Strategic Design for High-Efficiency Oxygen Evolution Reaction (OER) Catalysts by Triggering Lattice Oxygen Oxidation in Cobalt Spinel Oxides

ACS Nano, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 28, 2024

High-efficiency catalysts with refined electronic structures are highly desirable for promoting the kinetics of oxygen evolution reaction (OER) and enhancing catalyst durability. This study comprehensively explores strategies involving metal doping vacancies acidic OER catalytic activity Co

Язык: Английский

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FeIr Alloy Optimizes the Trade‐Off Between Nitrate Reduction and Active Hydrogen Generation for Efficient Electro‐Synthesis of Ammonia in Neutral Media

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 10, 2025

Abstract Electrochemically promoted nitrate reduction reaction (NITRR) holds great potential for the “green” synthesis of ammonia (NH 3 ). However, NITRR in neutral media, though close to practical scenario, is often limited by an insufficient supply active hydrogen (*H) due sluggish water cleavage. In this work, it demonstrated that a bimetallic alloy FeIr can optimize trade‐off between and *H formation media. As result, exhibits excellent catalytic performance toward with Faradaic efficiency NH up 97.3% high yield rate 11.67 mg h −1 cm −2 at low working −0.6 V (versus reversible electrode (RHE)), surpassing monometallic catalysts as well majority Fe‐based state‐of‐the‐art. It also found displays remarkable electron rearrangement hetero‐atoms their significant orbital hybridization, which benefits not only but process. Moreover, coupling FeIr‐based methanol oxidation (MOR) results sustainable productions formate combined FE nearly 200% cell‐voltage 2 V. This work thus demonstrates promising strategy designing efficient NITRR.

Язык: Английский

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In Situ Reconstructed Bi⁰‐Guided Electron‐Deficient Co(OH)₂ for Enhanced Electrocatalytic Nitrate Reduction to Ammonia

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 13, 2025

Abstract Electrocatalytic nitrate reduction into ammonia (NitRR) over Co‐based catalysts is attractive but still constrained by the competition with H* coupling to produce H 2 . Additionally, fundamental mechanism underlying interfacial engineering associated electronic state transformation for strengthening oriented NitRR remains elusive. Herein, a Co(OH) /Bi 12 O 17 Br heterostructure fabricated using one‐step wet chemistry method, performing remarkable reactivity NH 3 production own formation of electron‐deficiency Co sites induced Bi Unexpectedly, activity increases gradually in initial stage and then keeps at high level, which uncovered as reconstruction 0 Theoretical calculations suggest that situ guides shift d ‐band center toward Fermi thus promoting adsorption conversion intermediates. The synergistic effect hydrolysis dissociation inhibition contributes selectivity NitRR. reconstructed catalyst shows yield rate 7343.3 µg h −1 mg −0.6 V versus RHE nearly 100% Faradaic efficiency −0.4 RHE. This study provides insight

Язык: Английский

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Synergistic Cu₂O@Ni(OH)₂ Core–Shell Electrocatalyst for High-Efficiency Nitrate Reduction to Ammonia

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Апрель 23, 2025

The electrocatalytic reduction reaction of nitrate (NO3RR) is anticipated to convert nitrogen-containing pollutants into valuable ammonia products. Copper-based catalysts have received great attention because their good performance in the NO3RR due strong binding energy with *NO3 intermediates. However, poor H2O dissociation ability Cu unable provide H• time for hydrogenation NOx, thus hindering electroreduction NO3-. Herein, we designed a shell-core nanocube electrocatalyst Cu2O@Ni(OH)2-x (x represents molar ratio Ni/Cu) using liquid phase combined etching and precipitation method NO3RR. Due synergistic effect between activation excellent Ni(OH)2, Cu2O@Ni(OH)2-3.3% shows an impressive yield rate (557.9 μmol h-1 cm-2) Faradaic efficiency (97.4%) at -0.35 V vs. RHE. Operando Raman Auger electron spectroscopy observe Cu2O during process. Density functional theory calculations paramagnetic resonance analysis reveals that Ni(OH)2 can lower barrier dissociation, thereby promoting generation accelerating *NO This research provides efficient Cu-based catalyst reducing NO3- may motivate development effective electrocatalysts further experimentation.

Язык: Английский

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Catalysis Fundamental and Applied Research Advances for Green Ammonia Synthesis and Recovery

Energy & Fuels, Год журнала: 2025, Номер unknown

Опубликована: Май 6, 2025

Язык: Английский

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Tailoring the Morphology and Active Sites in Spinel Cobaltites for Efficient Production of Glycerol Carbonate

ChemCatChem, Год журнала: 2025, Номер unknown

Опубликована: Май 21, 2025

Abstract A novel strategy to synthesize micro‐structured cobaltite (ACo 2 O 4 ; = Fe, Mn, Cu) catalysts with tunable catalytic properties exhibiting highly selective production of glycerol carbonate via urea glycerolysis reaction is demonstrated. FeCo microcubes, MnCo microspheres, and CuCo micro‐octahedrons were produced an ultrasonication‐assisted hydrothermal approach. The impact (U), semicarbazide (S) as structure directing agents (SDAs), metal ion substitution (A Fe 3+ , Mn Cu 2+ ) on catalyst morphology acid–base active sites in confirmed using various material characterization techniques, such scanning electron microscopy (SEM), transmission (TEM), X‐ray diffraction (XRD), Raman spectroscopy, NH 3 CO temperature programmed desorption (TPD), photoelectron spectroscopy (XPS). enhanced resulted a significant improvement their performance, particularly terms activity selectivity. order yield (Y) selectivity for GC ‐U microcubes (Y95 ± 3%, S99%) > ‐S microspheres (Y91.5 S98.5%) (Y83.4 S92.4%) Co (Y35 99%), determined the GC‐MS analysis. This performance attributed effective activation urea, leading isocyanic acid pathway. Therefore, strategies presented this work could be further extended other spinel compounds achieve desired chemical transformations industrial interest.

Язык: Английский

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Cation Etching Induced Deep Self-Reconstruction to Form Polycrystalline Structure for Efficient Electrochemical Water Oxidation

Chemical Communications, Год журнала: 2024, Номер 60(63), С. 8220 - 8223

Опубликована: Янв. 1, 2024

In this work, we report a straightforward in situ leaching strategy to achieve rapid structure self-reconstruction of NiRu–OH/NF.

Язык: Английский

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Boosting active hydrogen generation by anchored Ru sites in Co3O4 for nitrate-to-ammonia electrosynthesis

Chem Catalysis, Год журнала: 2024, Номер unknown, С. 101152 - 101152

Опубликована: Окт. 1, 2024

Язык: Английский

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