Tungsten-Doped L10 -PtCo Ultrasmall Nanoparticles as a High-Performance Fuel Cell Cathode.
Jiashun LiangNa LiZhonglong ZhaoLiang MaXiaoming WangShenzhou LiXuan LiuTanyuan WangYaping DuGang LuJiantao HanYunhui HuangDong SuQing LiPublished in: Angewandte Chemie (International ed. in English) (2019)
The commercialization of proton exchange membrane fuel cells (PEMFCs) relies on highly active and stable electrocatalysts for oxygen reduction reaction (ORR) in acid media. The most successful catalysts for this reaction are nanostructured Pt-alloy with a Pt-skin. The synthesis of ultrasmall and ordered L10 -PtCo nanoparticle ORR catalysts further doped with a few percent of metals (W, Ga, Zn) is reported. Compared to commercial Pt/C catalyst, the L10 -W-PtCo/C catalyst shows significant improvement in both initial activity and high-temperature stability. The L10 -W-PtCo/C catalyst achieves high activity and stability in the PEMFC after 50 000 voltage cycles at 80 °C, which is superior to the DOE 2020 targets. EXAFS analysis and density functional theory calculations reveal that W doping not only stabilizes the ordered intermetallic structure, but also tunes the Pt-Pt distances in such a way to optimize the binding energy between Pt and O intermediates on the surface.
Keyphrases
- highly efficient
- density functional theory
- metal organic framework
- reduced graphene oxide
- ionic liquid
- room temperature
- visible light
- molecular dynamics
- single cell
- quantum dots
- stem cells
- high temperature
- induced apoptosis
- climate change
- cell therapy
- heavy metals
- dna methylation
- soft tissue
- cell cycle arrest
- wound healing
- cell death
- pi k akt
- electron transfer
- health risk assessment