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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Advanced electrocatalysts with unusual active sites for electrochemical water splitting

InfoMat, Год журнала: 2023, Номер 6(1)

Опубликована: Ноя. 27, 2023

Abstract Electrochemical water splitting represents a promising technology for green hydrogen production. To design advanced electrocatalysts, it is crucial to identify their active sites and interpret the relationship between structures performance. Materials extensively studied as electrocatalysts include noble‐metal‐based (e.g., Ru, Ir, Pt) non‐noble‐metal‐based 3d transition metals) compounds. Recently, advancements in characterization techniques theoretical calculations have revealed novel unusual sites. The present review highlights latest achievements discovery identification of various unconventional electrochemical splitting, with focus on state‐of‐the‐art strategies determining true establishing structure–activity relationships. Furthermore, we discuss remaining challenges future perspectives development next‐generation By presenting fresh perspective reaction involved this aims provide valuable guidance study industrial applications. image

Язык: Английский

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Improved OER catalytic performance of NiFe-LDH with hydrothermal carbonization microspheres

Journal of Alloys and Compounds, Год журнала: 2023, Номер 941, С. 168994 - 168994

Опубликована: Янв. 21, 2023

Язык: Английский

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Electrocatalysts for the oxygen evolution reaction: mechanism, innovative strategies, and beyond

Materials Chemistry Frontiers, Год журнала: 2023, Номер 7(20), С. 4833 - 4864

Опубликована: Янв. 1, 2023

This review provides a comprehensive of recent advances in the design OER catalysts. Specifically, it focuses on kinetics and stability catalysts, catalytic mechanism innovative strategies.

Язык: Английский

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Defect Engineering for Enhanced Electrocatalytic Oxygen Reaction on Transition Metal Oxides: The Role of Metal Defects

Advanced Materials, Год журнала: 2024, Номер 36(28)

Опубликована: Апрель 26, 2024

Metal defect engineering is a highly effective strategy for addressing the prevalent high overpotential issues associated with transition metal oxides functioning as dual-function commercial oxygen reduction reaction/oxygen evolution reaction catalysts increasing their activity and stability. However, formation energy of defects poses challenge to development strategies precisely control selectivity during formation. Here, density functional theory calculations are used demonstrate that altering pathway releases atoms chlorides, which effectively reduces defects. The on monometallic oxide surface (Mn, Fe, Co, Ni) selectively produced using chlorine plasma. characterization reveal catalytic enhanced owing electronic delocalization induced by defects, theoretical overpotential. Notably, ab initio molecular dynamics calculations, ex situ XPS, in ATR-SEIRAS suggest improve adsorption reactive species active sites enhance efficiency product desorption, thereby boosting performance.

Язык: Английский

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Electronic Modulation in Cu Doped NiCo LDH/NiCo Heterostructure for Highly Efficient Overall Water Splitting

Small, Год журнала: 2024, Номер 20(28)

Опубликована: Фев. 8, 2024

Abstract Layered double hydroxides (LDHs), promising bifunctional electrocatalysts for overall water splitting, are hindered by their poor conductivity and sluggish electrochemical reaction kinetics. Herein, a hierarchical Cu‐doped NiCo LDH/NiCo alloy heterostructure with rich oxygen vacancies electronic modulation is tactfully designed. It extraordinarily effectively drives both the evolution (151 mV@10 mA cm −2 ) hydrogen (73 in an alkaline medium. As electrodes low cell voltage of 1.51 V at 10 remarkable long‐term stability 100 h achieved. The experimental theoretical results reveal that Cu doping recombination can improve kinetics LDH surface charge redistribution reduced Gibbs free energy barriers. This work provides new inspiration further design construction nonprecious metal‐based based on structure strategies.

Язык: Английский

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Energy-efficient hydrogen generation using multiferroic TbCrO3 nanoparticles via electrocatalysis coupled with hydrazine oxidation and photocatalysis

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 58, С. 717 - 725

Опубликована: Янв. 28, 2024

Язык: Английский

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Transition metal-based layered double hydroxides and their derivatives for efficient oxygen evolution reaction

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 63, С. 918 - 936

Опубликована: Март 23, 2024

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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Out-of-plane coordination of iridium single atoms with organic molecules and cobalt–iron hydroxides to boost oxygen evolution reaction

Nature Nanotechnology, Год журнала: 2024, Номер unknown

Опубликована: Окт. 21, 2024

Abstract Advancements in single-atom-based catalysts are crucial for enhancing oxygen evolution reaction (OER) performance while reducing precious metal usage. A comprehensive understanding of underlying mechanisms will expedite this progress further. Here we report Ir single atoms coordinated out-of-plane with dimethylimidazole (MI) on CoFe hydroxide (Ir 1 /(Co,Fe)-OH/MI). This /(Co,Fe)-OH/MI catalyst, which was prepared using a simple immersion method, delivers ultralow overpotentials 179 mV at current density 10 mA cm −2 and 257 600 as well an ultra-small Tafel slope 24 dec −1 . Furthermore, has total mass activity exceeding that commercial IrO 2 by factor 58.4. Ab initio simulations indicate the coordination MI leads to electron redistribution around sites. causes positive shift d -band centre adjacent Co sites, facilitating optimal energy pathway OER.

Язык: Английский

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