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Effect of halide-modified model carbon supports on catalyst stability
Kevin N Wood1, Svitlana Pylypenko, Tim S Olson
1Department of Metallurgical & Materials Engineering, Colorado School of Mines, 1500 Illinois Street, Golden, Colorado 80401, USA.
Functionalizing carbon supports with nitrogen and fluorine enhances platinum-ruthenium catalyst stability by preventing nanoparticle growth. This targeted modification improves catalyst performance and durability for electrochemical applications.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Carbon-based materials are crucial catalyst supports.
- Functionalization enhances material properties and performance.
- PtRu catalysts are vital for electrochemical reactions.
Purpose of the Study:
- To investigate the impact of nitrogen, iodine, and fluorine doping on highly-oriented pyrolytic graphite (HOPG) carbon supports.
- To evaluate the effect of these dopants on the stability of platinum-ruthenium (PtRu) catalyst nanoparticles.
- To determine the optimal functionalization strategy for improved catalyst durability.
Main Methods:
- Ion implantation of nitrogen, iodine, and fluorine into HOPG.
- Characterization of functionalized carbon supports.
- Evaluation of PtRu catalyst nanoparticle coverage, size, and stability on modified supports.
Main Results:
- Nitrogen and fluorine co-functionalization significantly suppressed PtRu nanoparticle coarsening and dissolution.
- This combined doping strategy offered superior benefits compared to nitrogen-only modification.
- Iodine implantation caused structural damage and provided stability benefits only at high doses, suggesting a different mechanism.
Conclusions:
- Targeted functionalization of carbon supports with nitrogen and fluorine is a highly effective strategy for enhancing PtRu catalyst stability.
- The synergistic effect of nitrogen and fluorine provides superior protection against nanoparticle degradation.
- Further research is needed to elucidate the distinct durability mechanisms of iodine-modified carbon supports.
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