Carbon Oxyanion Self‐Transformation on NiFe Oxalates Enables Long‐Term Ampere‐Level Current Density Seawater Oxidation

Angewandte Chemie International Edition, Год журнала: 2023, Номер 63(1)

Опубликована: Ноя. 23, 2023

Seawater electrolysis is an attractive way of making H2 in coastal areas, and NiFe-based materials are among the top options for alkaline seawater oxidation (ASO). However, ample Cl- can severely corrode catalytic sites lead to limited lifespans. Herein, we report that situ carbon oxyanion self-transformation (COST) from oxalate carbonate on a monolithic NiFe micropillar electrode allows safeguard high-valence metal reaction ASO. In situ/ex studies show spontaneous, timely, appropriate COST safeguards active against attack during ASO even at ampere-level current density (j). Our catalyst shows efficient stable performance, which requires overpotential as low 349 mV attain j 1 A cm-2 . Moreover, with protective surface CO32- exhibits slight activity degradation after 600 h under seawater. This work reports effective design concepts level self-transformation, acting momentous step toward defending seawater-to-H2 conversion systems.

Язык: Английский

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Trends and Prospects of Bulk and Single‐Atom Catalysts for the Oxygen Evolution Reaction

Advanced Energy Materials, Год журнала: 2023, Номер 13(17)

Опубликована: Март 20, 2023

Abstract Electrolytic hydrogen is expected to play a key role in the production of green fuels and chemicals, while contributing balancing consumption supply future electricity grid relying largely on intermittent renewable sources for energy production. However, oxygen evolution reaction (OER) major bottleneck boosting conversion efficiency due sluggish kinetics four‐electron transfer process. Intensive research efforts are thus directed toward development advanced OER electrocatalysts. This review aims at bringing together recent advances bulk single‐atom electrocatalysts (SACs) OER. Starting from established understanding mechanism, it offers an overview state‐of‐the‐art materials OER, highlighting current directions shortcomings The final part addresses novel SACs, covering their performance as well synthetic routes characterization techniques that shine light geometric electronic configuration SACs. experimental findings complimented with theoretical insights density functional theory (DFT). article concludes summary along opportunities further improve activity SACs

Язык: Английский

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Defect and interface engineering of hexagonal Fe2O3/ZnCo2O4 n-n heterojunction for efficient oxygen evolution reaction

Applied Catalysis B Environment and Energy, Год журнала: 2023, Номер 333, С. 122813 - 122813

Опубликована: Апрель 25, 2023

Язык: Английский

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Unraveling the Mechanism of Self-Repair of NiFe-Based Electrocatalysts by Dynamic Exchange of Iron during the Oxygen Evolution Reaction

ACS Catalysis, Год журнала: 2023, Номер 13(22), С. 14975 - 14986

Опубликована: Ноя. 6, 2023

Understanding the mechanism of catalyst surface evolution during continuous oxygen reaction (OER) process is critical to optimize stability. Here, by detailed insights into activity and stability variations NiFe-based catalysts including NiFe alloy layered double hydroxides (NiFe-LDH) for OER, we reveal that electrocatalysts possess ability repair themselves OER in an alkaline medium via balance dynamic Fe exchange between electrolytes. When concentration leached from electrolyte reaches a moderate level, sufficient amount can be readsorbed onto reconstituted oxyhydroxide, resulting loss rates. In situ Raman experiments doping Ni-based inhibit excess oxidation Ni; surface-adsorbed species strongly adsorbed formed NiOOH layer which further improves stabilizes catalysts. This analyzed isotope-labeled differential electrochemical mass spectrometry theoretical calculation, showed adsorption on oxyhydroxide promote weak-bonding Fe(OH)x as priority participant O2 formation through lattice mechanism, reducing inner NiFe-LDH structure realizing self-repairing activity. work provides more in-depth analysis actual self-repair media.

Язык: Английский

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Iron Oxyhydroxide: Structure and Applications in Electrocatalytic Oxygen Evolution Reaction

Advanced Functional Materials, Год журнала: 2023, Номер 33(25)

Опубликована: Март 10, 2023

Abstract Oxygen evolution reaction (OER) is the anodic half‐reaction for crucial energy devices, such as water electrolysis, metal–air battery, and electrochemical CO 2 reduction. Fe‐based materials are recognized one of most promising electrocatalysts OER because its extremely low price high activity. In particular, iron oxyhydroxide (FeOOH) not only highly active toward OER, but also widely accepted true species plenty converted into FeOOH during test. Herein, recent advances FeOOH‐based nano‐structure application in reviewed. The relationship between structure catalytic performance, followed by introduction current strategies enhancing activity (i.e., crystalline phase engineering, element doping, construction hybrid materials) mainly focused. Finally, a summary perspective about remaining challenges future opportunities this area further design provided.

Язык: Английский

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Seed-assisted formation of NiFe anode catalysts for anion exchange membrane water electrolysis at industrial-scale current density

Nature Catalysis, Год журнала: 2024, Номер 7(8), С. 944 - 952

Опубликована: Авг. 13, 2024

Язык: Английский

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Structural modulation of low-valent iron in LDH-derived Ni₃Se₄nanosheets: a breakthrough electrocatalyst for the overall water splitting reaction

Journal of Materials Chemistry A, Год журнала: 2023, Номер 11(20), С. 10684 - 10698

Опубликована: Янв. 1, 2023

Here an LDH-derived microporous Fe@Ni 3 Se 4 with enriched redox active Fe 2+ ion is reported. The same has acquired 10 mA cm −2 current density 185 and 33 mV of overpotential value in alkaline condition high specific activity durability.

Язык: Английский

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Ultrafine Homologous Ni₂P–Co₂P Heterostructures via Space‐Confined Topological Transformation for Superior Urea Electrolysis

Advanced Functional Materials, Год журнала: 2023, Номер 33(42)

Опубликована: Июнь 21, 2023

Abstract Constructing effective electrocatalysts based on ultrafine heterostructures is a promising strategy for boosting catalytic performance by exposing active sites and increasing specific surface area. However, the fabrication of catalytically with elaborate architectures still poorly developed owing to synthetic challenges, intrinsic mechanism heterogeneous interfaces remains unclear because insufficient evidence regarding real sites. In this study, homologous Ni 2 P–Co P (Ni P/C) are created using topological transformation from Ni–Co layered double hydroxide/carbon (Ni–Co LDH/C) interconnected structure in single nanosheet. When employed as catalysts urea oxidation reaction (UOR), P/C exhibit superior activity stability, attributed optimized geometric electronic structures Specifically, it takes an ultralow potential 1.27 V reach current density 10 mA cm −2 small Tafel slope 28.71 mV dec −1 . The operando analyses calculation results reveal that cobalt incorporation can reduce generation reconstructive species optimize absorption/desorption energy intermediates. Overall, study proposes efficient cost‐effective UOR electrocatalyst offers new high‐performance heterostructure design widespread application.

Язык: Английский

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Construction of Ni2P-NiFe2O4 heterostructured nanosheets towards performance-enhanced water oxidation reaction

Applied Catalysis B Environment and Energy, Год журнала: 2023, Номер 339, С. 123141 - 123141

Опубликована: Авг. 1, 2023

Язык: Английский

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Construction of nickel phosphide/iron oxyhydroxide heterostructure nanoparticles for oxygen evolution

Nano Energy, Год журнала: 2024, Номер 123, С. 109402 - 109402

Опубликована: Фев. 21, 2024

Язык: Английский

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