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Reduction-Driven 3D to 2D Transformation of Cu Nanoparticles
Lívia P Matte1, Alisson S Thill1, Francielli O Lobato2
1Programa de Pós-Graduação em Física, Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS 91501-970, Brazil.
Small (Weinheim an Der Bergstrasse, Germany)
|January 12, 2022
Summary
Copper nanoparticles change shape on cerium oxide surfaces during reduction, enhancing their catalytic activity for carbon monoxide oxidation. This shape transformation improves the metal-oxide interaction, crucial for catalyst performance.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Nanoscale metal-metal oxide interactions are critical in catalysis.
- Nanoparticle shape influences catalytic performance, often assumed stable during reactions.
Purpose of the Study:
- To synthesize highly reducible cerium oxide (CeO2-x) nanoparticles.
- To create copper (Cu)/CeO2-x nanoparticles for CO oxidation.
- To investigate the effect of nanoparticle shape change on Cu-CeO2-x interaction and reactivity.
Main Methods:
- Synthesis of reducible CeO2-x nanoparticles.
- Formation of Cu/CeO2-x catalysts.
- Characterization of nanoparticle shape transformation during reduction treatment.
- Analysis of CO oxidation reaction performance.
Main Results:
- Cu nanoparticles transformed from 3D spherical to 2D planar shapes during reduction.
- This shape change enhanced the interaction between Cu and CeO2-x.
- Oxygen atom migration from CeO2 surface to Cu nanoparticle borders and Cu0 to Cu+1 state change were observed.
- The nanoparticle spreading altered the local atomic order around Cu, influencing CO oxidation reactivity.
Conclusions:
- Nanoparticle shape evolution during reduction is a key factor in enhancing metal-metal oxide interactions.
- The observed Cu nanoparticle spreading on CeO2-x significantly impacts catalytic activity for CO oxidation.
- This study provides insights into optimizing catalyst design through controlled shape changes.
