Stable Seawater Electrolysis Over 10 000 H via Chemical Fixation of Sulfate on NiFeBa‐LDH

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 18, 2024

Abstract Although hydrogen production through seawater electrolysis combined with offshore renewable energy can significantly reduce the cost, corrosive anions in strictly limit commercialization of direct technology. Here, it is discovered that electrolytic anode be uniformly protected a environment by constructing NiFeBa‐LDH catalyst assisted additional SO 4 2− electrolyte. In experiments, achieves unprecedented stability over 10 000 h at 400 mA cm −2 both alkaline saline electrolyte and seawater. Characterizations simulations reveal atomically dispersed Ba 2+ enables chemical fixation free on surface, which generates dense layer to repel Cl − along preferentially adsorbed presence an applied electric field. terms simplicity effectiveness design, confident beacon for

Language: Английский

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In‐situ Reconstruction of Catalyst in Electrocatalysis

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 22, 2024

Abstract Reconstruction of catalysts is now well recognized as a common phenomenon in electrocatalysis. As the reconstructed structure may promote or hamper electrochemical performance, how to achieve designed active surface for highly enhanced catalytic activity through reconstruction needs be carefully investigated. In this review, genesis and effects various processes, such hydrogen evolution reaction (HER), oxygen (OER), carbon dioxide reduction (CO 2 RR), nitrate (NO 3 RR) are first described. Then, strategies optimizing reconstruction, valence states control, phase retention, engineering, poisoning prevention comprehensively discussed. Finally, general rules optimization summarized give perspectives future study. It believed that review shall provide deep insights into electrocatalytic mechanisms guide design pre‐catalysts with improved activity.

Language: Английский

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Stabilizing the Unstable: Enhancing OER Durability with 3d-Orbital Transition Metal Multielemental Alloy Nanoparticles by Atomically Dispersed 4d-Orbital Pd for a 100-Fold Extended Lifetime

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 24, 2025

Earth-abundant 3d-orbital late transition metals are the most used and highly desired catalysts for oxygen evolution reaction (OER) but prone to quick oxidative dissolution, leading poor durability. We first report that FeCoNiCu multielemental alloy nanoparticles (MEA NPs) can be stabilized with only 0.3 at. % Pd, a 4d-orbital element. Although pure Pd is known extremely OER activity durability, Pd-FeCoNiCu sustains 1000 h at 10 mA cm-2. In an accelerating durability test (ADT) 100 cm-2, it exhibits mere 8.9 mV increase over 25 degradation rate of 0.356 h-1, which 1/350th (125 h-1) among stable reported so far. Aberration-corrected HAADF-STEM X-ray absorption fine structure (XAFS) reveal atomically dispersed atoms, surrounded by Fe, Co, Ni, Cu contributed more delocalized electronic stronger bonding via strong d-d/sp hybridization vibronic coupling induced atomic displacement. The altered local density states (LDOS) mitigates oxidation in 50%, quantified hard photoelectron spectroscopy (HAXPES), making combination these five dissoluble elements durable catalyst.

Language: Английский

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Facet Engineering of Metal‐Organic Frameworks for Triboelectric Nanogenerators‐Based Self‐Powered Water Splitting

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

Abstract Metal‐organic frameworks (MOFs) are highly versatile materials with tunable chemical and structural properties, making them promising for triboelectric nanogenerators (TENGs) electrocatalysis. However, achieving precise control over MOF coordination structures to optimize facet‐dependent properties remains challenging. Here, a facile scalable dual‐solvent synthesis strategy is presented fabricate dendrite Co‐2‐methylimidazole (ZIF‐67‐D), enabling tailored preferred facet environments. Using density functional theory (DFT) calculations synchrotron‐based X‐ray absorption spectroscopy, it demonstrated that ZIF‐67‐D, enriched (112) facets, features reduced Co number enhanced electron‐donating ability compared the conventionally (011) facet‐dominated rhombic dodecahedron ZIF‐67 (ZIF‐67‐R). This engineering boosts TENG charge by 2.4‐fold, OER current 9.9‐fold (@1.65 V), HER 1.9‐fold (@‐0.3 V). The (112)/(011) ratio can be also tuned precisely alter output. Moreover, optimized ZIF‐67‐D shows excellent stability, maintaining electrolyzer performance 72 h devices even in high humidity. Consequently, ZIF‐67‐D‐based (D‐TENG) exhibit robust energy generation power ZIF‐67‐D||ZIF‐67‐D electrolyzers continuous hydrogen (H 2 ) production. These findings introduce new paradigm converting mechanical into sustainable energy, offering insights high‐performance harvesting systems.

