroelectric) linear dielectric behavior. loss switching in the polar, nonferroelectric phase is accompanied by disorder associated with relaxation due significant vacancy concentration at A1-perovskite-like site. In...

g-C₃N₄/RGO/TiO₂with nitrogen and oxygen vacancies possesses an efficient H₂evolution rate, which exceeds that of g-C₃N₄/RGO/TiO₂without vacancy defects.

The study of gold (Au) nanoclusters (NCs) as effective co-catalysts has attracted considerable research interests in photoelectrocatalysis. However, it is still a challenge to design an Au NC-hybridized photoelectrode, which exhibits both high performance, particularly photoelectrocatalytic full water splitting, and long-term photostability. Herein, we present simple efficient synthesis strategy for boosting the photoelectrochemical performance photostability TiO2 nanowire arrays (NWAs) by...

Rechargeable Li–CO2 batteries as a novel system developed in recent years directly use CO2 the reactant, which enables deeper penetration of energy storage and utilization. The battery system, however, is at an early stage, many challenges remained to be overcome urgently, especially problem high over-potential during charging process. Here, we report redox mediator, phenoxathiin, assist decomposition Li2CO3 process, effectively reduces improves cycling performance battery. Furthermore,...