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Analysis of the working principle: (a) the working principle of the W–TENG; (b) the circuit equivalent model of the W–TENG; (c) the simulation result of the output of W–TENG; (d,e) the analysis of charge-transfer direction for different materials; (f) the working principle of the C–ENG; (g) the circuit equivalent model of the C–ENG; and (h) the simulation result of the output of C–ENG.
