Laser-induced PdCu alloy catalysts for highly efficient and stable electrocatalytic nitrate reduction to ammonia

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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Non-rigid metal–oxygen bonding empowered nitrate reduction on ruthenium catalysts

Nano Energy, Journal Year: 2024, Volume and Issue: 130, P. 110088 - 110088

Published: Aug. 6, 2024

Electrocatalytic nitrate reduction (NitRR) offers exciting potential for mass production of ammonia (NH3) from renewables. However, the rigidity metal−ligand bonds in most electrocatalysts renders them unable to survive structural transformations required NitRR. Herein, we establish a type non-rigid metal−oxygen by employing graphene oxide (GO) sheets as 'micron-scale' ligand transition metals (TM). Because being confined interfaces between GO and TM, oxygenated groups can associate with dissociate TM response reaction dynamics. As proof-of-concept demonstration, an electrocatalyst was developed dispersing nanoscale ruthenium (Ru) on utilizing two-dimensional MXene compensate low electrical conductivity GO. This exhibits maximum NH3 yield over 5 mg cm−2 h−1, almost 100 % current-to-NH3 efficiency, far outperforming performance reported Ru-based materials. What's even more remarkable is achievement record-breaking performance: 200-hour stable electrolysis 40.2 using membrane electrode reactor. Our experimental theoretical investigations further reveal non-rigidity Ru–O how they self-regulate adapt diverse intermediates involved work provides approach fabricate high-performance featuring reversible bonds, opening new possibilities practical electrolysis.

Language: Английский

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Ir NCs Embedded Co-MOF Nanosheets for Boosting Electrochemical Nitrate Reduction to Ammonia Performance

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

In this study, Ir nanoclusters adorned with abundant p-mercaptobenzoic acid (p-MBA) ligands were employed to fabricate an electrocatalytic material consisting of embedded within two-dimensional Co-MOF nanosheets (Ir NCs@Co-MOF) for the NO3- reduction reaction (NO3-RR). TEM analysis confirmed that are uniformly distributed in 2D nanosheets, average diameter about 1.8 nm. At a potential -0.8 V vs RHE, NCs@Co-MOF catalyst achieved nitrate conversion rate, ammonia selectivity, and yield 92.5, 81.4%, 230.1 μg·h-1·cm-2, respectively, over duration 120 min. The strong interaction between serves enhance activity accelerate rate reduction. Stability tests indicated after 20 cycles, both selectivity demonstrated relative stability, thereby indicating robust performance catalytic system. results EPR TBA quenching experiments indicate *H plays key role NO3-RR process. situ DEMS investigations revealed during process, pathway was as follows: *NO3 → *NO2 *NO *NOH *NH2OH *NH2 *NH3 NH3.

Language: Английский

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Waste to treasure: Self-powered electrocatalytic upgrading of nitrite and PET plastic wastes into value-added ammonia and formic acid over core–shell Ru-Co3O4 heterojunctions

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161855 - 161855

Published: March 1, 2025

Language: Английский

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Multiple Functional Engineering Strategies and Active Site Identification in Ru‐Based Electrocatalysts for Catalytic Conversion Reactions

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

Published: April 3, 2025

Electrochemical conversion has been regarded as an ideal technology for achieving clean and sustainable energy, showing significant promise in addressing the increasingly serious energy crisis environmental pollution. Ru-containing electrocatalysts (RUCE) outperform other precious metals due to elevated intrinsic activity superior cost-effectiveness, developing into a promising candidate electrochemical reactions. A challenge field of catalyst discovery lies its heavy reliance on empirical methods, rather than approaches that are rooted rational design principles. This review first concentrates catalytically active sites critical factors governing catalytic performance durability. Then, comprehensive summary multifunctional modification strategies ranging from nanoscale atomic scale is explored control structure improve performance. By unveiling roles each component modified RUCE at level, their identified discussed establish structure-performance relationship catalysts. Finally, challenges perspectives Ru-based materials hydrogen, oxygen, nitrogen reactions presented inspire further efforts toward understanding meet ever-growing demand future.

Language: Английский

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Curvature-Influenced Electrocatalytic NRR Reactivity by Heme-like FeN4-Site on Carbon Materials

Molecules, Journal Year: 2025, Volume and Issue: 30(8), P. 1670 - 1670

Published: April 8, 2025

Two-dimensional carbon materials and their derivatives are widely applied as promising electrocatalysts supports of single-atom sites. Theoretical investigations 2D usually based on planar models, yet ignore local curvature brought by possible surface distortion, which can be significant to the exact catalytic performance has been realized in latest research. In this work, curvature-influenced electrocatalytic nitrogen reduction reaction (NRR) reactivity heme-like FeN4 site was predicted a first-principle study, with FeN4-CNT(m,m) (m = 5~10) models adopted models. The results showed that larger is favored for NRR, lower limiting potential higher N2 adsorption affinity, while smaller shows NH3 desorption energy beneficial catalyst recovery. Using electronic structures logarithm fitting, we also found FeN4-CNT(5,5) an intermediate-spin state, different from high-spin state exhibited other 6~10) curvature.

Language: Английский

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Interfacial Electronic Interactions Induced by Self‐Assembled Amorphous RuCo Bimetallenes/MXene Heterostructures for Nitrate Electroreduction to Ammonia

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

Published: May 12, 2025

Abstract Electrocatalytic nitrate reduction to ammonia (NO 3 RR) is an attractive green route generate valuable and remove nitrates in industrial processes. However, under the intense competition of hydrogen evolution reactions (HER), it a key challenge improve selectivity reduce energy consumption reaction. Herein, unique amorphous RuCo Bimetallenes confined on Ti C 2 T x ‐MXene (RuCo/Ti ) reported as highly efficient NO RR catalyst, showing remarkable Faradaic efficiency for 94.7% at −0.2 V versus reversible electrode (RHE), with corresponding high yield rate 98.8 mg h −1 cat −0.6 RHE. Significantly, RuCo/Ti heterostructures are able operate stably 1 A cm −2 over 100 membrane assembly (MEA) conditions stabilized NH Faraday efficiency. In‐depth theoretical operando spectroscopic investigations unveil that situ generation heterojunction via interfacial Ru/Co─O bridges can induce charge redistribution through Ru/Co─O‐Ti structure modulate electronic Bimetallenes, significantly promoting * H production adsorption activation reactants/intermediates, while suppressing HER, thereby boosting performance. This study offers new insight metal‐support interaction development high‐performance electrocatalysts.

Language: Английский

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High-entropy catalysts for electrocatalytic reduction reaction

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1009, P. 176970 - 176970

Published: Oct. 11, 2024

Language: Английский

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Advanced Ruthenium‐Based Electrocatalysts for NO_x Reduction to Ammonia

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

Published: Dec. 15, 2024

Ammonia (NH

Language: Английский

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Electrodeposition of 3D dendritic Cu-Sn bimetallic alloy for electrocatalytic nitrate reduction to ammonia

New Journal of Chemistry, Journal Year: 2024, Volume and Issue: 48(30), P. 13233 - 13237

Published: Jan. 1, 2024

Cu–Sn alloy attains an NH 3 yield rate and faraday efficiency up to 293.12 μmol h −1 cm −2 78.57% at −1.2 V versus reversible hydrogen electrode in 0.1 M Na 2 SO 4 (containing 0.01 NaNO ) electrolyte.

Language: Английский

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