MnO₂ Nanowires with Sub-10 nm Thick Conjugated Microporous Polymers as Synergistic Triboelectric Materials

MnO₂ nanowires coated with conjugated microporous polymers (CMP) are applied as triboelectric energy harvesting materials. The tribopositive performance of the CMP shells is enhanced with the assistance of MnO₂ nanowires (MnO₂ NW), likely due to cationic charge transfer from the tribopositive CMP layers to the surface Mn²⁺ and Mn³⁺ species of MnO₂ NW. This is supported by model studies. The MnO₂@CMP-2 with sub-10 nm thick CMP layers shows promising triboelectric output voltages up to 576 V and a maximum power density of 1.31 mW cm^-2. Spring-assisted triboelectric nanogenerators fabricated with MnO₂@CMP-2/PVP-3 films are used as power supplies to operate electronic devices.