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Published on: October 20, 2023
Twisted Ru Homostructures Enable High-Efficiency Alkaline Hydrogen Oxidation Reaction
Jiahe Yang1, Dingge Fan1, Zhiyu Cheng1
1Hefei National Research Center for Physical Sciences at the Microscale and Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, China.
Developing new catalysts for alkaline hydrogen oxidation reaction (HOR) is key for anion exchange membrane fuel cells (AEMFCs). Twisted ruthenium homostructures show superior performance, surpassing platinum-based catalysts in fuel cell applications.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Platinum (Pt) catalysts are essential for hydrogen oxidation reaction (HOR) in anion exchange membrane fuel cells (AEMFCs).
- Ruthenium (Ru)-based heterostructures show promise as alternatives but face limitations in active sites and intermediate migration.
- Developing efficient, non-Pt catalysts is crucial for AEMFC advancement.
Purpose of the Study:
- To design and synthesize novel Ru-based catalysts for alkaline HOR.
- To overcome the limitations of Ru-based heterostructures by utilizing twisted homostructures.
- To evaluate the catalytic performance and fuel cell application of the new Ru catalyst.
Main Methods:
- Synthesis of twisted Ru homostructures.
- Characterization of catalyst structure and electronic properties.
- Electrochemical testing of alkaline HOR activity and fuel cell performance.
Main Results:
- The twisted Ru homostructures exhibit optimized thermodynamics and enhanced intermediate migration kinetics.
- The catalyst achieved exceptional alkaline HOR activity with a kinetic current density (jk) of 77.2 mA cm-2 at 50 mV.
- In AEMFCs, the catalyst reached a peak power density of 1.81 W cm-2, outperforming commercial PtRu/C and Pt/C catalysts.
Conclusions:
- Twisted Ru homostructures offer a promising strategy to enhance alkaline HOR catalysis.
- This novel catalyst design overcomes drawbacks of traditional heterostructures.
- The developed Ru catalyst represents a significant advancement for pure metallic catalysts in AEMFCs.
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