Related Experiment Video
Updated: Jul 29, 2025
08:40
Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
3.6K
Mn3O4/CuO heterostructure for nitrate electroreduction to ammonia.
1State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry, Tiangong University, Tianjin 300387, China. liudan@tiangong.edu.cn.
Chemical Communications (Cambridge, England)
|May 24, 2023
Summary
A novel manganese oxide/copper oxide heterostructure on copper foil efficiently converts nitrate to ammonia, achieving high selectivity and Faraday efficiency for this crucial chemical transformation.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Nitrate reduction to ammonia is an important process for fertilizer production and environmental remediation.
- Developing efficient and selective electrocatalysts for nitrate reduction remains a significant challenge.
Purpose of the Study:
- To design and investigate a Mn3O4/CuO heterostructure supported on copper foil (CF) as an electrocatalyst for nitrate reduction to ammonia.
- To understand the structure-activity relationship governing the enhanced catalytic performance.
Main Methods:
- Electrochemical synthesis of Mn3O4/CuO heterostructure on copper foil.
- Electrocatalytic performance evaluation for nitrate reduction.
- Material characterization using techniques like X-ray diffraction, electron microscopy, and X-ray photoelectron spectroscopy.
Main Results:
- The Mn3O4/CuO/CF heterostructure exhibited high selectivity (96.79%) and Faraday efficiency (86.55%) for ammonia production.
- Characterization revealed enhanced charge transfer, electron-deficient Mn sites, electron-rich Cu sites, and abundant oxygen vacancies.
- These features collectively contribute to the superior electrocatalytic activity.
Conclusions:
- The Mn3O4/CuO/CF heterostructure demonstrates significant potential as an efficient electrocatalyst for ammonia synthesis via nitrate reduction.
- This work provides a promising strategy for designing advanced heterostructure electrocatalysts for nitrogen conversion.
More Related Videos
Related Concept Videos
01:29Preparation of Amines: Reduction of Oximes and Nitro Compounds
3.8K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
3.8K
01:261° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
3.3K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.3K
01:371° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
3.9K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
3.9K
01:22Inorganic Nitrogen Assimilation
49
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
49
01:19Structure of Amines
2.6K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.6K
01:15Metabolism of Chemolithotrophs
55
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
55