Manipulating Spin Exchange Interactions and Spin-Selected Electron Transfers of 2D Metal Phosphorus Trisulfide Crystals for Efficient Oxygen Evolution Reaction

Because oxygen molecules in the ground state favor a triplet spin configuration, spin-polarized electrons at electrocatalysts may promote the generation of parallel spin-aligned oxygen atoms, enhancing oxygen evolution reaction (OER) kinetics. In this study, a significant enhancement of OER performance is demonstrated by controlling the spin-exchange interaction and spin-selected electron transfer of 2D Co_xFe_1−xPS₃ (x = 0–0.45) van der Waals (vdW) single crystals through Co doping. The pristine FePS₃ exhibits antiferromagnetic orbital ordering, while the Co-doped FePS₃ exhibits the emergence of interatomic ferromagnetism due to doping-mediated magnetic exchange interactions. The coupling between Fe and Co ions in the Co-doped FePS₃ crystal allows the formation of efficient spin-selective electron transfer channels compared to the pristine FePS₃. The correlation of spin-exchange interactions and spin-selected electron transfers of 2D Co-doped FePS₃ crystals with a superior OER performance is further revealed by superconducting quantum interference device magnetometer, in situ X-ray absorption near edge spectra and density functional theory simulations. The result suggests that manipulating the spin-exchange interactions of 2D vdW crystals to enhance the spin-selected electron transfer efficiencies through doping is an effective strategy to boost their OER catalytic performances.     

Design and Analysis of Gate Overlapped/Underlapped NWFET Based Lable Free Biosensor

Silicon - In this paper, gate all around (GAA) nanowire P-channel FET label free biosensor is proposed with cavity. Proposed structure is label free so it doesn’t require selective material...     

Fatigue performance of the aluminium-magnesium/magnesium aluminate in-situ composites synthesized through manganese dioxide and copper oxide reinforcement

Aluminium-2magnesium alloy castings find its application in engineering sectors where fatigue property is a key requirement. Few researches have been carried out in the past to improve its fatigue property by micro, nano reinforcements. However, the requirement of intended application has not yet attained and hence this current research study has been taken up to provide a solution. This research work focuses through a novel approach for synthesizing in-situ magnesium aluminate particles in aluminium-2magnesium alloy by the addition of manganese dioxide and copper oxide precursor addition (1 wt.%, 1.5 wt.% and 2 wt.%) during the casting process. Microstructure of fabricated composites were examined through field emission scanning electron microscopy to characterize the morphology and distribution of magnesium aluminate particles. The fabricated aluminium-2magnesium/magnesium aluminate in-situ composite specimens were subjected to low cycle fatigue testing at two different strain amplitudes of 0.3 % and 0.4 % and a frequency of 0.3 Hz. Among all composite specimens, specimens reinforced with 2 wt.% manganese dioxide and 2 wt.% copper oxide outperformed when tested in strain amplitudes of 0.3 % and 0.4 % respectively. Fractography studies were performed on failed composite specimens to study the modes of failure that resulted after fatigue testing.     

High Cathode Loading and Low-Temperature Operating Garnet-Based All-Solid-State Lithium Batteries – Material/Process/Architecture Optimization and Understanding of Cell Failure

All-solid-state lithium batteries (ASSLBs) are prepared using garnet-type solid electrolytes by quick liquid phase sintering (Q-LPS) without applying high pressure during the sintering. The cathode layers are quickly sintered with a heating rate of 50–100 K min⁻¹ and a dwell time of 10 min. The battery performance is dramatically improved by simultaneously optimizing materials, processes, and architectures, and the initial discharge capacity of the cell with a LiCoO₂-loading of 8.1 mg reaches 1 mAh cm⁻² and 130 mAh g⁻¹ at 25 °C. The all-solid-state cell exhibits capacity at a reduced temperature (10 °C) or a relatively high rate (0.1 C) compared to the previous reports. The Q-LPS would be suitable for large-scale manufacturing of ASSLBs. The multiphysics analyses indicate that the internal stress reaches 1 GPa during charge/discharge, which would induce several mechanical failures of the cells: broken electron networks, broken ion networks, separation of interfaces, and delamination of layers. The experimental results also support these failures.