Facet Engineering of Advanced Electrocatalysts Toward Hydrogen/Oxygen Evolution Reactions

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Фев. 16, 2023

The electrocatalytic water splitting technology can generate high-purity hydrogen without emitting carbon dioxide, which is in favor of relieving environmental pollution and energy crisis achieving neutrality. Electrocatalysts effectively reduce the reaction barrier increase efficiency. Facet engineering considered as a promising strategy controlling ratio desired crystal planes on surface. Owing to anisotropy, with different orientations usually feature facet-dependent physical chemical properties, leading differences adsorption energies oxygen or intermediates, thus exhibit varied activity toward evolution (HER) (OER). In this review, brief introduction basic concepts, fundamental understanding mechanisms well key evaluating parameters for both HER OER are provided. formation facets comprehensively overviewed aiming give scientific theory guides realize dominant planes. Subsequently, three strategies selective capping agent, etching coordination modulation tune summarized. Then, we present an overview significant contributions facet-engineered catalysts HER, OER, overall splitting. particular, highlight that density functional calculations play indispensable role unveiling structure–activity correlation between plane catalytic activity. Finally, remaining challenges provided future prospects designing advanced electrocatalysts discussed.

Язык: Английский

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Self‐integration exactly constructing oxygen‐modified MoNi alloys for efficient hydrogen evolution

EcoEnergy, Год журнала: 2023, Номер 1(2), С. 425 - 436

Опубликована: Дек. 1, 2023

Abstract Introducing oxygen atoms into nickel‐based alloys is an effective strategy for constructing water dissociation sites hydrogen evolution reaction (HER). However, controlling content to realize the best match of and adsorption challenging. Herein, we exploit self‐integration process MoNi alloy in molten salts introduce atoms, which ultimately leads localized generation robust NiO x H y around alloys. Interestingly, Mo further doped (Mo‐NiO ) construct active center due high mobility ionic solutions. Owing covering space confinement salt, exactly decorated with Mo‐NiO nanosheets. Both physical characterization density functional theory calculation prove that electron transport, capability, are finely tuned benefited from O doping, thus greatly expediting HER kinetics. exhibits a much lower overpotential 33 mV at 10 cm −2 alkaline electrolyte, even superior Pt/C benchmark. Moreover, final requires low 57 acidic media. This enhancement ascribed successful assembly foam elicited by salt.

Язык: Английский

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Ir Nanoparticles Anchored on Metal‐Organic Frameworks for Efficient Overall Water Splitting under pH‐Universal Conditions

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(17)

Опубликована: Март 2, 2023

The construction of high-activity and low-cost electrocatalysts is critical for efficient hydrogen production by water electrolysis. Herein, we developed an advanced electrocatalyst anchoring well-dispersed Ir nanoparticles on nickel metal-organic framework (MOF) Ni-NDC (NDC: 2,6-naphthalenedicarboxylic) nanosheets. Benefiting from the strong synergy between MOF through interfacial Ni-O-Ir bonds, synthesized Ir@Ni-NDC showed exceptional electrocatalytic performance evolution reaction (HER), oxygen (OER) overall splitting in a wide pH range, superior to commercial benchmarks most reported electrocatalysts. Theoretical calculations revealed that charge redistribution bridge induced optimization H2 O, OH* H* adsorption, thus leading accelerated electrochemical kinetics HER OER. This work provides new clue exploit bifunctional pH-universal splitting.

Язык: Английский

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Tailoring a local acid-like microenvironment for efficient neutral hydrogen evolution

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Июль 14, 2023

Electrochemical hydrogen evolution reaction in neutral media is listed as the most difficult challenges of energy catalysis due to sluggish kinetics. Herein, Ir-HxWO3 catalyst readily synthesized and exhibits enhanced performance for reaction. HxWO3 support functioned proton sponge create a local acid-like microenvironment around Ir metal sites by spontaneous injection protons WO3, evidenced spectroscopy electrochemical analysis. Rationalize revitalized lattice-hydrogen species located interface are coupled with Had atoms on metallic surfaces via thermodynamically favorable Volmer-Tafel steps, thereby fast Elaborated demonstrates activity low overpotential 20 mV at 10 mA cm-2 Tafel slope 28 dec-1, which even comparable those acidic environment. The concept exemplified this work offer possibilities tailoring regulate catalytic pathway.

Язык: Английский

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Lamella-heterostructured nanoporous bimetallic iron-cobalt alloy/oxyhydroxide and cerium oxynitride electrodes as stable catalysts for oxygen evolution

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Март 31, 2023

Developing robust nonprecious-metal electrocatalysts with high activity towards sluggish oxygen-evolution reaction is paramount for large-scale hydrogen production via electrochemical water splitting. Here we report that self-supported laminate composite electrodes composed of alternating nanoporous bimetallic iron-cobalt alloy/oxyhydroxide and cerium oxynitride (FeCo/CeO2-xNx) heterolamellas hold great promise as highly efficient alkaline reaction. By virtue three-dimensional architecture to offer abundant accessible electroactive CoFeOOH/CeO2-xNx heterostructure interfaces through facilitating electron transfer mass transport, FeCo/CeO2-xNx exhibit superior electrocatalysis in 1 M KOH, ultralow Tafel slope ~33 mV dec-1. At overpotential low 360 mV, they reach >3900 mA cm-2 retain exceptional stability at ~1900 >1000 h, outperforming commercial RuO2 some representative oxygen-evolution-reaction catalysts recently reported. These properties make them attractive candidates electrolysis generation.

