Highly Sensitive Oxidation‐Resistant Degradable Janus Piezoresistive Electronic Skin for Sustainable Wearable Electronics

Wearable sensors enable fast and accurate monitoring of physiological signals, with broad applications in electronic skin (e‐skin), biomedical engineering, and human–machine interfaces. However, their proliferation raises concerns about electronic waste. To mitigate this waste, biodegradable polymers have been used to develop eco‐friendly sensors. However, various challenges persist, including low conductivity, limited sensitivity, and poor stability. We introduce a degradable cellulose paper e‐skin coated with Ti 3 C 2 T x MXene and poly(3,4‐ethylenedioxythiophene)–polystyrene sulfonate (PEDOT:PSS) to overcome these challenges. The MXene/PEDOT:PSS‐coated cellulose paper piezoresistive e‐skin demonstrates ultrahigh sensitivity (19.27 kPa −1 ), a wide working range (0–40 kPa), linearity at low and high pressures, long‐term stability (5,600 cycles), and exceptional oxidation resistance (>22 days) owing to the stabilizing effect of PEDOT:PSS on MXene. In addition, the developed e‐skin has a hydrophilic contact surface with biological skin, and its external surface is highly hydrophobic, exhibiting Janus wettability that enhances its performance. Moreover, the e‐skin achieves high‐performance human motion monitoring by detecting both subtle and vigorous movements, such as joint flexions, vocal cord vibrations, and other motions. The developed piezoresistive e‐skin may find applications in diverse fields, such as human–machine interfaces, robotics, e‐skin, and wearable sensors by enabling precise and reliable stimuli detection.