Innovative Approach to Enhancing Hydrogen Oxidation Reaction in Ni-W Alloys for Fuel Cells
Key Ideas
- Nickel-tungsten ratio in Ni-W alloys crucial for hydrogen oxidation reaction performance in fuel cells.
- Ni17W3 alloy demonstrated superior HOR activity compared to platinum carbon catalysts.
- Researchers fine-tuned unpaired electrons in Ni to enhance PZC and OHad, improving catalyst performance.
- New mechanism provides insights for improving non-precious metal alkaline HOR catalysts and developing non-platinum catalysts.
A research group at the University of Science and Technology of China led by Professor GAO Minrui has made significant progress in enhancing the performance of hydrogen oxidation reaction (HOR) in fuel cells. Their study focused on the nickel-tungsten (Ni-W) ratio in Ni-W alloys and how it impacts the HOR activity. By tuning the unpaired electrons in Ni, researchers were able to adjust the potential of zero charge (PZC) and hydroxyl adsorption (OHad) capacity of the alloy, leading to improved performance.
Hydrogen-oxygen fuel cells are seen as a promising solution for powering electronic vehicles due to their zero carbon emissions. The study revealed that Ni17W3 alloy showed the best HOR activity among the tested stoichiometric ratios, outperforming commercial platinum carbon catalysts. Through innovative approaches like in situ Raman spectroscopy and electron paramagnetic resonance, researchers gained insights into the electronic structure modulation and surface properties that influence the catalyst's performance.
The findings of this research have positive implications for advancing non-precious metal alkaline HOR catalysts and developing a new generation of non-platinum catalysts. By understanding the role of Ni-W ratio and electron configuration in enhancing catalyst performance, the study contributes to breaking through the current limits in fuel cell technology.