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Electrical output of the Gr-TENG: (a) Short-circuit current (ISC) and (b) open-circuit voltage (VOC) of 1L-, 3L- and 5L-Gr-TENGs without Al2O3 CTL. (c) ISC and (d) VOC of 1L-, 3L- and 5L-Gr-TENGs with Al2O3 CTL. Average mean (e) current and (f) voltage generated by pristine Gr-TENGs (1L, 3L and 5L) and Gr-TENGs (1L, 3L and 5L) with Al2O3 CTL. Error bars indicate standard deviations for 4 sets of data points.
