4.7 Article

Fluorination-enabled interface of PtNi electrocatalysts for high-performance high-temperature proton exchange membrane fuel cells

Journal

SCIENCE CHINA-MATERIALS
Volume 65, Issue 4, Pages 904-912

Publisher

SCIENCE PRESS
DOI: 10.1007/s40843-021-1839-8

Keywords

fuel cells; fluorinated carbon; interaction; activity; stability

Funding

  1. National Key R&D Program of China [2020YFA0710000]
  2. National Natural Science Foundation of China [21825201, U19A2017]
  3. Provincial Natural Science Foundation of Hunan [2019GK2031, 2016TP1009, 2020JJ5045]
  4. China Postdoctoral Science Foundation [2020M682541]
  5. Science and Technology Innovation Program of Hunan Province, China [2020RC2020]
  6. Changsha Municipal Natural Science Foundation [kq2007009]

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The use of dendritic Pt-Ni nanoparticles supported on fluorinated carbon black has been shown to significantly improve the performance and durability of HT-PEMFCs by forming a NixFy interface. This strategy effectively prevents Pt dissolution in practical fuel cells.
High-temperature proton exchange membrane fuel cells (HT-PEMFCs) bring new opportunities for portable power generation due to their outstanding advantages such as high tolerance to fuel/air impurities and simplified heat/water management. However, carbon-supported nanostructured Pt-based catalysts running at temperatures over 150 degrees C are challenged by the severe aggregation and carbon corrosion, thus leading to poor durability. Herein, we demonstrate that dendritic Pt-Ni nanoparticles supported on fluorinated carbon black (white carbon black) could significantly enhance the performance and durability of HT-PEMFCs as the cathode catalysts running at 160 degrees C due to the strong interaction of the F and Ni atoms to form a NixFy interface on Pt-Ni nanoparticles. With the formation of a stable NixFy interface, this integrated HT-PEMFC reached peak power densities of 906 mW cm(-2) and demonstrated excellent durability at 160 degrees C under anhydrous H-2/O-2 conditions. This mitigation strategy was applied to Pt-alloy/C electrocatalysts and resulted in the elimination of Pt dissolution in practical fuel cells.

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