High‐Entropy Enhanced Microwave Attenuation in Titanate Perovskites

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(11)

Published: Jan. 6, 2023

High-entropy oxides (HEOs), which incorporate multiple-principal cations into single-phase crystals and interact with diverse metal ions, extend the border for available compositions unprecedented properties. Herein, a high-entropy-stabilized (Ca0.2 Sr0.2 Ba0.2 La0.2 Pb0.2 )TiO3 perovskite is reported, effective absorption bandwidth (90% absorption) improves almost two times than that of BaTiO3 . The results demonstrate regulation entropy configuration can yield significant grain boundaries, oxygen defects, an ultradense distorted lattice. These characteristics give rise to strong interfacial defect-induced polarizations, thus synergistically contributing dielectric attenuation performance. Moreover, large strains derived from lattice distortions in high-entropy offer varied transport electron carriers. high-entropy-enhanced positive/negative charges accumulation around boundaries strain-concentrated location, quantitatively validated by holography, unusual polarization loss. This study opens up avenue designing microwave materials satisfy increasingly demanding requirements advanced integrated electronics. work also offers paradigm improving other interesting properties HEOs through engineering.

Language: Английский

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High-Entropy Na-Deficient Layered Oxides for Sodium-Ion Batteries

ACS Nano, Journal Year: 2023, Volume and Issue: 17(13), P. 12530 - 12543

Published: June 29, 2023

Sodium layered oxides always suffer from sluggish kinetics and deleterious phase transformations at deep-desodiation state (i.e., >4.0 V) in O3 structure, incurring inferior rate capability grievous capacity degradation. To tackle these handicaps, here, a configurational entropy tuning protocol through manipulating the stoichiometric ratios of inactive cations is proposed to elaborately design Na-deficient, O3-type NaxTmO2 cathodes. It found that electrons surrounding oxygen TmO6 octahedron are rearranged by introduction MnO6 TiO6 octahedra Na-deficient Na0.83Li0.1Ni0.25Co0.2Mn0.15Ti0.15Sn0.15O2-δ (MTS15) with expanded O-Na-O slab spacing, giving enhanced Na+ diffusion structural stability, as disclosed theoretical calculations electrochemical measurements. Concomitantly, effect contributes improved reversibility Co redox phase-transition behaviors between P3, clearly revealed ex situ synchrotron X-ray absorption spectra diffraction. Notably, prepared entropy-tuned MTS15 cathode exhibits impressive (76.7% retention 10 C), cycling stability (87.2% after 200 cycles) reversible 109.4 mAh g-1, good full-cell performance (84.3% 100 cycles), exceptional air stability. This work provides an idea for how high-entropy sodium high-power density storage systems.

Language: Английский

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High‐Valence Metal‐Driven Electronic Modulation for Boosting Oxygen Evolution Reaction in High‐Entropy Spinel Oxide

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(1)

Published: Sept. 22, 2023

Abstract High‐entropy spinel oxides (HESOs) are a promising class of electrocatalysts whose material properties and catalytic activity can be finely tuned by controlling the elemental composition. Although numerous HESOs already reported, their compositions primarily limited to first‐row transition metals. Herein, synthesis high‐entropy (CrFeCoNiMo) 3 O 4 nanosheet (HEO‐NS) its application as oxygen evolution reaction (OER) catalyst reported. The displays low overpotential 255.3 mV at current density 10 mA cm −2 excellent stability, outperforming IrO 2 benchmark. Careful analysis with X‐ray photoelectron spectroscopy (XPS) absorption (XAS) reveals that incorporation high‐valence Cr Mo activate lattice weakening metal–oxygen bond promoting mechanism (LOM). Furthermore, achieve high 1 A 1.71 V in lab‐scale electrolyzer, demonstrating potential for practical application.

Language: Английский

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Microwave solvothermal synthesis of Component-Tunable High-Entropy oxides as High-Efficient and stable electrocatalysts for oxygen evolution reaction

Journal of Colloid and Interface Science, Journal Year: 2023, Volume and Issue: 646, P. 89 - 97

Published: May 10, 2023

Language: Английский

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Proton-conducting solid oxide electrolysis cells: Relationship of composition-structure-property, their challenges, and prospects

Matter, Journal Year: 2023, Volume and Issue: 6(6), P. 1782 - 1830

Published: June 1, 2023

Language: Английский

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High Entropy‐Driven Role of Oxygen Vacancies for Water Oxidation

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(25)

Published: Jan. 30, 2024

Abstract Oxygen vacancy engineering is a promising strategy to enhance the electrocatalytic activities in conventional metal oxide electrocatalysts. However, utilization of oxygen vacancies high‐entropy oxides remains unknown, primarily due challenges associated with facile introduction and explanation their roles complex systems. Herein, into realized unique high entropy‐driven role for evolution reaction (OER) process revealed. A low‐temperature surface carbonization–decarbonization approach developed introduce regulate spinel (HEOs). The HEOs can both facilitate pre‐oxidation faster OH − adsorption induce bridge site pathway easier deprotonation, distinctive where favor * yet hinder deprotonation. Consequently, as‐prepared (HEOs‐Ov) exhibit superior OER activities, outperforming most reported oxide‐based Besides, this universal method be extended other different configuration entropies scaled up. work paves way exploration toward electrocatalysis fields.

Language: Английский

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Intergrating Hollow Multishelled Structure and High Entropy Engineering toward Enhanced Mechano‐Electrochemical Properties in Lithium Battery

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(19)

Published: Feb. 2, 2024

Hollow multishelled structures (HoMSs) are attracting great interest in lithium-ion batteries as the conversion anodes, owing to their superior buffering effect and mechanical stability. Given synthetic challenges, especially elemental diffusion barrier multimetal combinations, this complex structure design has been realized low- medium-entropy compounds so far. It means that poor reaction reversibility low intrinsic conductivity remain largely unresolved. Here, a hollow (LiFeZnNiCoMn)

Language: Английский

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High‐Entropy Oxides for Rechargeable Batteries

Advanced Science, Journal Year: 2024, Volume and Issue: 11(25)

Published: April 22, 2024

Abstract High‐entropy oxides (HEOs) have garnered significant attention within the realm of rechargeable batteries owing to their distinctive advantages, which encompass diverse structural attributes, customizable compositions, entropy‐driven stabilization effects, and remarkable superionic conductivity. Despite brilliance HEOs in energy conversion storage applications, there is still lacking a comprehensive review for both entry‐level experienced researchers, succinctly encapsulates present status challenges inherent HEOs, spanning features, intrinsic properties, prevalent synthetic methodologies, diversified applications batteries. Within this review, endeavor distill characteristics, ionic conductivity, entropy explore practical (lithium‐ion, sodium‐ion, lithium‐sulfur batteries), including anode cathode materials, electrolytes, electrocatalysts. The seeks furnish an overview evolving landscape HEOs‐based cell component shedding light on progress made hurdles encountered, as well serving guidance compositions design optimization strategy enhance reversible stability, electrical electrochemical performance conversion.

Language: Английский

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High-entropy doping strategy towards reinforced Mn-O bond for durable aqueous zinc ion batteries

Nano Energy, Journal Year: 2024, Volume and Issue: 122, P. 109348 - 109348

Published: Feb. 1, 2024

Language: Английский

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Medium- and high-entropy materials as positive electrodes for sodium-ion batteries: Quo Vadis?

Energy storage materials, Journal Year: 2024, Volume and Issue: 67, P. 103213 - 103213

Published: Feb. 6, 2024

Language: Английский

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