Strained Au skin on Mesoporous Intermetallic AuCu₃ Nanocoral for Electrocatalytic Conversion of Nitrate to Ammonia across a Wide Concentration Range

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(36)

Опубликована: Июнь 20, 2024

Electrochemical nitrate reduction reaction (NitRR) uses from wastewater, offering a hopeful solution for environmental issues and ammonia production. Yet, varying levels in real wastewater greatly affect NitRR, slowing down its multi-step process. Herein, multi-strategy approach was explored through the design of ordered mesoporous intermetallic AuCu

Язык: Английский

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Regioselective Doping into Atomically Aligned Core–Shell Structures for Electrocatalytic Reduction of Nitrate to Ammonia

Advanced Energy Materials, Год журнала: 2024, Номер 14(46)

Опубликована: Авг. 26, 2024

Abstract The electrochemical nitrate reduction reaction (NO 3 − RR) presents an environmentally friendly approach for efficient NO pollutant removal and ammonia (NH ) production, compared to the conventional Haber–Bosch approach. While core/shell engineering has demonstrated its potential in enhancing RR performance, significant synthetic challenges limited shell layer modification capabilities impede exploration of high‐performance catalysts. Herein, CuCoO/Co(OH) 2 structure via situ activation is synthesized. catalyst delivers a maximum NH Faradaic efficiency (FE) 94.7% at −0.5 V RHE with excellent durability selectivity over wide range potentials RR, surpassing electrocatalytic performance both undoped core components. outstanding Cu─CoO/Co(OH) ascribed enhanced charge transfer, stabilization key intermediates, regulation hydrogen adsorption Cu‐doped structure. Furthermore, assembled Zn−NO battery device attains peak current density exceeding 32 mA cm −2 yield up 145.4 µmol h −1 . work offers novel strategy sheds light on doping effects synthesis.

Язык: Английский

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Layered double hydroxide-based nanomaterials for supercapacitors and batteries: Strategies and mechanisms

Progress in Materials Science, Год журнала: 2024, Номер unknown, С. 101410 - 101410

Опубликована: Дек. 1, 2024

Язык: Английский

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In Situ Reconstructed Cu/β‐Co(OH)₂ Tandem Catalyst for Enhanced Nitrate Electroreduction to Ammonia in Ampere‐Level

Advanced Energy Materials, Год журнала: 2024, Номер 14(41)

Опубликована: Авг. 7, 2024

Abstract The electrochemical nitrate reduction for green ammonia production is attracting increasing attention, where the catalysts are widely investigated by controlling compositions or structures to achieve high performance. However, their reconstructions under potentials inevitable and uncontrollable, leading uncertain performance, a confused understanding of mechanism. In this work, strategy proposed pre‐catalyst's reconstruction chemistry toward reaction (e‐NO 3 RR) with superior activity stability. To demonstrate idea, pre‐catalyst fabricated α ‐Co(OH) 2 Cu(OH) ( /Cu(OH) ), which in situ reconstructed tandem catalyst Cu β (Cu/ β‐ Co(OH) ) working potential. Cu/ achieves an optimal Faraday efficiency 97.7% yield rate 3.9 mmol h −1 cm −2 at −0.5 V, outperforming other reported metal‐hydroxide catalysts. experimental theoretical results that catalytic mechanism responsible exceptional performance: 1) functions as donor nitrite; 2) serves active sites generating hydrogen reducing nitrogen‐containing groups. This work highlights controllable improved performance can be realized, provides insightful mechanism, helpful developing stable various applications.

Язык: Английский

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Highly Efficient Electrocatalytic Nitrate Reduction to Ammonia: Group VIII-Based Catalysts

ACS Nano, Год журнала: 2024, Номер unknown

Опубликована: Окт. 4, 2024

The accumulation of nitrates in the environment causes serious health and environmental problems. electrochemical nitrate reduction reaction (e-NO

Язык: Английский

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Engineering Ce Promoter to Regulate H^* Species to Boost Tandem Electrocatalytic Nitrate Reduction for Ammonia Synthesis

