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Tunable Hollow Pt@Ru Dodecahedra via Galvanic Replacement for Efficient Methanol Oxidation
Xiaoxiao Bai1, Jiarun Geng1, Shuo Zhao1
1Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin 300071, P. R. China.
We developed hollow platinum-ruthenium (Pt-Ru) dodecahedra for enhanced methanol oxidation in fuel cells. These novel nanostructures show superior catalytic activity and stability compared to commercial catalysts.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Platinum-ruthenium (Pt-Ru) nanocrystals are key electrocatalysts for methanol oxidation reactions (MOR) in fuel cells.
- Challenges exist in synthesizing shape-controlled Pt-Ru nanocrystals due to lattice mismatch and ruthenium's high reduction potential.
Purpose of the Study:
- To develop a facile synthesis method for tunable hollow Pt-Ru dodecahedra.
- To investigate the electrocatalytic performance of these novel nanostructures for methanol oxidation.
Main Methods:
- Galvanic replacement method was employed to synthesize Pt-Ru nanocrystals.
- Precursor concentration was controlled to tune the morphology, yielding hollow Pt@Ru dodecahedra (h-Pt@Ru) and deformed hollow Pt@Ru dodecahedra (d-Pt@Ru).
Main Results:
- The optimal d-Pt@Ru dodecahedra exhibited significantly enhanced mass (0.80 A mgPt-1) and specific (1.61 mA cmPt-2) activities for MOR, outperforming commercial Pt/C by 5.25 and 7.78 times, respectively.
- Both h-Pt@Ru and d-Pt@Ru structures demonstrated lower oxidation potentials and improved CO-poisoning resistance compared to PtRu nanoparticles and commercial Pt/C.
- The enhanced performance is attributed to the unique hollow dodecahedron structure, optimal elemental distribution, high Pt utilization at edges/corners, and abundant Pt-Ru interfaces.
Conclusions:
- The galvanic replacement strategy provides a facile route for engineering bimetallic catalysts, overcoming lattice mismatch challenges.
- Tunable hollow Pt@Ru dodecahedra represent a promising class of electrocatalysts for efficient and stable methanol oxidation in fuel cells.
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