The intricate sulfur redox chemistry involves multiple electron transfers and complicated phase *** have been previously explored to overcome the kinetic barrier in lithium-sulfur batteries（LSBs）.This work contribut...
详细信息
The intricate sulfur redox chemistry involves multiple electron transfers and complicated phase *** have been previously explored to overcome the kinetic barrier in lithium-sulfur batteries（LSBs）.This work contributes to closing the knowledge gap and examines electrocatalysis for enhancing LSB *** a strong chemical affinity for polysulfides,the electrocatalyst enables efficient adsorption and accelerated electron transfer *** cells with catalyzed cathodes exhibit improved rate capability and excellent stability over 500 cycles with 91.9% capacity retention at C/*** addition,cells were shown to perform at high rates up to 2C and at high sulfur loadings up to 6 mg *** electrochemical,spectroscopic,and microscopic analyses provide insights into the mechanism for retaining high activity,coulombic efficiency,and *** work delves into crucial processes identifying pivotal reaction steps during the cycling process at commercially relevant areal capacities and rates.
Furious dendritic growth and destructive parasitic reactions（hydrogen evolution reaction,corrosion,and passivation） severely degraded the development of aqueous Zn-ion batteries（AZIBs） in the field of grid and sta...
详细信息
Furious dendritic growth and destructive parasitic reactions（hydrogen evolution reaction,corrosion,and passivation） severely degraded the development of aqueous Zn-ion batteries（AZIBs） in the field of grid and stationary energy ***,trace amount of tetracycline hydrochloride（TC-HCl） additive（only 0.5 mM） is employed as a mediator to steer a stable Zn anode-electrolyte *** by theoretical calculations and experiment analysis,TC molecule with zincophilic groups can remodel the solvation sheath and disrupt H-bonds network due to its high electronegative O atoms,which effectively expedites the desolvation process and reduces the electrochemical activity of solvent ***,the TC molecules are preferentially adsorbed on the Zn electrode than active water molecules,which are beneficial for steering uniform nucleation and restricting the erosion of *** from these synergistic effects,the Zn//Zn symmetric cell containing TC-HCl additive exhibits an ultra-long cycle life of exceeding 2200 h at 1.0 mA cm-2and 1.0 mAh ***,the practical Zn//α-MnO2full cell using the modified electrolyte also demonstrates the enhanced *** study provides valuable insights into the widespread use of trace electrolyte additives and facilitates the industrialization of AZIBs with long lifespans.
All-perovskite tandem solar cells(TSCs) consist of a wide-bandgap(WBG,1.75-1.8 eV) top subcell and a low-bandgap(LBG,1.2-1.3 eV) bottom subcell,exhibit superior power conversion efficiencies(PCEs)compared to single-ju...
详细信息
All-perovskite tandem solar cells(TSCs) consist of a wide-bandgap(WBG,1.75-1.8 eV) top subcell and a low-bandgap(LBG,1.2-1.3 eV) bottom subcell,exhibit superior power conversion efficiencies(PCEs)compared to single-junction perovskite solar cells(PSCs).In addition,the advantages of lowtemperature solution preparation and low manufactu ring cost make the all-perovskite tandem solar cells widely concerned,and are considered to be one of the most potential next-generation high-performance thin film photovoltaic *** this perspective,we briefly summarize the state-of-the-art advances in monolithic all-perovskite TSCs focusing on the following aspects:LBG perovskite bottom subcells,WBG perovskite top subcells,and interconnecting layers(ICLs).We then discuss the primary strategies to improve their performa nce and finally highlight the perspective regarding the achievement of efficient and stable all-perovskite tandems.
Xenotime rare-earth(RE)phosphates are emerging as promising materials for environmental barrier coatings(EBCs)for SiC-based ceramic-matrix composites(CMCs)because of their close coefficients of thermal expansion(CTEs)...
详细信息
Xenotime rare-earth(RE)phosphates are emerging as promising materials for environmental barrier coatings(EBCs)for SiC-based ceramic-matrix composites(CMCs)because of their close coefficients of thermal expansion(CTEs)and resistance to calcium-magnesium-alumina-silicate(CMAS)*** this work,high-entropy(HE)(Sc_(0.2)Lu_(0.2)Yb_(0.2)Er_(0.2)Y_(0.2))PO_(4) and five single-component REPO4(RE=Sc,Lu,Yb,Er,and Y)compounds were synthesized,and their stability,thermal properties,and CMAS corrosion resistance were *** CTE values of four REPO_(4) compounds(RE=Lu,Yb,Er,and Y;~(5.6-6)×10^(−6)℃^(−1))are close to those of SiC-CMC((4.5-5.5)×10^(−6)℃^(−1)),whereas ScPO_(4)(6.98×10^(−6)℃^(−1))and HE(5RE_(0.2))PO_(4)(6.39×10^(−6)℃^(−1))have slightly higher values in the temperature range of 200-1300℃.HE phosphate has the lowest thermal conductivity due to its size and mass *** CMAS corrosion tests at 1300℃ for 5,45,and 96 h revealed that all RE phosphates formed a continuous and dense reaction layer predominantly composed of Ca_(8)MgRE(PO_(4))_(7),effectively impeding CMAS ***,REPO_(4) with smaller RE³−cations displays a slower reaction rate and reduced corrosion kinetics,as evidenced by the smaller thickness of the reaction layer.A larger negative difference in the optical basicity(OB)value between REPO_(4) and CMAS signifies greater corrosion resistance.A mechanistic understanding of CMAS corrosion and elucidation of the effects of critical parameters such as the ionic mass and ionic radius of RE elements on their thermal properties and CMAS corrosion kinetics are useful for the development of novel xenotime-type phosphates as EBCs for SiC-CMCs.
