A Highly Porous Nanofibrillar PEDOT:PSS Matrix for Beyond‐Surface Precious‐Metal Utilization and Volumetric Electrocatalysis

), rapid reactant permeability, and structural robustness under operating conditions. The resulting PEDOT:PSS-Pt nanocomposite exhibits greatly enhanced catalytic activity for hydrogen evolution and methanol oxidation reactions, outperforming conventional planar Pt architectures. This work establishes highly porous nanofibrillar PEDOT:PSS as a previously underutilized volumetric electrocatalyst scaffold and provides a general design strategy for maximizing precious-metal efficiency in electrocatalysis and water-splitting systems.