A 3d‐4d‐5d High Entropy Alloy as a Bifunctional Oxygen Catalyst for Robust Aqueous Zinc–Air Batteries

Advanced Materials, Год журнала: 2023, Номер 35(46)

Опубликована: Июль 24, 2023

High entropy alloys (HEAs) are highly suitable candidate catalysts for oxygen evolution and reduction reactions (OER/ORR) as they offer numerous parameters optimizing the electronic structure catalytic sites. Herein, FeCoNiMoW HEA nanoparticles synthesized using a solution-based low-temperature approach. Such show high properties, subtle lattice distortions, modulated structure, leading to superior OER performance with an overpotential of 233 mV at 10 mA cm-2 276 100 . Density functional theory calculations reveal structures active sites optimized d-band center position that enables adsorption OOH* intermediates reduces Gibbs free energy barrier in process. Aqueous zinc-air batteries (ZABs) based on this demonstrate open circuit potential 1.59 V, peak power density 116.9 mW , specific capacity 857 mAh gZn-1, excellent stability over 660 h continuous charge-discharge cycles. Flexible solid ZABs also assembled tested, displaying different bending angles. This work shows significance 4d/5d metal-modulated ability improve OER/ORR, ZABs, beyond.

Язык: Английский

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Optimization strategies of high-entropy alloys for electrocatalytic applications

Chemical Science, Год журнала: 2023, Номер 14(45), С. 12850 - 12868

Опубликована: Янв. 1, 2023

This review summarizes the synthesis methods, characterization research progress and regulation strategies of HAEs in field electrocatalytic HER, HOR, OER, ORR, CO 2 RR, NRR AOR, providing deep understanding for future applications.

Язык: Английский

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Phosphorus‐Modified Amorphous High‐Entropy CoFeNiCrMn Compound as High‐Performance Electrocatalyst for Hydrazine‐Assisted Water Electrolysis

Small, Год журнала: 2023, Номер 19(42)

Опубликована: Июнь 22, 2023

Exploiting highly active and bifunctional catalysts for both hydrogen evolution reaction (HER) hydrazine oxidation (HzOR) is a prerequisite the acquisition. High-entropy materials have received widespread attention in catalysis, but high-performance electrodes are still lacking. Herein, novel P-modified amorphous high-entropy CoFeNiCrMn compound developed on nickel foam (NF) by one-step electrodeposition strategy. The achieved CoFeNiCrMnP/NF delivers remarkable HER HzOR performance, where overpotentials as low 51 268 mV realized at 100 mA cm-2 . improved cell voltage of 91 further demonstrated assessing constructed hydrazine-assisted water electrolyser, which almost 1.54 V lower than HER||OER system. Experimental results confirm important role each element regulating bifuncational performance catalysts. main influencing elements seem to be Fe Ni HER, while P-modification Cr metal may contribute lot HzOR. These synergistic advantages help energy barriers improve kinetics, resulting excellent activity CoFeNiCrMnP/NF. work offers feasible strategy develop self-supporting electrode with overall splitting.

Язык: Английский

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Self-supported NiO/CuO electrodes to boost urea oxidation in direct urea fuel cells

Nano Energy, Год журнала: 2023, Номер 115, С. 108714 - 108714

Опубликована: Июль 14, 2023

Язык: Английский

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Identifying the Role of the Cationic Geometric Configuration in Spinel Catalysts for Polysulfide Conversion in Sodium–Sulfur Batteries

Journal of the American Chemical Society, Год журнала: 2023, Номер 145(34), С. 18992 - 19004

Опубликована: Авг. 21, 2023

An AB2X4 spinel structure, with tetrahedral A and octahedral B sites, is a paradigmatic class of catalysts several possible geometric configurations numerous applications, including polysulfide conversion in metal–sulfur batteries. Nonetheless, the influence configuration composition on mechanisms catalysis precise manner which facilitate polysulfides remain unknown. To enable controlled exposure single active configurations, herein, Cotd2+ Cooh3+ Co3O4 for sodium are large part replaced by Fetd2+ Feoh3+, respectively, generating FeCo2O4 CoFe2O4. Through an examination electrochemical activation energies, characterization symmetric cells, theoretical calculations, we determine that serves as site breaking S–S bonds, while functions formation S–Na bonds. The current study underlines subtle relationship between activity catalysts, providing unique insights rational development improved optimizing their atomic configuration.