Emerging machine learning(ML)approaches have been adopted in various material systems to predict novel properties with the assistance of the corresponding large *** new materials,however,collecting sufficient data poi...
详细信息
Emerging machine learning(ML)approaches have been adopted in various material systems to predict novel properties with the assistance of the corresponding large *** new materials,however,collecting sufficient data points for model training is not feasible,which is the case for gold nanoparticle/polymer hybrid *** this study,an ML approach coupled with finite element modeling was proposed for predicting the optical and photothermal properties of gold nanoparticle/polymer hybrid *** datasets of the optical and photothermal properties were built using results from the ***,finite element analyses were conducted to generate synthetic data to satisfy the quality and quantity of the data required for training *** analysis and model training were performed using the datasets with and without synthetic data to evaluate their effects on predicting the performance of the ML *** relative importance of features to targets(properties)was evaluated by correlation *** models with high accuracy were obtained by training various models from conventional to newly developed ***,weaknesses,and improvement of the synthetic data addition were *** proposed workflow and framework offer reliable prediction of optical and photothermal properties over different combinations of gold nanoparticles and polymer matrices,which can be extended to include more features related to processing parameters and microstructures.
Dissolution kinetics of CaO·2Al_(2)O_(3)(CA_(2))particles in a synthetic CaO-Al_(2)O_(3)-SiO_(2)steelmaking slag system have been investigated using the high-temperature confocal laser scanning *** of temperature...
详细信息
Dissolution kinetics of CaO·2Al_(2)O_(3)(CA_(2))particles in a synthetic CaO-Al_(2)O_(3)-SiO_(2)steelmaking slag system have been investigated using the high-temperature confocal laser scanning *** of temperature(i.e.,1500,1550,and 1600℃)and slag composition on the dissolution time of CA_(2)particles are investigated,along with the time dependency of the projection area of the particle during the dissolution *** is found that the dissolution rate was enhanced by either an increase in temperature or a decrease in slag ***,a higher ratio of CaO/Al_(2)O_(3)(C/A)leads to an increased dissolution rate of CA_(2)particle at 1600℃.Thermodynamic calculations suggested the dissolution product,i.e.,melilite,formed on the surface of the CA_(2)particle during dissolution in slag with a C/A ratio of 3.8 at 1550℃.Scanning electron microscopy equipped with energy dispersive X-ray spectrometry analysis of as-quenched samples confirmed the dissolution path of CA_(2)particles in slags with C/A ratios of 1.8 and 3.8 as well as the melilite formed on the surface of CA_(2)*** formation of this layer during the dissolution process was identified as a hindrance,impeding the dissolution of CA_(2)particle.A valuable reference for designing or/and choosing the composition of top slag for clean steel production is provided,especially using calcium treatment during the secondary refining process.
Aqueous zinc-ion batteries（AZIBs） are gaining attention owing to their affordability,high safety,and high energy density,making them a promising solution for large-scale energy ***,their performance is hampered by t...
详细信息
Aqueous zinc-ion batteries（AZIBs） are gaining attention owing to their affordability,high safety,and high energy density,making them a promising solution for large-scale energy ***,their performance is hampered by the instability of both the anode-electrolyte interface and the cathode-electrolyte *** use of sodium gluconate（SG）,an organic sodium salt with multiple hydroxyl groups,as an electrolyte additive is *** and theoretical analyses demonstrate that Na+from SG can intercalate and deintercalate within the associated V2O5cathode during in situ electrochemical *** action supports the layered structure of V2O5,prevents structural collapse and phase transitions,and enhances Zn2+diffusion ***,the gluconate anion disrupts the original Zn2+solvation structure,mitigates water-induced side reactions,and suppresses Zn dendrite *** synchronous regulation of both the V2O5cathode and Zn anode by the SG additive leads to considerable performance ***‖Zn symmetric batteries demonstrate a cycle life exceeding 2800 h at 0.5 mA cm-2and 1 mAh *** Zn‖V2O5full batteries,a high specific capacity of 288.92 mAh g-1and capacity retention of 82.29% are maintained over 1000 cycles at a current density of 2 A *** multifunctional additive strategy offers a new pathway for the practical application of AZIBs.
Triboelectricity,when rubbing or contacting materials causes electric charge transfer,is ubiquitous across many fields,and has been studied in detail for *** this,a complete description of triboelectricity remains ***...
详细信息
Triboelectricity,when rubbing or contacting materials causes electric charge transfer,is ubiquitous across many fields,and has been studied in detail for *** this,a complete description of triboelectricity remains ***,we analyze the contact between a metal asperity and a semiconductor,including contributions from the depletion zone of the semiconductor and from flexoelectric polarization that arises due to the strain gradients at asperity *** free charges involved in charge transfer are then discussed and *** a result,we develop a quantitative model for triboelectric charge transfer that details how charge transfer scales with contact parameters,the relative influence of depletion and flexoelectricity,and which agrees with various trends in multiple classes of triboelectric experiments.
The Subsea Shuttle Tanker (SST) was presented by the authors as an innovative and cost-effective solution in several research works. This new approach offers a viable alternative to subsea pipelines and shuttle tanker...
详细信息
暂无评论