Abstract
The catalyst layer composition and architecture play a pivotal role in bridging the gaps between ex situ and in situ catalyst activities in fuel cells.1 The catalyst-support architecture strongly influences the catalyst distribution, ionomer distribution and mass transport losses, occurring at high current density.2 Herein, a novel architecture based on self-standing fiber-network has been fabricated and characterized.3 The resulting porous structure of such catalyst layer is expected to control mass transport limitation across both the interface of catalyst layer by increasing the number of Triple Phase Boundaries. Further platinum catalyst is deposited onto this fibrous support as well as the ionomer. The full electrode is characterized for its morphology and electrochemically verified in both ex situ as well as in situ configurations. References (1) Jiantao Fan, Ming Chen, Zhiliang Zhao, Zhen Zhang, Siyu Ye, Shaoyi Xu, Haijiang Wang & Hui Li, “Bridging the Gap between Highly Active Oxygen Reduction Reaction Catalysts and Effective Catalyst Layers for Proton Exchange Membrane Fuel Cells”, Nature Energy, 6, 475–486, (2021).(2) Nagappan Ramaswamy, Wenbin Gu, Joseph M. Ziegelbauer and Swami Kumaraguru, “Carbon Support Microstructure Impact on High Current Density Transport Resistances in PEMFC Cathode”, Journal of The Electrochemical Society ,167, 064515, 2020.(3) Giorgio Ercolano, Filippo Farina, Sara Cavaliere, Deborah J. Jones and Jacques Rozière, “Towards Ultrathin Pt Films on Nanofibers by Surface-Limited Electrodeposition for Electrocatalytic Applications”, Journal of Materials Chemistry A , 5, 3974–3980, 2017.
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