High Entropy Oxides: Mapping the Landscape from Fundamentals to Future Vistas

ACS Energy Letters, Год журнала: 2024, Номер 9(8), С. 3694 - 3718

Опубликована: Июль 5, 2024

High-entropy materials (HEMs) are typically crystalline, phase-pure and configurationally disordered that contain at least five elements evenly blended into a solid-solution framework. The discovery of high-entropy alloys (HEAs) oxides (HEOs) disrupted traditional notions in science, providing avenues for the exploration new materials, property optimization, pursuit advanced applications. While there has been significant research on HEAs, creative breakthroughs HEOs still being revealed. This focus review aims developing structured framework expressing concept HEM, with special emphasis crystal structure functional properties HEOs. Insights recent synthetic advances, foster prospective outcomes their current applications electrocatalysis, battery, comprehensively discussed. Further, it sheds light existing constraints HEOs, highlights adoption theoretical experimental tools to tackle challenges, while delineates potential directions energy application.

Язык: Английский

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Sustainable photocatalytic hydrogen peroxide production over octonary high-entropy oxide

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Ноя. 3, 2024

The direct utilization of solar energy for the artificial photosynthesis hydrogen peroxide (H2O2) provides a reliable approach producing this high-value green oxidant. Here we report on utility high-entropy oxide (HEO) semiconductor as an all-in-one photocatalyst visible light-driven H2O2 production directly from H2O and atmospheric O2 without need any additional cocatalysts or sacrificial agents. This contains eight earth-abundant metal elements (Ti/V/Cr/Nb/Mo/W/Al/Cu) homogeneously arranged within single rutile phase, intrinsic chemical complexity along with presence high density oxygen vacancies endow distinct broadband light harvesting capability. An efficient rate apparent quantum yield 38.8% at 550 nm can be achieved. readily assembled into floating leaves sustained on-site open water resources under natural sunlight irradiation. "all-in-one" enables photocatalytic external agents

Язык: Английский

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High-Entropy Lithium Niobate Nanocubes for Photocatalytic Water Splitting under Visible Light

The Journal of Physical Chemistry Letters, Год журнала: 2024, Номер 15(19), С. 5103 - 5111

Опубликована: Май 6, 2024

The vast compositional space available in high-entropy oxide semiconductors offers unique opportunities for electronic band structure engineering an unprecedented large room. In this work, with wide gap semiconductor lithium niobate (LiNbO3) as a model system, we show that the substitutional addition of metal cation mixtures within Nb sublattice can lead to formation single-phase solid solution featuring substantially narrowed and intense broadband visible light absorption. resulting LiNbO3 [denoted Li(HE)O3] crystallizes well-faceted nanocubes; atomic-resolution imaging elemental mapping via transmission electron microscopy unveil distinct local chemical complexity lattice distortion, characteristics stabilized phases. Because presence Co2+ dopants serve active catalytic sites, Li(HE)O3 nanocubes accomplish light-driven photocatalytic water splitting aqueous containing methanol sacrificial donor without need any additional co-catalysts.

Язык: Английский

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Controllable Regulation of the Oxygen Redox Process in Lithium–Oxygen Batteries by High-Configuration-Entropy Spinel with an Asymmetric Octahedral Structure

ACS Nano, Год журнала: 2024, Номер 18(18), С. 11849 - 11862

Опубликована: Апрель 25, 2024

Designing bifunctional electrocatalysts to boost oxygen redox reactions is critical for high-performance lithium–oxygen batteries (LOBs). In this work, high-entropy spinel (Co0.2Mn0.2Ni0.2Fe0.2Cr0.2)3O4 (HEOS) fabricated by modulating the internal configuration entropy of and studied as electrode catalyst in LOBs. Under atomic environment, Co–O octahedron undergoes asymmetric deformation, reconfiguration electron structure around Co sites leads upward shift d-orbital centers toward Fermi level, which conducive strong adsorption intermediate LiO2 on surface HEOS, ultimately forming a layer highly dispersed Li2O2 thin film. Thin-film beneficial ion diffusion transfer at electrode–electrolyte interface, makes product easy decompose during charge process, accelerating kinetics Based above advantages, HEOS-based LOBs deliver high discharge/charge capacity (12.61/11.72 mAh cm–2) excellent cyclability (424 cycles). This work broadens way design cathode catalysts improve

Язык: Английский

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Halite-structured (MgCoNiMnFe)O high entropy oxide (HEO) for chemical looping dry reforming of methane

Applied Catalysis B Environment and Energy, Год журнала: 2024, Номер 355, С. 124191 - 124191

Опубликована: Май 11, 2024

Язык: Английский

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