Alloying Matters for Ordering: Synthesis of Highly Ordered PtCo Intermetallic Catalysts for Fuel Cells.
Wei-Jie ZengChang WangPeng YinLei TongQiang-Qiang YanMing-Xi ChenShi-Long XuHai-Wei LiangPublished in: Inorganic chemistry (2023)
Porous carbon-supported atomically ordered intermetallic compounds (IMCs) are promising electrocatalysts in boosting oxygen reduction reaction (ORR) for fuel cell applications. However, the formation mechanism of IMC structures under high temperatures is poorly understood, which hampers the synthesis of highly ordered IMC catalysts with promoted ORR performance. Here, we employ high-temperature X-ray diffraction and energy-dispersive spectroscopic elemental mapping techniques to study the formation process of IMCs, by taking PtCo for example, in an industry-relevant impregnation synthesis. We find that high-temperature annealing is crucial in promoting the formation of alloy particles with a stoichiometric Co/Pt ratio, which in turn is the precondition for transforming the disordered alloys to ordered intermetallic structures at a relatively low temperature. Based on the findings, we accordingly synthesize highly ordered L1 0 -type PtCo catalysts with a remarkable ORR performance in fuel cells.
Keyphrases
- high temperature
- induced apoptosis
- high resolution
- highly efficient
- cell cycle arrest
- metal organic framework
- signaling pathway
- endoplasmic reticulum stress
- transition metal
- single cell
- stem cells
- oxidative stress
- molecular docking
- mass spectrometry
- magnetic resonance
- cell proliferation
- computed tomography
- cell therapy
- pi k akt
- fluorescent probe
- mesenchymal stem cells
- bone marrow
- solid phase extraction
- living cells
- high density
- molecular dynamics simulations
- tandem mass spectrometry
- tissue engineering