Emerging MXene-based electrocatalysts for efficient nitrate reduction to ammonia: recent advance, challenges, and prospects

Energy Materials, Journal Year: 2024, Volume and Issue: 4(5)

Published: June 4, 2024

Ammonia (NH3) plays an irreplaceable role in traditional agriculture and emerging renewable energy. Its preparation industry mainly relies on the energy-intensive Haber-Bosch process, which is associated with high energy consumption large CO2 emissions. Recently, nitrate reduction reaction (NO3-RR) driven by has received extensive attention. This can efficiently synthesize NH3 water as a hydrogen source NO3- nitrogen under mild conditions, conducive to reducing promoting carbon cycle. It well known that properties of electrocatalysts determine performance NO3-RR. As two-dimensional material, MXenes (transition metal carbides/nitrides/carbon nitrides) possess excellent electrical conductivity, specific surface area controllable functional groups, shows great application potential field Herein, this review summarized structure, synthesis strategies elucidate possibilities from foundation application. Then, latest research progress applying MXene-based NO3-RR was applicability different detection methods analyzed. Finally, present challenges future prospects were presented. aimed provide thoughtful insights into rational design for sustainable synthesis.

Language: Английский

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Lignin-Derived Ordered Mesoporous Carbon-Supported Bimetallic Cu–Co Nanoparticles for Enrichment and Electroreduction of Nitrate to Ammonia

ACS Sustainable Chemistry & Engineering, Journal Year: 2023, Volume and Issue: 11(44), P. 15865 - 15875

Published: Oct. 25, 2023

Owing to the electrocatalytic performance in nitrate reduction reaction (NO3RR), bimetallic catalysts are emerging reliable candidates for noble metal electrocatalysts realize treatment and conversion of wastewater into valuable ammonia. The can further be economized fabrication enhanced by using inexpensive biomass-derived mesoporous carbon as supports. Herein, lignin-derived ordered (OMC)-supporting CuCo nanoparticles (Cu5Co5/OMC) were prepared enable with an ammonia yield rate 21.05 mg h–1 cm–2, Faradaic efficiency (FENH3) 96.9% at −0.6 V vs reversible hydrogen electrode (RHE), a stable FENH3 above 85% within wide potential window (−0.2 −0.8 RHE). An appropriate proportion copper/cobalt is beneficial adsorption activation progressive hydrogenation through electron redistribution. OMC supports uniform dispersion active sites good enrichment reactants. And density functional theory (DFT) theoretical calculations prove strong metal–support interaction between NPs boosting outstanding Cu5Co5/OMC NO3RR. pathway was revealed combination electrochemical situ Fourier transform infrared Raman spectra.

Language: Английский

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A Perspective on Cu‐Based Electrocatalysts for Nitrate Reduction for Ammonia Synthesis

Advanced Energy and Sustainability Research, Journal Year: 2023, Volume and Issue: 5(1)

Published: Nov. 14, 2023

Compared to the Haber–Bosch (H–B) process for ammonia synthesis with massive emission of greenhouse CO 2 and necessary harsh reaction conditions, electrocatalytic NO 3 − reduction (NO RR) under ambient temperature pressure driven by renewable electricity has attracted great attention. RR is also a promising route construct nitrogen cycles utilizing x produced from industrial agricultural operations. Cu‐based catalyst one most platforms this reaction. This perspective shows latest understanding research advances on electrocatalysts. Through deep analysis rate‐limiting step RR, strategies overcoming deactivation enhancing performance catalysts are discussed. The significance synergistic H activation in promoting key kinetic single‐atom, oxide, bimetallic Cu catalytic site construction tunable adsorption N‐containing intermediate active stressed. Also, future challenges perspectives toward coupling nitrate catalyzed proposed. can move forward over advanced

Language: Английский

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Synergistic Effect of Ni/Ni(OH)₂ Core‐Shell Catalyst Boosts Tandem Nitrate Reduction for Ampere‐Level Ammonia Production

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(27)

Published: April 23, 2024

Abstract Electrocatalytic reduction of nitrate to ammonia provides a green alternate the Haber–Bosch method, yet it suffers from sluggish kinetics and low yield rate. The follows tandem reaction nitrite subsequent hydrogenation generate ammonia, Faraday efficiency (FE) is limited by competitive hydrogen evolution reaction. Herein, we design heterostructure catalyst remedy above issues, which consists Ni nanosphere core Ni(OH) 2 nanosheet shell (Ni/Ni(OH) ). In situ Raman spectroscopy reveals are interconvertible according applied potential, facilitating cascade synergistically. Consequently, attains superior electrocatalytic performance with an FE 98.50 % current density 0.934 A cm −2 at −0.476 V versus reversible electrode, exhibits average rate 84.74 mg h −1 during 102‐hour stability test, highly reported catalysts tested under similar conditions. Density functional theory calculations corroborate synergistic effect in reduction. Moreover, Ni/Ni(OH) also possesses good capability for methanol oxidation thus used establish system coupling

Language: Английский

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Oxygen-deficient NiCo2O4 porous nanowire for superior electrosynthesis of ammonia coupling with valorization of ethylene glycol

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 496, P. 154220 - 154220

Published: July 22, 2024

Language: Английский

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