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materials. Any mechanical stimulus that brings about relative motion between the FEP film and the Cu-paper can be converted into electricity. Therefore, the KTENG can be operated under three different modes (stretching, pressing and twisting), and is capable of harvesting energy from various mechanical stimuli, such as pulling, tapping, wind blowing, etc. Figure 19 presents the schematics of the KTENG under different operating modes and their typical electrical outputs. The electrical outputs for the stretching mode were recorded when the device was stretched cyclically up to 28%, which yielded a maximum Voc of 7.32 V and a maximum Qtr of 2.64 nC. The pressing mode was demonstrated by hand clapping onto the device, and a maximum Voc of 115.49 V and a maximum Qtr of 39.87 nC were achieved. The twisting mode was realized when the device was hold in hands on both ends and twisted repeatedly, with a maximum Voc of 6.55 V and a maximum Qtr of 4.76 nC generated. The stretching and twisting modes had similar maximum output values but the uniformity of their output profiles as a function of time varied. The stretching outputs were nearly identical for different cycles while the twisting outputs varied from a cycle to another. As observed from experiments, the KTENG could easily recover back to original interlocking state when the stretching was released while it was not the case for twisting. The integrity of the rationally designed interlocking structure was prone to damaging when the device was twisted and the FEP rectangles tended to pop out from the linear notches on the Cu-paper. The original interlocking state could not be recovered automatically when the twisting force was released, and the resulted interlocking structure was random and usually uneven without perfect position match of the kirigami patterns, which made the outputs non-uniform from cycle to cycle. Fortunately, twisting would not break the materials themselves which were highly flexible owing to the kirigami patterns and their 54PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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