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injection, and the maximum achieved output charge density under short circuit condition is limited to 160 μC/m2 by air breakdown and decreases to 140 μC/m2 within 8 s. Under any load condition, therefore, the existence of air breakdown greatly limits the maximum retainable charge density in TENG as well as other triboelectrification applications. Figure 4. Air breakdown effect in TENG. (a) Working principle of a contact-separation- mode TENG. (b) COMSOL simulation of the potential distribution between two charged surfaces (charge density 50 μC/m2, gap distance 1 cm). (c) The existence of air breakdown in TENG even at low surface charge density under open-circuit condition. (d) Air breakdown in TENG under short-circuit condition after ion injection. Bottom-left insert records the in-situ measurement of the charge flow from the ground to the bottom electrode of the PTFE film during the step-by-step ion injection process; bottom-right insert plots the charge transfer between the two electrodes of TENG operating after the ion injection. (e) Air breakdown voltage at different pressures and gap voltage of TENG with different charge densities. The thickness of PTFE film is 200 μm. Reproduced with permission.71 Copyright 2017, Springer Nature. Paschen’s law describes the empirical relationship between the gaseous breakdown voltage (Vb) and the product of the gas pressure (P) and gap distance (d), and is given by 14PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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