Iontronic power sources have attracted widespread attention in the field of energy harvesting and storage. However, conventional devices only generate an output voltage of ~1.0 V. Herein, we have developed units with an ultra-high voltage of ~2.0 V per unit based on osmotic effects and fine-tuning interfacial redox reactions. These systems are designed to harness the efficient ion dynamics of K+ within graphene oxide nanofluidic channels and tailor Faradaic processes at the interfaces. Printable, scalable, and optimized through fractal design, these miniaturized units are capable of directly powering commercial electronics, presenting a transformative paradigm for salinity gradient-based power generation. This approach offers a safe, ultra-thin, and portable solution for next-generation energy systems.
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