Regulating the Electrochemical Nitrate Reduction Performance with Controllable Distribution of Unconventional Phase Copper on Alloy Nanostructures

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 6, 2024

Abstract Electrochemical nitrate reduction reaction (NO 3 RR) is emerging as a promising strategy for removal and ammonia (NH ) production using renewable electricity. Although great progresses have been achieved, the crystal phase effect of electrocatalysts on NO RR remains rarely explored. Here, epitaxial growth unconventional 2H Cu hexagonal close‐packed ( hcp IrNi template, resulting in formation three IrNiCu@Cu nanostructures, reported. IrNiCu@Cu‐20 shows superior catalytic performance, with NH Faradaic efficiency (FE) 86% at −0.1 (vs reversible hydrogen electrode [RHE]) yield rate 687.3 mmol g −1 h , far better than common face‐centered cubic Cu. In sharp contrast, IrNiCu@Cu‐30 IrNiCu@Cu‐50 covered by shell display high selectivity toward nitrite 2 − ), FE above 60% 0.1 RHE). Theoretical calculations demonstrated that has optimal electronic structures due to highest d‐band center strongest trend lowest energy barriers. The electroactivity originates from abundant low coordination sites surface, which guarantees fast electron transfer accelerate intermediate conversions. This work provides feasible tactic regulate product distribution engineering electrocatalysts.

Language: Английский

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Geological ammonia: Stimulated NH3 production from rocks

Joule, Journal Year: 2025, Volume and Issue: unknown, P. 101805 - 101805

Published: Jan. 1, 2025

Language: Английский

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Intermetallic Compound and Solid Solutions of Co75Me25 (Me: Si, Fe, Cr) as Catalysts for the Electrochemical Reaction of Nitrate Conversion to Ammonia

International Journal of Molecular Sciences, Journal Year: 2025, Volume and Issue: 26(4), P. 1650 - 1650

Published: Feb. 14, 2025

A sustainable reaction of electrocatalytic nitrate conversion in ammonia production (NO3RR) occurring under ambient conditions is currently prime interest, as well urgent research due to the real potential replacement environmentally unfavorable Haber-Bosch process. Herein, a series electrocatalysts based on two-component cobalt alloys was synthesized using low-cost non-noble metals Co, Fe, Cr, and also Si. The samples were characterized studied by following methods: SEM, EDX, XRD (both transmission reflection), UV-VIS spectroscopy, optical microscopy, linear (and cyclic) voltammetry, chronoamperometry, electrochemical impedance spectroscopy. Beyond that, determination electrochemically active surface area carried out for all electrocatalysts. Unexpectedly, sample having an intermetallic compound (IMC) composition Co2Si turned be most highly effective. highest Faradaic efficiency (FE) 80.8% at E = -0.585 V (RHE) yield rate 22.3 µmol h-1 cm-2 -0.685 indicate progressive role IMC main component electrocatalyst. Thus, this study demonstrates promise enormous efficient NO3RR. This work can serve primarily starting point future studies reactions catalysts containing metals.

Language: Английский

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Sustainable ammonia synthesis: opportunities for electrocatalytic nitrate reduction

Journal of Energy Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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A bifunctional CoNi alloy for electrocatalytically coupled cathodic nitrate reduction and anodic HPAM oxidation

Journal of Electroanalytical Chemistry, Journal Year: 2025, Volume and Issue: unknown, P. 119105 - 119105

Published: April 1, 2025

Language: Английский

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Sustainable Mining – unlocking resources towards circular economy to meet energy transition through electrochemistry

Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: unknown, P. 116600 - 116600

Published: April 1, 2025

Language: Английский

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Active Hydrogen Enrichment on Cu₆Sn₅‐type High Entropy Intermetallics for Efficient Nitrate Reduction Reaction

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

Published: May 6, 2025

Abstract Electrocatalytic nitrate reduction reaction (NO 3 RR) provides a feasible strategy for green ammonia production and the treatment of pollution in wastewater. The generation active hydrogen (H*) plays an important role improving selectivity, yield rate, Faradaic efficiency products. Here, structurally ordered nanoporous Cu 6 Sn 5 ‐type high entropy intermetallics (HEI) with extremely superior performance toward NO RR is demonstrated. optimal (Cu 0.25 Ni Fe Co ) HEI delivers NH 97.09 ± 1.15% excellent stability 120 h at industrial level current density 1 A cm −2 , accordingly directly converting ‒ to high‐purity (NH 4 2 HPO near‐unity efficiency. Theoretical calculations combined experimental results reveal that multi‐site nature can simultaneously promote water dissociation, reduce reaction‐free energy hydrogenation process, suppress evolution. This work design precious‐metal‐free sustainable synthesis paves insights into H* enrichment mechanism.

Language: Английский

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Electron-deficient asymmetric Co centers marry oxygen vacancy for NO3RR: Excellent activity and anion resistance property

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 503, P. 158536 - 158536

Published: Dec. 11, 2024

Language: Английский

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Interface Engineering of Network‐Like 1D/2D (NHCNT/Ni─MOF) Hybrid Nanoarchitecture for Electrocatalytic Water Splitting

Small Methods, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 17, 2024

Here, integrated functional components into a hybrid heterostructure via highly stabilized network-like interconnected electronic nanoarchitecture of 1D N-doped holey-carbon nanotube (NHCNT) with 2D nickel─metal-organic framework (Ni─MOF) nanosheets are developed as high-performance electrocatalyst for overall water splitting. The NHCNT promoting electron transport pathways in electrocatalyst, and formation holes nanotubes further enables excellent diffusion ions the reaction rate. An combination 1D/2D structure NHCNT/Ni─MOF-4 exhibits oxygen evolution (η

Language: Английский

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Flexible Electrochemical Stripping for Wastewater Ammonia Recovery with On-Demand Product Tunability

Environmental Science & Technology Letters, Journal Year: 2024, Volume and Issue: 11(8), P. 886 - 894

Published: July 5, 2024

Nitrogen in wastewater can be recovered to prevent negative environmental, human health, and economic impacts enable distributed chemical manufacturing. We developed novel flexible electrochemical stripping (FECS) for tunable recovery of ammonia/ammonium (total ammonia nitrogen, TAN) from urine as (NH4)2SO4 aqueous NH3. Batch continuous experiments demonstrated that product speciation could readily controlled by modifying cell operation frequency, duration, applied current without affecting TAN removal. During experiments, FECS NH3 solutions with concentrations similar ready-to-use cleaners (1% 2% (w/w) or 8.22 16.4 g/L cleaner concentrates (5% 41.1 TAN), well between 5 18.4 TAN, approaching commercial fertilizer (28.4 TAN). Beyond current, future process engineering operating condition optimization should reduce energy consumption, increase efficiency, enhance viability FECS. Our findings will the development deployment nitrogen contexts varying needs ammonia-based products, paving way circular economies integrate manufacturing sanitation systems.

Language: Английский

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