Language: Английский

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The breakthrough of oxide pathway mechanism in stability and scaling relationship for water oxidation

National Science Review, Journal Year: 2024, Volume and Issue: 11(11)

Published: Oct. 15, 2024

ABSTRACT An in-depth understanding of electrocatalytic mechanisms is essential for advancing electrocatalysts the oxygen evolution reaction (OER). The emerging oxide pathway mechanism (OPM) streamlines direct O–O radical coupling, circumventing formation vacancy defects featured in lattice (LOM) and bypassing additional intermediates (*OOH) inherent to adsorbate (AEM). With only *O *OH as intermediates, OPM-driven stand out their ability disrupt traditional scaling relationships while ensuring stability. This review compiles latest significant advances OPM-based electrocatalysis, detailing design principles, synthetic methods, sophisticated techniques identify active sites pathways. We conclude with prospective challenges opportunities electrocatalysts, aiming advance field into a new era by overcoming constraints.

Language: Английский

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Bubble‐Guidance Breaking Gas Shield for Highly Efficient Overall Water Splitting

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(41)

Published: Aug. 13, 2024

Abstract Overall water splitting is a promising technology for sustainable hydrogen production, but the primary challenge removing bubbles from electrode surface quickly to increase production. Inspired by directional fluid transport properties of natural biological surfaces like Nepenthes peristome and Morpho butterfly's wings, here strategy demonstrated achieve highly efficient overall bubble‐guidance electrode, that is, an anisotropic groove‐micro/nanostructured porous (GMPE). Gradient groove micro/nanostructures on GMPE serve as high‐speed bubble transmission channels exhibit superior capabilities. The synergistic effect asymmetric Laplace pressure generated between microscale structure patterns buoyancy along pushes produced directionally spread, transport, detach in time. Moreover, low adhesive nanosheet arrays are beneficial reduce size release frequency, which cooperatively improve mass transfer with structure. Notably, outperforms planar‐micro/nanostructured (PMPE) hydrogen/oxygen evolution reactions, GMPE||GMPE showing better performance than commercially available RuO 2 ||20 wt.% Pt/C. This work improves electrodes kinetics electrochemical reactions at solid‐liquid‐gas interfaces, offering insight designing preparing gas‐involved photoelectrochemical electrodes.

Language: Английский

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NiFe‐Based Electrocatalysts for Alkaline Oxygen Evolution: Challenges, Strategies, and Advances Toward Industrial‐Scale Deployment

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 2, 2024

Abstract Developing high‐efficiency alkaline water splitting technology holds great promise in potentially revolutionizing the traditional petrochemical industry to a more sustainable hydrogen economy. Importantly, oxygen evolution reaction (OER) accompanied at anode is considered as critical bottleneck terms of both complicated mechanism and sluggish kinetics, requiring rational design OER electrocatalysts elucidate structure‐performance relationship reduce applied overpotential. As benchmarked non‐precious metal candidate, NiFe‐based have gained enormous attention due low‐cost, earth‐abundance, remarkable intrinsic activity, which are expected be implemented industrial splitting. In this contribution, comprehensive overview provided, starting with fundamental mechanisms, evaluation metrics, synthetic protocols. Subsequently, basic principles corresponding regulatory strategies summarized following sequence substrate‐catalyst‐electrolyte efficient robust toward industrial‐scale deployment. Perspectives on remaining challenges instructive opportunities booming field finally discussed.

