Self-Optimized Ligand Effect of Single-Atom Modifier in Ternary Pt-Based Alloy for Efficient Hydrogen Oxidation
Beibei Pang1,2, Chuanyi Jia3, Sicong Wang1
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, P.R. China.
Nano Letters
|April 28, 2023
Summary
Single-atom copper in platinum alloys enhances hydrogen oxidation reaction performance by modulating electronic structure. This creates superior CO tolerance, crucial for fuel cell applications.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Enhancing activity and CO tolerance of platinum-based alloys is critical for the hydrogen oxidation reaction (HOR).
- The precise role of foreign modifier metals and their ligand effects in these alloys remains incompletely understood.
Purpose of the Study:
- To investigate how single-atom copper (Cu) dynamically modulates the electronic structure (d-band center) of platinum (Pt)-based alloys.
- To elucidate the ligand effect's contribution to boosting HOR performance and CO tolerance.
Main Methods:
- In situ X-ray absorption spectroscopy (XAS) was employed to study structural and electronic changes.
- Electrochemical performance testing was conducted to evaluate HOR activity and CO tolerance.
Main Results:
- Potential-driven structural rearrangement in Pt-Cu-Pd alloys into high-coordination Cu-Pt/Pd structures was observed.
- This rearrangement intensified the ligand effect, leading to enhanced HOR performance.
- Modulated d-band structure resulted in near-optimal binding energies for hydrogen/hydroxyl species and reduced CO adsorption.
- PtPdCu1/C catalyst demonstrated excellent CO tolerance at 1,000 ppm impurity levels.
Conclusions:
- Single-atom Cu acts as a dynamic modulator of the Pt-based alloy's electronic structure via the ligand effect.
- Optimized electronic properties significantly boost HOR kinetics and CO tolerance.
- The developed PtPdCu1/C catalyst shows great promise for applications requiring high CO tolerance.
Keywords:
Pt-based alloyhydrogen oxidation reactionin situ synchrotron X-ray absorption spectroscopyligand effectMore Related Videos
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