ScholarWorks@중앙대학교

초록

Electrophoretic deposition (EPD) is a widely used method for assembling colloidal nanoparticle (NP)-based films for functional applications. However, a deeper understanding of key EPD parameters is necessary to clarify how conductive substrates influence the large-scale arrangement of colloidal NPs, particularly in achieving selective and conformal deposition. This study demonstrates the importance of the substrate structure and material, particularly the Cu layer in a nanowire (NW) configuration, for achieving a selective and homogeneous deposition of FeP NPs for acidic hydrogen evolution reaction (HER) electrodes. The Cu NW layer significantly enhanced the deposition uniformity and increased the electrochemically active surface area compared with bare microporous carbon paper (CP) and bulk Cu electrodes. The Cu NW-modified electrodes exhibited highly selective NP deposition and consistent catalyst morphology across various EPD solvent compositions with enhanced deposition kinetics facilitated by optimized nonpolar solvents and additives. The FeP/Cu NW/CP electrode demonstrated superior HER activity, as evidenced by its reduced Tafel slope and improved HER kinetics. Furthermore, the robust interaction between the Cu NW layer and NPs ensured HER stability. The potential of an engineered substrate design for high-performance HER electrodes depends on its ability to enable selective deposition, enhanced catalytic activity, and structural durability. © 2025 Hydrogen Energy Publications LLC

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