Language: Английский

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Coordination Stabilization of Fe by Porphyrin‐Intercalated NiFe‐LDH Under Industrial‐Level Alkaline Conditions for Long‐Term Electrocatalytic Water Oxidation

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 24, 2024

Abstract The durable and economic electrocatalysts with high current density under industrial alkaline conditions are critical for advancing the production of hydrogen energy by water electrolysis. highly electrolyte exacerbates Fe dissolution NiFe layered double hydroxide (NiFe‐LDH), leading to dramatic degradation stability activity. NiFe‐LDH intercalated Tetrakis(4‐carboxyphenyl)porphyrin (TCPP) (NiFe‐TCPP), 1,4,7,10‐Tetraazacyclododecane‐1,4,7,10‐tetraacetic acid (DOTA) (NiFe‐DOTA) CO 3 2− (NiFe‐CO ) fabricated respectively electrocatalytic oxidation conditions. In 10 m KOH, compared NiFe‐DOTA (335.0 mV) NiFe‐CO (499.2 mV), resultant NiFe‐TCPP exhibits lowest overpotentials 290.2 mV at 1000 mA cm −2 . also operates continuously h 500 near‐zero attenuation. theoretical experimental studies reveal that strong coordination between conjugated carboxylate ligand TCPP laminate inhibits leaching increasing barriers 4.29 eV improving self‐healing ability, thus enhancing stability. Furthermore, charge redistribution induced optimizes d‐band centers (‐2.81 eV) decreases reaction (1.47 eV), thereby catalytic

Language: Английский

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Advances in Stability of NiFe‐Based Anodes toward Oxygen Evolution Reaction for Alkaline Water Electrolysis

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 23, 2024

Abstract Alkaline electrolysis plays a crucial role in sustainable energy solutions by utilizing electrolytic cells to produce hydrogen gas, providing clean and efficient method for storage conversion. Efficient, stable, low‐cost electrocatalysts the oxygen evolution reaction (OER) are essential facilitate alkaline water on commercial scale. Nickel‐iron‐based (NiFe‐based) transition metal considered most promising non‐precious catalysts OER due their low cost, abundance, tunable catalytic properties. Nevertheless, majority of existing NiFe‐based suffer from limited activity poor stability, posing significant challenge meeting industrial applications. This also highlights common situation where emphasis material receives attention, while equally critical stability aspect is often underemphasized. Initiating with comprehensive exploration materials, this article first summarizes debate surrounding determination active sites electrocatalysts. Subsequently, degradation mechanisms recently reported outlined, encompassing assessments both chemical mechanical endurance, along approaches enhancing stability. Finally, suggestions put forth regarding considerations design electrocatalysts, focus heightened

Language: Английский

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Ions‐Migration‐Mediated Structural Stabilization in NiFe (Oxy)Hydroxides for Durable Alkaline Water Electrolysis

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 16, 2025

Abstract Elevating iron‐involved sites in NiFe (oxy)hydroxides significantly accelerates oxygen evolution reaction (OER) kinetics but often sacrifices stability due to extensive metal ablation during industrial electrolysis. Here, an ions migration‐induced stabilization strategy is introduced explore robust catalysts for OER. The present approach involving cathodic polarization of Fe‐rich NiFe‐layered double hydroxides (LDH) facilitates selective substitution Ni with Fe cations and deep oxyanions OH ‐ , leading decreased layer thickness, enriched sites, aggravated lattice distortion reorganized NiFe‐LDH (R‐NiFe‐LDH). Correspondingly, R‐NiFe‐LDH fully transforms into γ‐(NiFe)OOH retained nanosheet morphology, reduced distortions, dramatically inhibited dissolution prolonged It achieves exceptional durability at 500 mA cm −2 retaining ≈90% over 5 days, substantially outperforming pristine (50% loss). Over 2 months, delivers only a 70 mV overpotential increase, whereas decays by 140 just 75 h. An anion exchange membrane water electrolyzer applying as both electrodes exhibit zero decay 1000 100 h, compared rate 3.6 h −1 the counterpart. This work showcases straightforward engineering atomic arrangements toward

Language: Английский

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