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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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AgPd nanoparticles for electrocatalytic CO2 reduction: bimetallic composition-dependent ligand and ensemble effects
Meiyang Cui1, Grayson Johnson, Zhiyong Zhang
1Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA. sz3t@virginia.edu.
Nanoscale
|June 26, 2020
Summary
Silver-palladium nanoparticles efficiently catalyze carbon dioxide reduction to carbon monoxide. Optimized Ag15Pd85 composition enhances CO production and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Electrocatalytic CO2 reduction is crucial for sustainable energy.
- Developing efficient and selective catalysts remains a challenge.
- Tuning bimetallic nanoparticle composition offers a promising strategy.
Purpose of the Study:
- To synthesize and investigate monodisperse AgPd nanoparticles for electrocatalytic CO2 reduction.
- To understand the role of Ag incorporation in modulating catalytic activity.
- To identify the optimal AgPd composition for efficient CO production.
Main Methods:
- Synthesis of monodisperse AgPd nanoparticles.
- Density Functional Theory (DFT) calculations for mechanistic insights.
- Environmental diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) for surface analysis.
- Electrochemical performance evaluation.
Main Results:
- Ag incorporation in AgPd NPs weakens CO adsorption via ligand and ensemble effects.
- Ag15Pd85 NPs demonstrated optimal CO2 to CO conversion.
- Achieved unity conversion with high mass activity (15.2 mA mgmetal-1) at -0.8 V vs. RHE.
- Exhibited high stability with minimal Faradaic efficiency loss over 12 hours.
Conclusions:
- Tuning bimetallic composition is key to optimizing CO2 electroreduction.
- AgPd NPs offer a highly efficient and stable catalytic system for CO production.
- Understanding adsorption mechanisms provides pathways for future catalyst design.