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 5, 2025

Abstract The renewable‐energy‐powered electroreduction of nitrate (NO 3 RR) to ammonia emerges as a generalist for contamination remediation, green synthesis, and even advanced energy conversion, garnering significant interest. However, it comes across limited yield selectivity due the imbalance active hydrogen (H * ) supply within cutting‐edge single‐center Cu‐based materials. Herein, secondary Ce entity is engineered into Cu/MoO 2 @C substrate by thermal treatment Ce‐doping NENU‐5 precursors provide H effectively. A high NH rate (20.3 ± 0.7 mg h −1 cat. NO − −to−NH Faradaic efficiency (92 3%) at −0.4 V (vs RHE) can be reached in 5%Ce‐Cu/MoO @C, ranking among recently reported state‐of‐the‐art catalysts. core this boosting performance lies dual‐site tandem catalysis, which Cu site adsorbs activates , dissociates water generate respectively. And spillover from vicinal x intermediates on promotes hydrogenation generation with selectivity. Theoretical calculations further indicate that engineering optimizes electronic properties, activation adsorbed decreases barrier rate‐determining step catalysis. These findings consolidate positive role rare earth center highlight its corresponding catalysis sustainable synthesis.

Язык: Английский

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Tailoring Electronic and Morphology Features of Iron‐Doped Ni₂P Nanoflowers for Enhanced Ammonia Electrosynthesis in Solid Electrolyte Reactors

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 13, 2025

Abstract Electrochemical nitrate (NO 3 − ) reduction to ammonia (NH presents a promising route for both wastewater treatment and generation but still suffers from sluggish catalytic activity, insufficient mass transfer, the reliance on high‐concentration supporting electrolytes. This work reports an innovative efficient electrosynthesis reactor by integrating self‐assembled iron‐doped Ni 2 P (Fe‐Ni P/NF) nanoflower cathode with solid‐electrolyte (SE). The SE design eliminates need electrolytes, providing highly ion‐conducting pathway enabling direct production of NH NO . Through tailoring electronic surface characteristics Fe‐Ni P/NF, this achieves complete reduction, 96.7% selectivity, 81.8% faradaic efficiency concentration 100 m at current density mA −2 Density functional theory (DFT) calculations reveal that phosphating Fe doping synergistically enhance adsorption increase availability active hydrogen, thus favoring low energy barrier 0.695 eV. Additionally, superhydrophilicity P/NF catalyst promotes transfer facilitating electrolyte access ensuring rapid gas bubble release. study provides sustainable scalable method converting ‐laden into valuable products.

Язык: Английский

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Two-dimensional materials for NOx reduction to ammonia: From electrocatalyst to system

Coordination Chemistry Reviews, Год журнала: 2025, Номер 535, С. 216610 - 216610

Опубликована: Март 21, 2025

Язык: Английский

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Facet-Dependent Evolution of Active Components on Spinel Co₃O₄ for Electrochemical Ammonia Synthesis

ACS Nano, Год журнала: 2024, Номер 18(33), С. 22344 - 22355

Опубликована: Авг. 6, 2024

Spinel cobalt oxides (Co

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Selective Reduction of Aqueous Nitrate to Ammonium with an Electropolymerized Chromium Molecular Catalyst

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(11), С. 7439 - 7455

Опубликована: Март 11, 2024

Nitrate (NO3–) is a common nitrogen-containing contaminant in agricultural, industrial, and low-level nuclear wastewater that causes significant environmental damage. In this work, we report bioinspired Cr-based molecular catalyst incorporated into redox polymer selectively efficiently reduces aqueous NO3– to ammonium (NH4+), desirable value-added fertilizer component industrial precursor, at rates of ∼0.36 mmol NH4+ mgcat–1 h–1 with >90% Faradaic efficiency for NH4+. The reduction reaction occurs through cascade catalysis mechanism involving the stepwise via observed NO2– NH2OH intermediates. To our knowledge, one first examples catalyst, homogeneous or heterogenized, reported reduce efficiencies comparable those state-of-the-art solid-state electrocatalysts. This work highlights promising previously unexplored area electrocatalyst research using polymer–catalyst composites containing complexes oxophilic transition metal active sites electrochemical nitrate remediation nutrient recovery.

Язык: Английский

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