Tribomaterials are important not only for improving the output performance of energy harvesting devices but also for extending their applications. In general, the static surface charges are created by the contact electrification, in which the driving force is possibly related to the difference of the surface chemical potential. However, as limited by the surface potential difference, the charge density generally cannot reach an ultimate high level to approach, commonly ~ tens of uC/m2. Here, we present facile strategies to maximize the charge density via sophisticated materials design as well as the potential applications such as filters for polluted air, microbial disinfection, and energy harvesting devices.
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