Purification and Value-Added Conversion of NO_x under Ambient Conditions with Photo-/Electrocatalysis Technology

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 6, 2025

As primary air pollutants from fossil fuel combustion, the excess emission of nitric oxides (NOx) results in a series atmospheric environmental issues. Although selective catalytic reduction technology has been confirmed to be effective for NOx removal, green purification and value-added conversion under ambient conditions are still facing great challenges, especially nitrogen resource recovery. To address that, photo-/electrocatalysis offers sustainable routes efficient upcycling temperature pressure, which received considerable attention scientific communities. In this review, recent advances critically summarized. The target products reaction mechanisms systems, together with responsible active sites, discussed, respectively. Then, realistic practicability is proposed, including strict performance evaluation criteria application by photo-/electrocatalysis. Finally, current challenges future opportunities proposed terms catalyst design, enhancement, mechanism understanding, practical conditions, product separation techniques.

Language: Английский

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Efficient Photoelectrocatalytic Synthesis of Ammonia by Superionic Conductor with Mixed Ion/Electron Conduction

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

Published: March 25, 2025

Photoelectrochemical (PEC) nitrate reduction shows substantial potential for solar-to-ammonia (NH3) conversion. However, low electron density and disordered conduction of conventional catalysts result in limited performance Faraday efficiency. Herein, a FePS2.66Li0.87 superionic conductor (SIC) is developed by introducing lithium ions into van der Waals immobile layered FePS3 catalyst. This crystal framework facilitates high-concentration confinement long-range diffusion at room temperature, transitioning the mechanism from electronic to mixed ionic/electronic. The typical nanofluidic ion transport leads high ionic conductivity 16.4 mS cm-1 temperature enhanced 5 × 10-6 S cm-1. Furthermore, mobile within interlayers enhance interaction between low-lying 3dyz orbitals Fe interacting with 2a2 empty antibonding NO3 -. An excellent PEC ammonia production 134.18 µmol cm-2 h-1 96.95% Faradaic efficiency achieved, corresponding solar-to-NH3 57.13% offers promising pathway toward sustainable production.

Language: Английский

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Photoenhanced Electrochemical Conversion of Nitrate to Ammonia Via Sulfur Vacancy-Rich Exfoliated MoS₂

ACS Catalysis, Journal Year: 2024, Volume and Issue: unknown, P. 18085 - 18094

Published: Nov. 22, 2024

Nitrate ion is a common pollutant in surface and groundwater. Hence, its catalytic conversion into ammonia at ambient conditions by electrochemical photoelectrochemical pathways an attractive alternative to current production from the energy-intensive high-carbon-featuring Haber-Bosch process. As such, developing highly active product-selective catalysts with good durability cost-effectiveness desired. In this work, exfoliated MoS2-x reported as selective electrocatalyst photoelectrocatalyst for nitrate reduction ammonia. Exfoliation via acid treatment of bulk MoS2 results MoS2-x, which only few layers thick has high degree sulfur vacancies (ca. 12−13%). Electrochemical studies electrolysis product analysis reveal promising activity, found be enhanced application visible light illumination. The achieves Faradaic efficiency 69% yield rate 5.56 mmol gcat–1 h–1 absence source, 80% 7.48 upon DFT calculations support binding other NOx species vacancies, resulting formation *N, then reduced

Language: Английский

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Sulfur Defect Tuning of CuS/BiVO₄ and Understanding the Function of Hydrogen Radicals for Photoelectrochemical Ammonia Production

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

Published: Feb. 21, 2025

Photoelectrochemical nitrate reduction has been a promising method for ammonia (NH3) production under normal temperatures and neutral conditions. However, hydrogenation is key process in the selective of NH3 during reduction; therefore, inducing active hydrogen inhibiting are noteworthy problem. In this study, BiVO4/CuS (BVO/CS) heterostructure constructed photoelectrochemical reaction (PEC NIRR). The introduction CuS optimizes electron-transfer ability enhances surface catalytic kinetics BVO/CS. At same time, presence sulfur vacancies on promotes adsorption activation nitrate, realizes splitting H2O, successfully generates abundant radicals (H*). generated H* effectively utilized NIRR. yield selectivity optimal BVO/CS reach 30.55 μg h-1 cm-2 43.8%, respectively, which 2.65 2.39 times that bare BVO. Therefore, work determines role hydrogenation, providing novel strategy boosting PEC CuS/BiVO4 was fabricated reduction. Sulfur defects enabled generation radicals, promoted production.

Language: Английский

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Rational electrocatalyst design for selective nitrate reduction to ammonia

Chemical Physics Reviews, Journal Year: 2025, Volume and Issue: 6(1)

Published: Feb. 26, 2025

The electrocatalytic nitrate (NO3−) reduction reaction (NO3RR) is an attractive strategy for sustainable ammonia (NH3) synthesis, contributing to the artificial nitrogen cycle and renewable energy storage. However, selective conversion of NO3− NH3 remains challenging due complex multi-electron transfer processes, which result in numerous by-products, low yield rate, Faradaic efficiency. Additionally, electrochemical sensitivity catalyst structure complicates identifying active sites. Herein, we introduce mechanisms situ characterization technologies NO3RR production. Then, a summary theoretical research advances guide design catalyst, including density functional theory calculations, activity descriptors, machine learning. Furthermore, discuss strategies optimize performance NO3RR, focusing on nitrogenous-intermediate adsorption, proton tandem catalysis. Finally, challenges opportunities highly efficient are summarized.

Language: Английский

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Photoelectrocatalytic Transformations of Waste into Value

Artificial photosynthesis., Journal Year: 2025, Volume and Issue: unknown

Published: May 7, 2025

Language: Английский

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Electron Traction Effect of CuPt-Sensitized Photocathode for Enhanced Ammonia Synthesis and Efficient Zn-Nitrate Battery

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 111133 - 111133

Published: May 1, 2025

Language: Английский

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Hollow FeCo2O4@CuCo2O4 Z-Scheme Heterostructure Self-tandem Photoelectro-reduction of Nitrate to Ammonia on Cu−O−Fe Atomic Bridge and Energy Supply in a Zn-nitrate Cell System

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: unknown, P. 124899 - 124899

Published: Dec. 1, 2024

Language: Английский

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Measurement of interfacial charge transfer rate during visible light CO2 reduction under bias voltage conditions

Chemical Physics Letters, Journal Year: 2024, Volume and Issue: 846, P. 141330 - 141330

Published: May 13, 2024

Language: Английский

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Progress on Si‐based photoelectrodes for industrial production of green hydrogen by solar‐driven water splitting

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

Published: Oct. 29, 2024

Abstract Solar power has been regarded as the ultimate green‐energy source because of its inexhaustibility and eco‐friendliness. The solar‐driven water‐splitting technology for green hydrogen production is considered to be one effective ways solar energy harvesting storage, which may provide solutions crisis environmental issues. In past decades, great progress achieved in this area. Photoelectrochemical (PEC) water splitting especially promising fuels expected large‐scale industrial application. Silicon (Si), an ideal candidate photoelectrode, most suitable material PEC device photocatalytic abundance, mature fabrication technology, band gap. Here, we give a systematic review on recent Si‐based photoelectrodes with focus Particularly, strategies, such band‐alignment control, morphology design, surface engineering, are summarized enhance performance durability practical Furthermore, perspective design commercial devices high performance, long‐term stability, large‐size, low cost given at end, shall guide development

Language: Английский

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