Язык: Английский

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Unlocking the Potential of High Entropy Alloys in Electrochemical Water Splitting: A Review

Small, Год журнала: 2024, Номер 20(29)

Опубликована: Фев. 23, 2024

The global pursuit of sustainable energy is focused on producing hydrogen through electrocatalysis driven by renewable energy. Recently, High entropy alloys (HEAs) have taken the spotlight in electrolysis due to their intriguing cocktail effect, broad design space, customizable electronic structure, and stabilization effect. tunability complexity HEAs allow a diverse range active sites, optimizing adsorption strength activity for electrochemical water splitting. This review comprehensively covers contemporary advancements synthesis technique, framework, physio-chemical evaluation approaches HEA-based electrocatalysts. Additionally, it explores principles strategies aimed at catalytic activity, stability, effectiveness evolution reaction (HER), oxygen (OER), overall Through an in-depth investigation these aspects, inherent constituent element interactions, processes, sites associated with unravel. Eventually, outlook regarding challenges impending difficulties outline future direction HEA provided. thorough knowledge offered this will assist formulating designing catalysts based next generation electrochemistry-related applications.

Язык: Английский

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A review of noble metal-free high entropy alloys for water splitting applications

Journal of Materials Chemistry A, Год журнала: 2024, Номер 12(17), С. 9933 - 9961

Опубликована: Янв. 1, 2024

Nano-sized high entropy alloy (HEA) catalysts have attracted much attention as extraordinary electrocatalysts in water-splitting applications, i.e. , the hydrogen evolution reaction (HER) and oxygen (OER).

Язык: Английский

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Enhanced Oxygen Evolution and Zinc‐Air Battery Performance via Electronic Spin Modulation in Heterostructured Catalysts

Advanced Materials, Год журнала: 2024, Номер 36(31)

Опубликована: Май 25, 2024

Beyond optimizing electronic energy levels, the modulation of spin configuration is an effective strategy, often overlooked, to boost activity and selectivity in a range catalytic reactions, including oxygen evolution reaction (OER). This frequently accomplished using external magnetic fields, which makes it impractical for real applications. Herein, achieved by engineering Ni/MnFe

Язык: Английский

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Structure–Activity Relationships in Oxygen Electrocatalysis

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 30, 2024

Abstract Oxygen electrocatalysis, as the pivotal circle of many green energy technologies, sets off a worldwide research boom in full swing, while its large kinetic obstacles require remarkable catalysts to break through. Here, based on summarizing reaction mechanisms and situ characterizations, structure–activity relationships oxygen electrocatalysts are emphatically overviewed, including influence geometric morphology chemical structures electrocatalytic performances. Subsequently, experimental/theoretical is combined with device applications comprehensively summarize cutting‐edge according various material categories. Finally, future challenges forecasted from perspective catalyst development applications, favoring researchers promote industrialization electrocatalysis at an early date.

Язык: Английский

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Active site switching on high entropy phosphides as bifunctional oxygen electrocatalysts for rechargeable/robust Zn–air battery

Energy & Environmental Science, Год журнала: 2024, Номер 17(19), С. 7193 - 7208

Опубликована: Янв. 1, 2024

FeCoNiPdWP exhibit excellent oxygen evolution and reduction reaction performance via all elements playing distinctive roles the switchable active sites in redox reactions, leading to robust zinc air batteries.

Язык: Английский

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