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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
Electrodeposited noble metal particles in polyelectrolyte multilayer matrix as electrocatalyst for oxygen reduction
Yan Shen1, Markus Träuble, Gunther Wittstock
1Carl von Ossietzky University Oldenburg, Faculty of Mathematics and Natural Sciences, Institute of Chemistry and Biology of the Marine Environment (ICBM), D-26111, Oldenburg, Germany.
Physical Chemistry Chemical Physics : PCCP
|June 20, 2008
Summary
Noble metal particles of palladium (Pd) and platinum (Pt) were fabricated within polyelectrolyte films for oxygen reduction electrocatalysis. Their catalytic activity and intermediate hydrogen peroxide detection were successfully demonstrated.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Layer-by-layer (LbL) deposition offers stable and penetrable polyelectrolyte films.
- Noble metal nanoparticles are crucial for electrocatalytic applications, particularly oxygen reduction.
- Galvanic deposition is a method for fabricating metal nanoparticles within polymer matrices.
Purpose of the Study:
- To fabricate palladium (Pd) and platinum (Pt) nanoparticles within polyelectrolyte multilayer films using galvanic deposition.
- To investigate the electrocatalytic properties of these noble metal particle films for oxygen reduction.
- To characterize the morphology and analyze the reaction pathways of the electrocatalytic process.
Main Methods:
- Layer-by-layer (LbL) deposition for polyelectrolyte film formation.
- Galvanic deposition for incorporating Pd and Pt nanoparticles.
- Atomic Force Microscopy (AFM) for morphological characterization.
- Cyclic Voltammetry (CV) and Scanning Electrochemical Microscopy (SECM) for electrocatalytic evaluation.
- Substrate-generation/tip-collection mode in SECM for intermediate detection.
- Analytical modeling for fitting current transients and determining reduction pathways.
Main Results:
- Pd and Pt nanoparticles were successfully fabricated within preformed polyelectrolyte multilayer films.
- The electrocatalytic performance of Pd particle films for oxygen reduction was tunable by electrodeposition time.
- SECM enabled the detection of hydrogen peroxide as an intermediate in dioxygen electroreduction.
- Analysis of current transients provided insights into the relevance of different reduction pathways.
Conclusions:
- Polyelectrolyte films are effective matrices for fabricating noble metal nanoparticle electrocatalysts.
- The electrocatalytic activity of Pd nanoparticles can be controlled by adjusting fabrication parameters.
- SECM is a valuable tool for studying electrocatalytic mechanisms and intermediate species.
- This approach offers a pathway for developing advanced electrocatalysts for oxygen reduction reactions.
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