Figure 2: Experimental results of the CMEOs and the CEO.
From: Standards and figure-of-merits for quantifying the performance of triboelectric nanogenerators

(a) The V–Q plot of the CEO with external load resistance of 250 MΩ. (b) The V–Q plot of the CMEO with external load resistance of 250 MΩ. (c) The V–Q plot of the CMEO with infinite external load resistance.