Ergonomic Sponge Electrodes From Recycled PEDOT:PSS

ABSTRACT Emerging technologies in human–machine interfacing increasingly aim to develop solutions that naturally conform to the body's unique characteristics. Ergonomics and electrical performance in cutaneous sensing are crucial for accurate and reliable translation of biosignals. However, current sensor technologies are often constrained by bulky designs and hydrogel‐assisted skin interfaces that are prone to drying out, necessitate frequent replacement, and contribute to excessive electronic waste generation. In this study, we introduce the fabrication of mechanically soft, breathable sponge electrodes coated with a recycled conductive polymer, offering a gel‐free, skin‐conforming cutaneous interface. These electrodes are designed to feature bioinspired interface properties and high skin comfort due to their porous structures. When compared with electrodes made from pristine materials, the recycled versions demonstrate comparable high‐fidelity biopotential acquisition during simultaneous cardiac and low‐amplitude brain signal recordings. This work marks a significant step toward the development of ergonomic interfaces for long‐term health monitoring while adopting a sustainable approach to technological development.