Engineering of electrodes with 2D Ti3C2Tx-MXene sheets and chloride salt for robust and flexible high electrical power triboelectric nanogenerator

•Layer-by-layer stacked vertical CS mode TMS-TENG was fabricated.•The optimized TMS-TENG exhibited short-circuit current (Isc) of ∼ 96 μA.•The Voc of 500 V and 200 V is obtained by hard press and soft press, respectively.•The output power density of 6.66 W·m−2 was observed with a loading of 10 MΩ.•TMS-TENG showed biomechanical energy harvesting and self-powered sensing.