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- Title
Surface Fluorination to Boost the Stability of the Fe/N/C Cathode in Proton Exchange Membrane Fuel Cells.
- Authors
Wang, Yu‐Cheng; Zhu, Peng‐Fei; Yang, Hong; Huang, Long; Wu, Qi‐Hui; Rauf, Muhammad; Zhang, Jun‐Yu; Dong, Jiao; Wang, Kun; Zhou, Zhi‐You; Sun, Shi‐Gang
- Abstract
Abstract: The ternary Fe/N/C material is a promising non‐precious‐metal oxygen reduction electrocatalyst for proton exchange membrane cells (PEMFCs). However, its practical application is severely hampered by poor stability under PEMFC working conditions, especially at a cell voltage higher than 0.5 V. Herein, we report a new strategy to significantly improve the stability of the Fe/N/C catalyst in PEMFCs by covalent grafting of a trifluoromethylphenyl (Ar‐CF3) group. The hydrophobic character of Ar‐CF3 can effectively prevent water flooding of the Fe/N/C catalyst layer, and thus form robust mass‐transport channels for gas−liquid two‐phase flow. Simultaneously, both electron‐withdrawing and hydrophobic properties considerably suppress the oxidative corrosion of the carbon matrix that hosts the catalytically active sites. Therefore, fluorinated Fe/N/C could perform stably over 100 h at 0.5 V with a current density of 0.56 A cm−2 in a H2−O2 PEMFC. Even when the cell voltage increased to 0.6 V, only 15 % performance was lost after 100 h operation.
- Subjects
PROTON exchange membrane fuel cells; FLUORINATION; ELECTROCATALYSTS; HYDROPHOBIC interactions; OXYGEN reduction
- Publication
ChemElectroChem, 2018, Vol 5, Issue 14, p1914
- ISSN
2196-0216
- Publication type
Article
- DOI
10.1002/celc.201700939