Related Experiment Video
Updated: Aug 6, 2026
10:57
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Molecular-Level Modulation of Mass Transfer Kinetics in Trinuclear Copper Cluster-Based COFs Enables Efficient
Guinan Chen1,2, Chao Zhu1,2, Yu Zhou2
1School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, China.
Angewandte Chemie (International Ed. in English)
|August 5, 2026
Summary
This study introduces novel copper-based covalent organic frameworks for electrocatalytic nitrate reduction, optimizing ammonia synthesis and reducing pollution. The best-performing catalyst, CuDA-TMB, significantly enhances reaction efficiency by controlling mass transfer kinetics.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Electrocatalytic nitrate reduction (NO3RR) is crucial for sustainable ammonia synthesis and environmental remediation.
- Catalyst design often neglects mass transfer kinetics, limiting NO3RR performance.
Purpose of the Study:
- To develop and investigate novel covalent organic frameworks (COFs) based on trinuclear copper clusters for electrocatalytic NO3RR.
- To understand how catalyst structure, steric hindrance, and pore architecture influence mass transfer and catalytic activity.
Main Methods:
- Synthesis of vinylene-linked trinuclear copper cluster-based COFs (CuDB-TMT, CuDA-TMT, CuDA-TMB) via Knoevenagel condensation.
- Systematic structural variation and characterization of COFs.
- Electrochemical evaluation of NO3RR performance, including Faradaic efficiency and yield rate.
- Computational studies to elucidate reaction mechanisms and kinetics.
Main Results:
- CuDA-TMB, with enlarged pores and unobstructed active sites, achieved 95.36% ammonia Faradaic efficiency and a yield rate of 10.26 mg h-1 cm-2.
- Steric hindrance in CuDB-TMT suppressed activity due to mass transfer limitations.
- Mass transfer regulation was identified as a critical factor for high catalytic performance.
- CuDA-TMB demonstrated efficacy as a cathode in Zn-nitrate batteries.
Conclusions:
- Molecular-level control over mass transfer kinetics is essential for designing high-performance porous electrocatalysts for NO3RR.
- The developed COFs offer a tunable platform for optimizing electrocatalytic processes.
- This research provides insights into catalyst design strategies for efficient ammonia synthesis and pollution mitigation.
Related Concept Videos
01:43Electron Transport Chain: Complex III and IV
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
01:30Processes at Electrodes
The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
00:56Extraction: Advanced Methods
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...