A high-entropy atomic environment converts inactive to active sites for electrocatalysis

Energy & Environmental Science, Год журнала: 2023, Номер 16(2), С. 619 - 628

Опубликована: Янв. 1, 2023

An electronegativity-dominant high-entropy atomic environment regulation strategy was developed to manipulate the electrocatalytic properties by tailoring competitive adsorption sites in HEA NPs.

Язык: Английский

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High-Entropy Alloy with Mo-Coordination as Efficient Electrocatalyst for Oxygen Evolution Reaction

ACS Catalysis, Год журнала: 2022, Номер 12(17), С. 10808 - 10817

Опубликована: Авг. 19, 2022

Electrochemical hydrolytic hydrogen production is the most promising method for renewable energy storage and conversion. However, kinetic slow oxygen evolution reaction (OER) limits development of water electrolysis at anode. The state-of-the-art OER catalysts face a dilemma high content noble metals low activities. Herein, strategy achieving efficient stable high-entropy alloy (HEA) by Mo-coordination reported. earth-abundant FeCoNiMo HEA catalyst provides an overpotential as 250 mV current density 10 mA cm–2 in alkaline medium, which 89 lower than that IrO2. turnover frequency 0.051 s–1 300 3 times higher commercial IrO2 even 11 FeCoNi without Mo-coordination. Importantly, exhibits stability 100 cm–2. Methanol molecular probe experiment X-ray photoelectron spectroscopy analyses suggest electrons Mo transfer to Fe, Co, Ni catalyst, leads weakened OH* bonding and, result, enhanced performance catalyst. Consistent with methanol analysis, real-time simulation reveals coordination within can speed up rate-determining deprotonation step OER. Our finding opens routine designing cost-effective electrocatalysts OER, could facilitate discoveries catalysts.

Язык: Английский

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Electrocatalytic water splitting: Mechanism and electrocatalyst design

Nano Research, Год журнала: 2023, Номер 16(7), С. 9142 - 9157

Опубликована: Апрель 2, 2023

Язык: Английский

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High‐Entropy Materials for Water Electrolysis

Energy Technology, Год журнала: 2022, Номер 10(11)

Опубликована: Сен. 8, 2022

Green hydrogen production by renewables‐powered water electrolysis holds the key to energy sustainability and a carbon‐neutral future. The sluggish kinetics of water‐splitting reactions, namely, evolution reaction (HER) oxygen (OER), however, remains bottleneck technology. High‐entropy materials, due their compositional flexibility, structural stability, synergy between various elemental components, have recently aroused considerable interest in catalyzing reactions. Herein, timely review recent achievements is provided high‐entropy materials for electrolysis. An overview different kinds HER OER half‐reactions introduced, followed discussion theoretical experimental efforts understanding fundamental origins enhanced catalytic performance observed on catalysts. Various design strategies, including control size shape, construction porous structure, engineering defect, formation hybrid/composite develop catalysts with improved are highlighted. Finally, remaining challenges pointed out corresponding perspectives address these put forward promote development research field

Язык: Английский

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Carbothermal Shock Synthesis of High Entropy Oxide Catalysts: Dynamic Structural and Chemical Reconstruction Boosting the Catalytic Activity and Stability toward Oxygen Evolution Reaction

Advanced Energy Materials, Год журнала: 2022, Номер 12(35)

Опубликована: Июль 27, 2022

Abstract Mixed transition‐metals (TM) based catalysts have shown huge promise for water splitting. Conventional synthesis of nanomaterials is strongly constrained by room‐temperature equilibria and Ostwald ripening. Ultra‐fast temperature cycling enables the metastable metallic phases high entropy alloy nanoparticles, which later transform to oxide/hydroxide nanoparticles upon use in aqueous electrolytes. Herein, an situ non‐noble metal oxide (HEO) on carbon fibers rapid Joule heating quenching reported. Different compositions ternary senary (FeNiCoCrMnV) HEO show higher activity towards catalyzing oxygen evolution reaction (OER) compared a noble IrO 2 catalyst. The synthesized also two orders magnitude stability than , due stronger carbide‐mediated intimacy with substrate, activated through OER process. Alloying elements Cr, Mn V affect promoting different oxidation states catalytically active TM (Fe, Ni Co). Dissolution less stable (Mn, Cr) leads enhancements activity. Dynamic structural chemical perturbations activate under conditions, leading enlargement ECSA forming mixed single atom ultra‐fine oxyhydroxide HEOs.

