Two-Dimensional High-Entropy Metal Phosphorus Trichalcogenides for Enhanced Hydrogen Evolution Reaction

ACS Nano, Journal Year: 2022, Volume and Issue: 16(3), P. 3593 - 3603

Published: Feb. 25, 2022

Developing earth-abundant and highly effective electrocatalysts for hydrogen evolution reaction (HER) is a prerequisite the upcoming energy society. Two-dimensional (2D) high-entropy metal phosphorus trichalcogenides (MPCh3) have advantages of both near-continuous adsorption energies alloys (HEAs) large specific surface area 2D materials, which are excellent catalytic platforms. As typical catalyst, Co0.6(VMnNiZn)0.4PS3 nanosheets with high-concentration active sites successfully demonstrated to show enhanced HER performance: an overpotential 65.9 mV at current density 10 mA cm-2 Tafel slope 65.5 dec-1. Decent spectroscopy characterizations combined function theory analyses scenario enhancement mechanism by strategy. The optimized S on edge P basal plane provide more adsorption, introduced Mn boost water dissociation during Volmer step. MPCh3 provides avenue combination HEAs materials enhance performance, also alternative platform explore design superior catalysts various electrochemical systems.

Language: Английский

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Short‐Range Diffusion Enables General Synthesis of Medium‐Entropy Alloy Aerogels

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(30)

Published: May 25, 2022

Medium-entropy alloy aerogels (MEAAs) with the advantages of both multimetallic alloys and are promising new materials in catalytic applications. However, limited by immiscible behavior different metals, achieving single-phase MEAAs is still a grand challenge. Herein, general strategy for preparing ultralight 3D porous lowest density 39.3 mg cm-3 among metal reported, through combining auto-combustion subsequent low-temperature reduction procedures. The homogenous mixing precursors at ionic level makes short-range diffusion atoms possible to drive formation MEAAs. As proof concept catalysis, as-synthesized Ni50 Co15 Fe30 Cu5 exhibit high mass activity 1.62 A mg-1 specific 132.24 mA cm-2 toward methanol oxidation reactions, much higher than those low-entropy counterparts. In situ Fourier transform infrared NMR spectroscopies reveal that can enable highly selective conversion formate. Most importantly, methanol-oxidation-assisted MEAAs-based water electrolyzer achieve low cell voltage 1.476 V 10 making value-added formate anode H2 cathode, 173 mV lower traditional alkaline electrolyzers.

Language: Английский

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High-entropy oxides for catalysis: A diamond in the rough

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 451, P. 138659 - 138659

Published: Aug. 17, 2022

Language: Английский

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Band Gap Narrowing in a High-Entropy Spinel Oxide Semiconductor for Enhanced Oxygen Evolution Catalysis

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(12), P. 6753 - 6761

Published: March 15, 2023

High-entropy oxides (HEOs), which contain five or more metal cations that are generally thought to be randomly mixed in a crystalline oxide lattice, can exhibit unique and enhanced properties, including improved catalytic performance, due synergistic effects. Here, we show band gap narrowing emerges high-entropy aluminate spinel oxide, (Fe0.2Co0.2Ni0.2Cu0.2Zn0.2)Al2O4 (A5Al2O4). The 0.9 eV of A5Al2O4 is narrower than the gaps all parent oxides. First-principles calculations for multicomponent AAl2O4 spinels indicate arises from broadening energy distribution 3d states variations electronegativities crystal field splitting across transition-metal series. As catalyst oxygen evolution reaction an alkaline electrolyte, reaches current density 10 mA/cm2 at overpotential 400 mV, outperforming single-metal end members applied potential 1.7 V vs RHE. Catalyst deactivation occurs after 5 h attributed, based on elemental analysis grazing-incidence X-ray diffraction, formation passivating layer blocks surface. This result helps validate HEO active catalyst. observation expands scope properties exhibited by materials offers insight into question how electronic structure engineered via approach achieve properties.

Language: Английский

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Noble-metal-based high-entropy-alloy nanoparticles for electrocatalysis

Journal of Energy Chemistry, Journal Year: 2021, Volume and Issue: 68, P. 721 - 751

Published: Dec. 23, 2021

Language: Английский

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High‐entropy alloy catalysts: From bulk to nano toward highly efficient carbon and nitrogen catalysis

Carbon Energy, Journal Year: 2022, Volume and Issue: 4(5), P. 731 - 761

Published: July 12, 2022

Abstract High‐entropy alloys (HEAs) have attracted widespread attention as both structural and functional materials owing to their huge multielement composition space unique high‐entropy mixing structure. Recently, emerging HEAs, either in nano or highly porous bulk forms, are developed utilized for various catalytic clean energy applications with superior activity remarkable durability. Being catalysts, HEAs possess some advantages, including (1) a the discovery of new catalysts fine‐tuning surface adsorption (i.e., selectivity), (2) diverse active sites derived from random that especially suitable multistep catalysis, (3) stabilized structure improves durability harsh environments. Benefited these inherent HEA demonstrated performances promising complex carbon (C) nitrogen (N) cycle reactions featuring reaction pathways many different intermediates. However, design, synthesis, characterization, understanding C‐ N‐involved extremely challenging because reactions. In this review, we present recent development particularly on innovative extensive syntheses, advanced (in situ) characterizations, C N looping reactions, aiming provide focused view how utilize intrinsically important end, remaining challenges future directions proposed guide application efficient storage chemical conversion toward neutrality.

Language: Английский

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Multifunctional High Entropy Alloys Enabled by Severe Lattice Distortion

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(17)

Published: Aug. 10, 2023

Since 2004, the design of high entropy alloys (HEAs) has generated significant interest within materials science community due to their exceptional structural and functional properties. By incorporating multiple principal elements into a common lattice, it is possible create single-phase crystal with highly distorted lattice. This unique feature enables HEAs offer promising combination mechanical physical properties that are not typically observed in conventional alloys. In this article, an extensive overview multifunctional exhibit severe lattice distortion provided, covering theoretical models developed understand distortion, experimental computational methods employ characterize most importantly, impact on mechanical, electrochemical HEAs. Through review, hoped stimulate further research study lattices crystalline solids.

Language: Английский

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

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(47)

Published: Sept. 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.

Language: Английский

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High entropy alloys as electrode material for supercapacitors: A review

Journal of Energy Storage, Journal Year: 2021, Volume and Issue: 44, P. 103405 - 103405

Published: Oct. 19, 2021

Language: Английский

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Enhancing hydrogen storage properties of MgH2 using FeCoNiCrMn high entropy alloy catalysts

Journal of Material Science and Technology, Journal Year: 2023, Volume and Issue: 149, P. 88 - 98

Published: Jan. 26, 2023

Language: Английский

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