An accurate extraction of physiological and physical signals from human skin is crucial for health monitoring, disease prevention, and treatment. Recent advances in wearable bioelectronics directly embedded to the epidermal surface are a promising solution for future epidermal sensing. However, the existing wearable bioelectronics are susceptible to motion artifacts as they lack proper adhesion and conformal interfacing with the skin during motion. Here, we present ultra-conformal, customizable, and deformable drawn-on-skin electronics, which is robust to motion due to strong adhesion and ultra-conformality of the electronic inks drawn directly on skin. Electronic inks, including conductors, semiconductors, and dielectrics, are drawn on-demand in a freeform manner to develop devices, such as transistors, strain sensors, temperature sensors, heaters, skin hydration sensors, and electrophysiological sensors. Electrophysiological signal monitoring during motion shows drawn-on-skin electronics' immunity to motion artifacts. Additionally, electrical stimulation based on drawn-onskin electronics demonstrates accelerated healing of skin wounds.

Triple perovskite, Nd1.5Ba1.5CoFeMnO9−δ, enriched with oxygen defects shows high activity and durability as a bifunctional oxygen electrocatalyst.

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A-site cation doping in perovskite-based materials (ABO3 formula) has a significant effect on the bifunctional oxygen activity of the electrocatalysts with chemical stability, enabling the design of highly active, durable, and cost-effective catalysts.

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