Amorphous CuCoO_x Boosts Active Hydrogen for High‐Rate Tandem Electroreduction of Nitrate to Ammonia

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 26, 2025

The electroreductive conversion of waste nitrate (NO₃⁻) to high-value ammonia (NH₃) offers an alternative the energy-intensive Haber-Bosch process. However, this reaction involves multistep electron-coupled proton transfer, posing kinetic challenges for NH₃ generation. Herein, a-CuCoOx-based tandem electrocatalyst nitrate-to-ammonia is presented. In 1 M KOH with 50 mM NO₃⁻, amorphous catalyst achieves a Faradaic efficiency (FE) 95.61% and yield rate 4.01 mg h⁻¹ cm⁻2 at -0.3 V versus RHE, outperforming its crystalline counterpart (FE: 80.21%; rate: 0.91 cm⁻2). Integrated into Zn-NO₃⁻ battery, a-CuCoOx exhibits peak power density 7.21 mW robust stability. Systematic electrochemical analyses revealed that structure Cu-Co synergy enhance active hydrogen (H*) generation accelerate nitrite-to-ammonia conversion. This study provides insights designing advanced electrocatalysts sustainable energy catalysis.

Language: Английский

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Enabling High Performance in a Positive Potential of Nitrate‐to‐Ammonia Electrocatalysis Over Mesoporous Core@Shell Cu₂O/Cu@PdCu Nanozyme

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

Published: April 2, 2025

Electrocatalytic tandem nitrate reduction to ammonia (NO3 --to-NH3) offers a promising pathway for energy and environmental sustainability. Although considerable efforts have been presented modulate the reaction pathways enhanced NO3 --to-NH3 electrocatalysis, these advances often require relatively high overpotentials balance yield rate selectivity of NH3, resulting in remarkable inefficiency. Inspired by enzyme catalysis nature, herein enzyme-like electrocatalyst is designed consisting core Cu2O/Cu heterojunction surrounded mesoporous PdCu shell (Cu2O/Cu@mesoPdCu) that accelerated electrocatalysis positive potentials. Impressively, Cu2O/Cu@mesoPdCu nanozymes hold superior performance robust NH3 electrosynthesis fairly potential 0.10 V (versus reversible hydrogen electrode), having Faraday efficiency 96.2%, 13.3 mg h-1 mg-1, half-cell 46.0%. Kinetic studies, situ spectra density functional theory calculations revealed preferentially adsorbed - further reduced *NO2, while active radicals enriched on promoted multistep hydrodeoxygenation *NO2 within "semi-closed" microenvironment, both which synergistically enabled Moreover, this disclosed better more energy-efficient manner when coupling with thermodynamically favorable ethanol oxidation reaction.

Language: Английский

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Palladium Married with MBene Multilayers: Enabling Intensified Hydrogen Spillover for Efficient Nitrite‐to‐Ammonia Electroreduction

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

Published: April 8, 2025

Abstract Electrochemical nitrite reduction reaction (NO 2 RR) has emerged as a promising alternative approach for ammonia (NH 3 ) production, offering both energy efficiency and environmental sustainability. The rational regulation of active hydrogen (*H) is pivotal NO − ‐to‐NH conversion, yet it remains significant challenge in the context RR. In this study, molybdenum boride (MBene) multilayers are introduced an electronic support to integrate with palladium (Pd) nanoparticles, creating dual catalytic sites that effectively balance adsorption *H *NO , thereby enabling synergistic catalysis Theoretical experimental analyses revealed efficiently generated on Pd subsequently undergoes spillover ‐adsorbed MBene surfaces, facilitating accelerated hydrogenation NH synthesis. Consequently, Pd/MBene catalyst demonstrated exceptional performance, achieving high Faradaic 89%, yield rate 16.9 mg h −1 cat remarkable cycling stability at low applied potential ‐0.3 V versus RHE. Motivated by outstanding RR further utilized cathode construct Zn‐nitrite formaldehyde‐nitrite batteries. These systems functionality simultaneous production electricity generation, highlighting versatile efficient sustainable conversion.

Language: Английский

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New strategy for the enhanced electrocatalytic reduction of nitrate: Construction of charge polarization by interfacial engineering

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 693, P. 137673 - 137673

Published: April 22, 2025

Language: Английский

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Hydrogen Spillover Mediated Nitrite Hydrogenation for Ultralow-Potential Ammonia Electrosynthesis over Platinum Nanoparticles Anchored on Cu Hydroxide Nanowires

Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: unknown, P. 125435 - 125435

Published: May 1, 2025

Language: Английский

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