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Ionotronics
An hourglass measures time by a regulated flow of sand through a narrow neck. In article number 2213677, Jianyu Li and co‐workers show that with similar shapes, ionic junctions regulate ion flow, allowing unidirectional current conduction. Like sand in an hourglass, microgels can be the building blocks of such ionotronics to achieve printability and tough mechanics. The ionic junctions...
Emerging soft ionotronics better match the human body mechanically and electrically compared to conventional rigid electronics. They hold great potential for human‐machine interfaces, wearable and implantable devices, and soft machines. Among various ionotronic devices, ionic junctions play critical roles in rectifying currents as electrical p–n junctions. Existing ionic junctions, however, are limited...