High-entropy materials for catalysis: A new frontier

Science Advances, Год журнала: 2021, Номер 7(20)

Опубликована: Май 12, 2021

Entropy plays a pivotal role in catalysis, and extensive research efforts have been directed to understanding the enthalpy-entropy relationship that defines reaction pathways of molecular species. On other side, surface catalysts, entropic effects rarely investigated because difficulty deciphering increased complexities multicomponent systems. Recent advances high-entropy materials (HEMs) triggered broad interests exploring entropy-stabilized systems for where enhanced configurational entropy affords virtually unlimited scope tailoring structures properties HEMs. In this review, we summarize recent progress discovery design HEMs catalysis. The correlation between compositional structural engineering optimization catalytic behaviors is highlighted alloys, oxides, beyond. Tuning composition configuration introduces untapped opportunities accessing better catalysts resolving issues are considered challenging conventional, simple

Язык: Английский

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Recent progress of high-entropy materials for energy storage and conversion

Journal of Materials Chemistry A, Год журнала: 2020, Номер 9(2), С. 782 - 823

Опубликована: Ноя. 25, 2020

This review covers the recent developments in catalysis, water splitting, fuel cells, batteries, supercapacitors, and hydrogen storage enabled by high entropy materials.

Язык: Английский

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Advanced High Entropy Perovskite Oxide Electrocatalyst for Oxygen Evolution Reaction

Advanced Functional Materials, Год журнала: 2021, Номер 31(27)

Опубликована: Май 5, 2021

Abstract A new type of lanthanum‐based high entropy perovskite oxide (HEPO) electrocatalyst for the oxygen evolution reaction is reported. The B‐site lattices in HEPO consist five consecutive first‐row transition metals, including Cr, Mn, Fe, Co, and Ni. Equimolar non‐equimolar electrocatalysts are studied their OER electrocatalytic performance. In HEPOs, concentration one metals doubled individual samples. performances all HEPOs outperform single oxides. optimized La(CrMnFeCo 2 Ni)O 3 exhibits an outstanding overpotential 325 mV at a current density 10 mA cm −2 excellent electrochemical stability after 50 h testing.

Язык: Английский

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Subnanometer high-entropy alloy nanowires enable remarkable hydrogen oxidation catalysis

Nature Communications, Год журнала: 2021, Номер 12(1)

Опубликована: Окт. 29, 2021

High-entropy alloys (HEAs) with unique physicochemical properties have attracted tremendous attention in many fields, yet the precise control on dimension and morphology at atomic level remains formidable challenges. Herein, we synthesize PtRuNiCoFeMo HEA subnanometer nanowires (SNWs) for alkaline hydrogen oxidation reaction (HOR). The mass specific activities of SNWs/C reach 6.75 A mgPt+Ru-1 8.96 mA cm-2, respectively, which are 2.8/2.6, 4.1/2.4, 19.8/18.7 times higher than those NPs/C, commercial PtRu/C Pt/C, respectively. It can even display enhanced resistance to CO poisoning during HOR presence 1000 ppm CO. Density functional theory calculations reveal that strong interactions between different metal sites SNWs greatly regulate binding strength proton hydroxyl, therefore enhances activity. This work not only provides a viable synthetic route fabrication Pt-based subnano/nano materials, but also promotes fundamental researches catalysis beyond.

Язык: Английский

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Status and perspectives of key materials for PEM electrolyzer

Deleted Journal, Год журнала: 2022, Номер 1, С. e9120032 - e9120032

Опубликована: Сен. 8, 2022

Proton exchange membrane water electrolyzer (PEMWE) represents a promising technology for the sustainable production of hydrogen, which is capable efficiently coupling to intermittent electricity from renewable energy sources (e.g., solar and wind). The with compact stack structure has many notable advantages, including large current density, high hydrogen purity, great conversion efficiency. However, use expensive electrocatalysts construction materials leads costs limited application. In this review, recent advances made in key PEMWE are summarized. First, we present brief overview about basic principles, thermodynamics, reaction kinetics PEMWE. We then describe cell components their respective functions, as well discuss research status such membrane, electrocatalysts, electrode assemblies, gas diffusion layer, bipolar plate. also attempt clarify degradation mechanisms under real operating environment, catalyst degradation, plate layer degradation. finally propose several future directions developing through devoting more efforts materials.

