Conducting polymers (CPs) are an innovative class of materials recognized for their high flexibility and biocompatibility, making them an ideal choice for health monitoring applications that require flexibility. They are active in their design. Advances in fabrication technology allow the incorporation of CPs at various levels, by combining diverse CPs monomers with metal particles, 2D materials, carbon nanomaterials, and copolymers through the process of polymerization and mixing. This method produces materials with unique physicochemical properties and is highly customizable. In particular, the development of CPs with expanded surface area and high conductivity has significantly improved the performance of the sensors, providing high sensitivity and flexibility and expanding the range of available options. However, due to the morphological diversity of new materials and thus the variety of characteristics that can be synthesized by combining CPs and other types of functionalities, choosing the right combination for a sensor application is difficult but becomes important. This review focuses on classifying the role of CP and highlights recent advances in sensor design, especially in the field of healthcare monitoring. It also synthesizes the sensing mechanisms and evaluates the performance of CPs on electrochemical surfaces and in the sensor design. Furthermore, the applications that can be revolutionized by CPs will be discussed in detail.

Conducting polymers (CPs) have emerged as multifunctional components that modulate electrolyte and separator design for Zn-ion hybrid capacitors, with selected Zn-based battery and alkali-ion systems used as mechanistic references rather than direct performance evidence. Their π-conjugated backbones, tunable doping states, and reversible redox chemistry enable coupled ion transport, interfacial charge regulation, and mechanically compliant ion-conducting environments. However, CP integration also requires careful control of electronic leakage, self-discharge, short-circuit risk, and redox-state-dependent swelling, particularly when CP domains are introduced into separator architectures. This review examines how CP-containing electrolytes and separator-related architectures can regulate ion transport and interfacial charge distribution, provided that continuous electronic pathways are suppressed. In aqueous, quasi-solid gel, solid polymer, and redox-active electrolytes, CP-containing domains are examined in terms of ionic conductivity, Zn²⁺ transport, solvation regulation, and polarization mitigation. In separator-related architectures, spatially confined and electronically interrupted CP domains are discussed with emphasis on ion-flux homogenization, dendrite suppression, electron-blocking requirements, and dimensional stability. Comparative analyses separate directly demonstrated Zn-ion hybrid capacitor behavior from mechanisms inferred from related ion-storage systems. Finally, future directions are discussed for quantitative benchmarking, scalable CP processing, and architecture-controlled CP domains for coordinated electrolyte and separator design.