A research team led by professors Shao Jinyou and Chen Xiaoliang at Xi'an Jiaotong University (XJTU) has achieved a breakthrough in high-fidelity wearable bioelectronics by proposing an innovative mixed ion-electron transduction mechanism that is volumetrically accessible.

This mechanism is designed to overcome the long-standing challenge of traditional electrodes failing to maintain low impedance and electrochemical stability during dynamic wear.

By constructing a volumetrically accessible mixed ion-electron transduction layer (PGWL), the team reduced interfacial impedance, stabilized electrode potential, and enhanced resistance to sweat and mechanical interference, thereby achieving high-fidelity physiological signal monitoring.

Based on the conductive polymer PEDOT:PSS, the PGWL synergistically incorporates graphite, aqueous polyurethane, and lithium bis(trifluoromethanesulfonyl)imide to maintain ion accessibility and electronic continuity within a mixed conductive network. This shifts ion-electron coupling from a "surface-limited" mode to a "bulk-participating" one.

This volumetric charge-compensation mode expands the electrochemically accessible volume and enhances charge-buffering capacity against hydration changes and mechanical disturbances, fundamentally breaking through the performance bottlenecks of traditional surface-transduction modes.

The research has been published in the internationally authoritative journal Advanced Materials under the title Volumetrically Accessible Ion–Electron Transduction for High-Fidelity Bioelectronics.