The interface-mediated electron structure tuning of RuOx–Co3O4 nano-particles for efficient electrocatalytic nitrate reduction

Liu, Yang; Jiang, Xiaoli; Zhang, Yagang; Li, Hangqi; Huang, Weidong; Yang, Yuanteng; Ye, Minghao; Liu, Yanxia

doi:10.1039/d3dt03318j

Cited by 3 publications

(1 citation statement)

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“…Noble metals (Pt, Pd, Rh, Ru) as catalyst-electrodes have been mainly investigated to establish the mechanism [7], since they show weak adsorption and low rate of nitrate reduction and significant contribution of HER. In terms of efficiency and cost, Cu-and Co-based catalysts are of interest [19,21].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Efficiency of Nitrate Reduction to Ammonia by Fe and Co Nanoparticles Based Bimetallic Electrocatalyst

Kuznetsova,

Lebedeva,

Kultin

et al. 2024

Preprint

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Green and sustainable electrocatalytic conversion of nitrogen-containing compounds to ammonia are currently in high demand in order to replace the eco-unfriendly Haber-Bosch process. Model catalysts for the nitrate reduction reaction were obtained by electrodeposition of metal Co, Fe and bimetallic Fe/Co nanoparticles from aqueous solutions onto a graphite substrate. The samples were characterized by the following methods: SEM, XRD, XPS, UV-vis spectroscopy, cyclic (and linear) voltammetry, chronoamperometry and electrochemical impedance spectroscopy. Besides, the determination of electrochemically active surface was also performed for all electrocatalysts. The best electrocatalyst was a sample containing Fe-nanoparticles on the layer of Co-nanoparticles, which showed the Faradaic efficiency 58.2% (E=-0.785 V vs. RHE) at the ammonia yield rate of 14.6 μmol h-1 cm-2. An opinion was expressed on elucidation of the mechanism of coordinated electrocatalytic action of a bimetallic electrocatalyst. This work can serve primarily as a starting point for future investigations on electrocatalytic conversion reactions to ammonia using model catalysts of the proposed type.

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Section: Introductionmentioning

confidence: 99%

Enhancing Efficiency of Nitrate Reduction to Ammonia by Fe and Co Nanoparticles Based Bimetallic Electrocatalyst

Kuznetsova,

Lebedeva,

Kultin

et al. 2024

Preprint

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Ru‐Induced Defect Engineering in Co₃O₄ Lattice for High Performance Electrochemical Reduction of Nitrate to Ammonium

Lim,

Ma,

O'Connell

et al. 2024

Small

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Amidst these growing sustainability concerns, producing NH4+ via electrochemical NO3− reduction reaction (NO3RR) emerges as a promising alternative to the conventional Haber‐Bosch process. In a pioneering approach, this study introduces Ru incorporation into Co3O4 lattices at the nanoscale and further couples it with electroreduction conditioning (ERC) treatment as a strategy to enhance metal oxide reducibility and induce oxygen vacancies, advancing NH4+ production from NO3RR. Here, supported by a suite of ex situ and in situ characterization measurements, the findings reveal that Ru enrichment promotes Co species reduction and oxygen vacancy formation. Further, as evidenced by the theoretical calculations, Ru integration lowers the energy barrier for oxygen vacancy formation, thereby facilitating a more energy‐efficient NO3RR‐to‐NH4+ pathway. Optimal catalytic activity is realized with a Ru loading of 10 at.% (named 10Ru/Co3O4), achieving a high NH4+ production rate (98 nmol s−1 cm−2), selectivity (97.5%) and current density (≈100 mA cm−2) at −1.0 V vs RHE. The findings not only provide insights into defect engineering via the incorporation of secondary sites but also lay the groundwork for innovative catalyst design aimed at improving NH4+ yield from NO3RR. This research contributes to the ongoing efforts to develop sustainable electrochemical processes for nitrogen cycle management.

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Enhancing Efficiency of Nitrate Reduction to Ammonia by Fe and Co Nanoparticle-Based Bimetallic Electrocatalyst

Kuznetsova,

Lebedeva,

Kultin

et al. 2024

IJMS

View full text Add to dashboard Cite

The green and sustainable electrocatalytic conversion of nitrogen-containing compounds to ammonia is currently in high demand in order to replace the eco-unfriendly Haber–Bosch process. Model catalysts for the nitrate reduction reaction were obtained by electrodeposition of metal Co, Fe, and bimetallic Fe/Co nanoparticles from aqueous solutions onto a graphite substrate. The samples were characterized by the following methods: SEM, XRD, XPS, UV–vis spectroscopy, cyclic (and linear) voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. In addition, the determination of the electrochemically active surface was also performed for all electrocatalysts. The best electrocatalyst was a sample containing Fe-nanoparticles on the layer of Co-nanoparticles, which showed a Faradaic efficiency of 58.2% (E = −0.785 V vs. RHE) at an ammonia yield rate of 14.6 μmol h−1 cm−2 (at ambient condition). An opinion was expressed to elucidate the mechanism of coordinated electrocatalytic action of a bimetallic electrocatalyst. This work can serve primarily as a starting point for future investigations on electrocatalytic conversion reactions to ammonia using model catalysts of the proposed type.

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The interface-mediated electron structure tuning of RuO_x–Co₃O₄ nano-particles for efficient electrocatalytic nitrate reduction

Abstract: The energy-intensive production process of industrial ammonia urges the new methods to be proposed to support the appeal for reducing the global energy consumption. Specifically, the electrocatalytic nitrate reduction reaction...

Cited by 3 publications

References 58 publications

Enhancing Efficiency of Nitrate Reduction to Ammonia by Fe and Co Nanoparticles Based Bimetallic Electrocatalyst

Enhancing Efficiency of Nitrate Reduction to Ammonia by Fe and Co Nanoparticles Based Bimetallic Electrocatalyst

Ru‐Induced Defect Engineering in Co₃O₄ Lattice for High Performance Electrochemical Reduction of Nitrate to Ammonium

Enhancing Efficiency of Nitrate Reduction to Ammonia by Fe and Co Nanoparticle-Based Bimetallic Electrocatalyst

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The interface-mediated electron structure tuning of RuOx–Co3O4 nano-particles for efficient electrocatalytic nitrate reduction

Abstract: The energy-intensive production process of industrial ammonia urges the new methods to be proposed to support the appeal for reducing the global energy consumption. Specifically, the electrocatalytic nitrate reduction reaction...

Cited by 3 publications

References 58 publications

Enhancing Efficiency of Nitrate Reduction to Ammonia by Fe and Co Nanoparticles Based Bimetallic Electrocatalyst

Enhancing Efficiency of Nitrate Reduction to Ammonia by Fe and Co Nanoparticles Based Bimetallic Electrocatalyst

Ru‐Induced Defect Engineering in Co3O4 Lattice for High Performance Electrochemical Reduction of Nitrate to Ammonium

Enhancing Efficiency of Nitrate Reduction to Ammonia by Fe and Co Nanoparticle-Based Bimetallic Electrocatalyst

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The interface-mediated electron structure tuning of RuO_x–Co₃O₄ nano-particles for efficient electrocatalytic nitrate reduction

Ru‐Induced Defect Engineering in Co₃O₄ Lattice for High Performance Electrochemical Reduction of Nitrate to Ammonium