Язык: Английский

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Non-noble metal-based amorphous high-entropy oxides as efficient and reliable electrocatalysts for oxygen evolution reaction

Nano Research, Год журнала: 2022, Номер 15(10), С. 8751 - 8759

Опубликована: Март 4, 2022

Язык: Английский

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High‐Entropy Catalyst—A Novel Platform for Electrochemical Water Splitting

Advanced Functional Materials, Год журнала: 2022, Номер 32(47)

Опубликована: Сен. 16, 2022

Abstract High‐entropy materials (HEMs) have been in the spotlight as emerging catalysts for electrochemical water splitting. In particular, HEM feature multi‐element active sites and unsaturated coordination well entropy stabilization comparison with their single‐element counterparts. Herein, a comprehensive overview of used splitting is provided, covering both hydrogen evolution reaction (HER) oxygen (OER). Particularly, review begins discussions concept structure HEMs. addition, effective strategies rationally designing HEMs on basis computational techniques experimental aspects described. Importantly, importance computationally aided methods, that is, density functional theory calculations, high‐throughput screening, machine learning, to discovery design HEMs, Furthermore, applications field electrolysis are reviewed. Eventually, an outlook regarding prospects future opportunities provided.

Язык: Английский

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High entropy alloys as electrode material for supercapacitors: A review

Journal of Energy Storage, Год журнала: 2021, Номер 44, С. 103405 - 103405

Опубликована: Окт. 19, 2021

Язык: Английский

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Design Principles of Single‐Atom Catalysts for Oxygen Evolution Reaction: From Targeted Structures to Active Sites

Advanced Materials, Год журнала: 2023, Номер 36(7)

Опубликована: Сен. 14, 2023

Hydrogen production from electrolytic water electrolysis is considered a viable method for hydrogen with significant social value due to its clean and pollution-free nature, high efficiency, purity, but the anode oxygen evolution reaction (OER) process complex kinetically slow. Single-atom catalysts (SACs) 100% atom utilization homogeneous active sites often exhibit catalytic activity are expected be extensively applied. The performance of OER can further improved by precise regulation structure through electronic effects, coordination environment, heteroatomic doping, so on. In this review, mechanisms under different conditions introduced, latest research progress SACs in field systematically summarized, then effects various structural strategies on discussed, principles ideas design proposed. end, outstanding issues current challenges summarized.

Язык: Английский

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In Situ Reconstruction of High‐Entropy Heterostructure Catalysts for Stable Oxygen Evolution Electrocatalysis under Industrial Conditions

Advanced Materials, Год журнала: 2024, Номер 36(14)

Опубликована: Янв. 3, 2024

Abstract Despite of urgent needs for highly stable and efficient electrochemical water‐splitting devices, it remains extremely challenging to acquire oxygen evolution reaction (OER) electrocatalysts under harsh industrial conditions. Here, a successful in situ synthesis FeCoNiMnCr high‐entropy alloy (HEA) oxide (HEO) heterocatalysts via Cr‐induced spontaneous reconstruction strategy is reported, demonstrated that they deliver excellent ultrastable OER electrocatalytic performance with low overpotential 320 mV at 500 mA cm −2 negligible activity loss after maintaining 100 240 h. Remarkably, the heterocatalyst holds outstanding long‐term stability condition 6 m KOH 85 °C current density as high over Density functional theory calculations reveal formation HEA‐HEO heterostructure can provide electroactive sites possessing robust valence states guarantee process, leading enhancement electroactivity. The findings such conditions offer new perspective designing constructing practical water splitting.

Язык: Английский

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