Язык: Английский

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Duplex Interpenetrating-Phase FeNiZn and FeNi3 Heterostructure with Low-Gibbs Free Energy Interface Coupling for Highly Efficient Overall Water Splitting

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Апрель 10, 2023

Abstract The sluggish kinetics of both hydrogen evolution reaction (HER) and oxygen (OER) generate the large overpotential in water electrolysis thus high-cost production. Here, multidimensional nanoporous interpenetrating-phase FeNiZn alloy FeNi 3 intermetallic heterostructure is situ constructed on NiFe foam (FeNiZn/FeNi @NiFe) by dealloying protocol. Coupling with eminent synergism among specific constituents highly efficient mass transport from integrated porous backbone, FeNiZn/FeNi @NiFe depicts exceptional bifunctional activities for splitting extremely low overpotentials toward OER HER ( η 1000 = 367/245 mV) as well robust durability during 400 h testing alkaline solution. as-built electrolyzer anode cathode exhibits record-high performances sustainable output terms much lower cell voltage 1.759 1.919 V to deliver current density 500 mA cm −2 long working lives. Density functional theory calculations disclose that interface interaction between generates modulated electron structure state optimized intermediate chemisorption, diminishing energy barriers production splitting. With merits fine performances, scalable fabrication, cost, holds prospective application potential electrocatalyst splitting."Image missing"

Язык: Английский

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Integrated core-shell assembly of Ni3S2 nanowires and CoMoP nanosheets as highly efficient bifunctional electrocatalysts for overall water splitting

Journal of Alloys and Compounds, Год журнала: 2023, Номер 960, С. 170678 - 170678

Опубликована: Май 27, 2023

Язык: Английский

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Sulphur-dopant induced breaking of the scaling relation on low-valence Ni sites in nickel ferrite nanocones for water oxidation with industrial-level current density

Chemical Engineering Journal, Год журнала: 2023, Номер 461, С. 141714 - 141714

Опубликована: Фев. 4, 2023

Язык: Английский

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Constructing Air-Stable and Reconstruction-Inhibited Transition Metal Sulfide Catalysts via Tailoring Electron-Deficient Distribution for Water Oxidation

ACS Catalysis, Год журнала: 2022, Номер 12(21), С. 13234 - 13246

Опубликована: Окт. 17, 2022

In promising transition metal sulfide catalysts, the extraordinary instability under air exposure and oxygen evolution reaction (OER) catalysis severely degrades their activity stability in electrochemical water splitting reaction, inhibiting practical applications. Herein, guided by a theoretical mechanism study, it is disclosed that adsorbing ability electronic interaction for molecular will be significantly weakened nickel disulfide (NiS2) constructing an electron-deficient distribution on Ni–S sites with N atom introduction, which efficiently inhibits process of O2 adsorption electrophilic activation during oxidation, thus achieving air-stable capacity NiS2. addition, calculations further reveal such redistribution weaken OH– NiS2 inhibit reconstruction OER process. Inspired this, nanosheets (NiS2 NSs) are synthesized atoms introduced to bridge Ni S, resulting S atom-bridged NSs (N–NiS2 NSs). As expected, only 28.1% phase oxidized into sulfate N–NiS2 after one month 13 mV overpotential degradation toward OER, while NSs, fast drastic transformation undergone, 155 decline. For process, from sulfides (oxy)hydroxides deservedly inhibited situ constructed N–NiS2/NiOOH heterostructure as active phase, exhibits higher compared those completely NiOOH-oxidized NSs. Rationalized density functional theory (DFT) calculations, features strong electron rearrangement at interface, improving chemisorption conductivity pristine NiOOH. Moreover, strategy also valid other (TMS) (such CoS2 FeS2).

Язык: Английский

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Next-Generation Green Hydrogen: Progress and Perspective from Electricity, Catalyst to Electrolyte in Electrocatalytic Water Splitting

Nano-Micro Letters, Год журнала: 2024, Номер 16(1)

Опубликована: Июль 5, 2024

Green hydrogen from electrolysis of water has attracted widespread attention as a renewable power source. Among several production methods, it become the most promising technology. However, there is no large-scale system currently that can compete with conventional fossil fuel production. Renewable energy electrocatalytic splitting an ideal technology environmental cleanliness protection and good purity, which meet requirements future development. This review summarizes introduces current status by three aspects: electricity, catalyst electrolyte. In particular, present situation latest progress key sources power, catalytic materials electrolyzers for are introduced. Finally, problems generation electrolytic directions next-generation green in discussed outlooked. It expected this will have important impact on field water.

Язык: Английский

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