Improving Charge Transfer Kinetics of Ni Hydroxide Through Chromium: Efficient Production of Benzoic Acid at Ampere‐Level Current Density

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

Abstract Hybrid water electrolysis with the simultaneous generation of hydrogen and value‐added chemicals enhances viability process. A remarkably high current density 1.4 cm −2 toward benzyl alcohol oxidation (BOR) at a low potential 1.45 V reported in this work suggests that oxygen evolution reaction (OER) can be replaced BOR by selecting suitable catalyst. chromium oxide‐treated Ni foam (Cr‐NF) synthesized through simple hydrothermal route offers 100% conversion 99.5% faradaic efficiency benzoic acid. The surface nature NF is significantly modified oxide, known for its hydrophilic pore‐forming abilities, resulting enhanced active sites. In situ Raman analysis confirms reversible electrochemical hydroxides to NiOOH, which converts (BA) acid (PhCOOH) chemical oxidation. theoretical accelerated electronic transport lower free energy sorption intermediates utilizing Cr 2 O 3 /NiOOH surface. two‐electrode arrangement, Cr‐NF demonstrates excellent performance, achieving 2.5 an applied 3.1 V, highly significant compared OER‐based systems. This system further studied commercial applications.

Language: Английский

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Electrochemical N–N Oxidatively Coupled Dehydrogenation of 3,5-Diamino-1H-1,2,4-triazole for Value-Added Chemicals and Bipolar Hydrogen Production

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

Published: March 8, 2025

Electrochemical H2 production from water favors low-voltage molecular oxidation to replace the oxygen evolution reaction as an energy-saving and value-added approach. However, there exists a mismatch between high demand for slow anodic reactions, restricting practical applications of such hybrid systems. Here, we propose bipolar approach, with generation N–N oxidatively coupled dehydrogenation (OCD) 3,5-diamino-1H-1,2,4-triazole (DAT), in addition cathodic generation. The system requires relatively low potentials 0.872 1.108 V vs RHE reach 10 500 mA cm–2, respectively. H-type electrolyzer only 0.946 1.129 deliver 100 respectively, electricity consumption (1.3 kWh per m3 H2) reduced by 68%, compared conventional splitting. Moreover, process is highly appealing due absence traditional hazardous synthetic conditions azo compounds at anode crossover/mixing H2/O2 electrolyzer. A flow-type operates stably cm–2 300 h. Mechanistic studies reveal that Pt single atom nanoparticle (Pt1,n) optimize adsorption S active sites over Pt1,n@VS2 catalysts. At anode, stepwise −NH2 DAT then oxidative coupling −N–N– predominantly form while generating H2. present report paves new way atom-economical aminotriazole green electrosynthesis chemicals.

Language: Английский

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Bridge‐Oxygen Bond: An Active Group for Energy Electrocatalysis

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

Published: March 20, 2025

Abstract Energy electrocatalytic reactions such as hydrogen evolution reaction, oxygen reduction nitrogen carbon etc., are important to solve the current energy shortage and increasing environmental problems. Developing novel efficient catalyts for these has become an essential urgent issue. Catalysts incorporating bridge‐oxygen bond have received attention due their superior conductivity stability, which favorable optimizing reaction mechanism improving kinetics. This paper provides a comprehensive review encompassing concept of bond, means characterization, activity in electrocatalysis effect on catalytic performance. Through this review, it is expected furnish valuable reference rational design catalysts featuring structure across diverse reactions.

Language: Английский

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Synergetic Oxidized Mg and Mo Sites on Amorphous Ru Metallene Boost Hydrogen Evolution Electrocatalysis

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

Published: March 21, 2025

Ruthenium (Ru) is considered as a promising catalyst for the alkaline hydrogen evolution reaction (HER), yet its weak water adsorption ability hinders splitting efficiency. Herein, concept of introducing oxygenophilic MgOx and MoOy species onto amorphous Ru metallene demonstrated through simple one-pot salt-templating method synergic promotion to greatly enhance HER electrocatalysis. The atomically thin on (MgOx/MoOy-Ru) show 15.3-fold increase in mass activity at potential 100 mV than that an ultralow overpotential 8.5 current density 10 mA cm-2. It further MgOx/MoOy-Ru-based anion exchange membrane electrolyzer can achieve high cm-2 remarkably low cell voltage 1.55 V, exhibit excellent durability over 60 h 500 In situ spectroscopy theoretical simulations reveal co-introduction enhances interfacial by promoting oxidized Mg sites lowering dissociation energy barrier Mo sites.

