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Synopsis: Metastatic mucinous adenocarcinoma of the lower ureter is reported in a 55‐year‐old woman presenting with gross hematuria who was treated for cervical cancer 3 years prior. [ABSTRACT FROM AUTHOR]

Soft hydrogel iontronic devices, utilizing the assumed non‐Faradaic exchange of ions and electrons at the metal‐hydrogel interfaces, have been demonstrated with advantages of high stretchability, transparency, and biocompatibility. Yet, in real situation under high voltage, Faradaic reaction is inevitable, which can breakdown the device and lead to the low durability. Herein, the Faradaic breakdown behaviors of hydrogel iontronic devices under high AC voltage are systematically studied. Side reactions including electrode corrosion and water electrolysis are confirmed in the electrical double layer. Interface barrier layers are proposed to eliminate this issue. It is found that acetylene black (ACET) as modification layer can achieve the best performances, providing effective protection while maintaining the electrical performances. By leveraging ACET‐modified electrodes, long‐term durable iontronics, including electroluminescent devices and high‐output triboelectric nanogenerators, are successfully demonstrated. This work can provide insightful strategies for developing practical hydrogel iontronic devices. [ABSTRACT FROM AUTHOR]

Soft iontronics expand the toolbox of bio‐integrated or bio‐interfaced devices, owing to their natural resemblance with living systems; however, the development for analogous integrated ionic circuits is immature due to the difficulty of fabricating fundamental ionic logic elements. Among these, ionic diodes have motivated great endeavors for their unique ionic current rectifying characteristics. Nonetheless, it is still challenging to achieve high‐performance ionic diodes; also, most reported aqueous solution‐based ionic diodes fail to work at extreme temperatures, seriously hindering their practical uses. This work reports a highly rectifying, temperature‐tolerant, and flexible hydrogel ionic diode enabled by an ethylene glycol/water binary solvent system. The ionic diodes exhibit outstanding dehydration resistance to high temperatures (100 °C) and anti‐freezing performance at low temperatures (−20 °C). Rectification ratios as high as 1201 (with 0% ethylene glycol content) and 566 (with 40% EG content) are achieved, which are distinctly advantageous over most previous reports. A flexible four‐diode bridge full‐wave rectifier circuit is then fabricated, and its integration with the triboelectric nanogenerator for effective biomechanical energy harvesting is demonstrated. This work is believed to open up new insights for the development of future bio‐interfaced applications. [ABSTRACT FROM AUTHOR]