Язык: Английский

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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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Multi‐Sites Electrocatalysis in High‐Entropy Alloys

Advanced Functional Materials, Год журнала: 2021, Номер 31(47)

Опубликована: Авг. 26, 2021

Abstract High‐entropy alloys (HEAs) have attracted widespread attention in electrocatalysis due to their unique advantages (adjustable composition, complex surface, high tolerance, etc.). They allow for the formation of new and tailorable active sites multiple elements adjacent each other, interaction can be tailored by rational selection element configuration composition. However, it needs further explored catalyst design, elements, determination sites. This review article focuses on important progress multi‐sites HEAs. The classification is done basis catalytic reaction, including hydrogen evolution oxygen reduction alcohol oxidation carbon dioxide nitrogen reaction. Based experiments theories, a more in‐depth exploration activity HEAs will conducted, (the special role catalysis) effect. provide design some reactions, adjust compositions improve intrinsic activity. Furthermore, remaining challenges future directions promising research fields are also provided.

Язык: Английский

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Bimetallic Sites for Catalysis: From Binuclear Metal Sites to Bimetallic Nanoclusters and Nanoparticles

Chemical Reviews, Год журнала: 2023, Номер 123(8), С. 4855 - 4933

Опубликована: Март 27, 2023

Heterogeneous bimetallic catalysts have broad applications in industrial processes, but achieving a fundamental understanding on the nature of active sites at atomic and molecular level is very challenging due to structural complexity catalysts. Comparing features catalytic performances different entities will favor formation unified structure-reactivity relationships heterogeneous thereby facilitate upgrading current In this review, we discuss geometric electronic structures three representative types (bimetallic binuclear sites, nanoclusters, nanoparticles) then summarize synthesis methodologies characterization techniques for entities, with emphasis recent progress made past decade. The supported nanoparticles series important reactions are discussed. Finally, future research directions catalysis based and, more generally, prospective developments both practical applications.

Язык: Английский

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What Makes High‐Entropy Alloys Exceptional Electrocatalysts?

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(52), С. 26894 - 26903

Опубликована: Авг. 26, 2021

Abstract The formation of a vast number different multielement active sites in compositionally complex solid solution materials, often more generally termed high‐entropy alloys, offers new and unique concepts catalyst design, which mitigate existing limitations change the view on structure–activity relations. We discuss these by summarising currently fundamental knowledge critically assess chances this material class, also highlighting design strategies. A roadmap is proposed, illustrating characteristic could be exploited using strategy, breakthroughs might possible to guide future research highly promising class for (electro)catalysis.

Язык: Английский

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Self‐Reconstruction of Sulfate‐Containing High Entropy Sulfide for Exceptionally High‐Performance Oxygen Evolution Reaction Electrocatalyst

Advanced Functional Materials, Год журнала: 2021, Номер 31(48)

Опубликована: Авг. 31, 2021

Abstract Novel earth‐abundant metal sulfate‐containing high entropy sulfides, FeNiCoCrXS 2 (where X = Mn, Cu, Zn, or Al), are synthesized via a two‐step solvothermal method. It is shown that FeNiCoCrMnS exhibits superior oxygen evolution reaction (OER) activity with an exceptionally low overpotential of 199, 246, 285, and 308 mV at current densities 10, 100, 500, 1000 mA cm –2 , respectively, surpassing its unary‐, binary‐, ternary‐, quaternary‐metal counterparts. The electrocatalyst yields exceptional stability after 12 000 cycles 55 h durability even density 500 . Various in situ ex analyses used to investigate the self‐reconstruction sulfides during OER for first time. resulting (oxy)hydroxide believed be true active center OER. remaining sulfate also contributes catalytic activity. Density function theory calculation good agreement experimental result. extraordinary performance sulfide brings great opportunity desirable catalyst design practical applications.

Язык: Английский

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