Language: Английский

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Sandwich-like Hybrid Electrospun Membrane-Based Efficient Hydrogen Evolution System by the Push–Pull Double Piezoelectric Effect Driven by Water Flow

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

An efficient photocatalytic hydrogen evolution is realized by a push-pull effect from the piezoelectricity of flexible hybrid membrane introduced via water flow energy. The possesses sandwich-like structure, prepared sequentially electrospinning poly(vinylidene fluoride) (PVDF), depositing graphitic carbon nitride with Pt atoms (g-C3N4@Pt), and again PVDF. Due to piezoelectric property PVDF, deformation obtained PVDF/g-C3N4@Pt/PVDF triggers two electric fields same direction in top bottom PVDF membranes. Therefore, either electrons or holes photogenerated g-C3N4@Pt are attracted one field repelled another. This induces directional movement charge carriers, which not only eases separation but also hinders recombination. Based on this favorable finite element simulations for stress distribution membrane, position optimized. rate strongly increases 5401 μmol h-1 g-1 under flow, 240% that nanosheets. Thus, very suitable production natural aqueous environments rich solar energy, such as lakes rivers.

Language: Английский

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Local Electronic Regulation by Oxygen Coordination with Single- Atomic Iridium on Ultrathin Cobalt Hydroxide Nanosheets for Electrocatalytic Oxygen Evolution

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 27, 2025

Rationally optimizing the atomic and electronic structure of electrocatalysts is an effective strategy to improve activity electrocatalytic oxygen evolution reaction (OER), yet it remains challenging. In this work, heterointerface engineering developed accelerate OER by decorating iridium atoms on low-crystalline cobalt hydroxide nanosheets (Ir–Co(OH)x) via oxygen-coordinated bonds modulate local structure. Leveraging detailed spectroscopic characterizations, Ir species were proved promote charge transfer through Ir–O–Co coordination between atom Co(OH)x support. As a result, optimized Ir–Co(OH)x exhibits excellent with low overpotential 251 mV drive 10 mA cm–2, which 63 lower than that pristine Co(OH)x. The experimental results density functional theory calculations reveal isolated can regulate environment configuration Co(OH)x, thus accelerating catalytic kinetics. This work provides atomistic for modulation metal active sites in design high-performance electrocatalysts.

Language: Английский

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Ru Single Atoms Anchored on Co₃O₄ Nanorods for Efficient Overall Water Splitting under pH‐Universal Conditions

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

Published: April 2, 2025

Abstract Single‐atom catalysts (SACs) show great promise for electrocatalytic water splitting due to their exceptional metal atom utilization efficiency. Herein, it is demonstrated that Ru single atoms (SAs) anchored on Co 3 O 4 nanorod arrays (Ru x ‐Co , where the loading in weight percent) afford outstanding performance and durability oxygen evolution reaction (OER), hydrogen (HER), overall across a wide pH range (0.3–14). 8% achieves 10 mA cm⁻ 2 at overpotentials of only 214, 286, 138 mV OER, 13, 72, 59 HER, 1 m KOH, 0.1 PBS, 0.5 H SO respectively, outperforming benchmark RuO Pt/C catalysts. When utilized as anode cathode an anion exchange membrane electrolyzer (AEMWE), cell voltage 2.06 V required achieve A . Chronopotentiometry verified possesses excellent stability during both OER HER 100 acidic, neutral, alkaline media. Density functional theory (DFT) calculations reveal abundant Ru‐O‐Co interfaces shift d‐band center from −1.72 eV (for cluster/Co ) −1.58 SA/Co ), creating more energetically favorable pathways HER.

Language: Английский

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POM-Intercalated NiFe-LDH as Enhanced OER Catalyst for Highly Efficient and Durable Water Electrolysis at Ampere-Scale Current Densities

ACS Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 6486 - 6496

Published: April 6, 2025

Language: Английский

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Stable Ni(II) sites in Prussian blue analogue for selective, ampere-level ethylene glycol electrooxidation

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: April 11, 2025

Language: Английский

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D‐Orbital‐Modulated Ruthenium Embedded within Functionalized Hollow MXene Networks for Enhanced Hydrazine‐Assisted Hydrogen Production

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 18, 2025

Abstract Electrochemical green hydrogen production via water splitting is an attractive and sustainable pathway; however, the sluggish kinetics of anodic oxygen evolution reaction still a critical challenge. In this study, effective electrocatalyst engineering approach demonstrated by preparing innovative hybrid ruthenium d‐orbitals‐regulated nanoclusters embedding within functionalized hollow Ti 3 C 2 MXene networks (Ru 0.91 Ni 0.09 ‐N/O‐Ti ) to promote hydrazine‐assisted production. A specific charge redistribution revealed, locally concentrating at interfaces derived from stable Ru(Ni)‐N/O‐Ti coordination d – p orbital hybridization. The transfer effect Ru structure N/O‐Ti tailors electronic features sites enable reasonable adsorption/desorption toward reactant intermediates. requires overpotential only 29.3 mV for cathodic low potential −29.9 hydrazine oxidation reach 10 mA cm −2 , showing excellent stability. system based on electrodes delivers small cell voltages 0.02 V 0.92 industrial current level 1.0 . This work may open new electrocatalysis strategy lab scale industry robust efficient

Language: Английский

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