Production of Highly Anisotropic Sheet-like Porous Carbon Particles with Perpendicularly Oriented Channels Using Crystallizable Surfactant for Enhanced Proton Exchange Membrane Fuel Cell Performances
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Controlling the internal channel structure and shape of carbon particles is crucial for achieving distinct particle packing structures, which ultimately leads to enhanced performances when utilized as electrode materials. In this study, we introduce a novel production strategy for generating two-dimensional, uniform-sized sheet-like particles with high aspect ratio (AR) using crystallizable surfactant, C18OH. Due to its amphiphilic properties, C18OH reduces surface tension at the emulsion surface, inducing surface instability, and its crystallization property causes the emulsion to spontaneously spread in plane, resulting in the formation of high AR particles. By varying the particle size and surfactant, particles can be produced with different AR values. Increasing the AR maximizes particle packing density, and the interconnected vertical channels within the porous carbon structure create an efficient pathway for transporting materials in proton exchange membrane fuel cells.