Nanogenerators (NGs) can directly harness local energy sources, such as from motion or mechanical stress, to power portable and wearable devices. They are therefore attractive alternatives to batteries. Applications of NGs include sensors, actuators and electromechanical convertors. NGs use a dielectric layer for charge accumulation, which is typically a piezoelectric material. For NGs to be used in wearable electronics, flexibility is a key design parameter; however, existing piezoelectric-based NGsthat produce current ranging from nanoamperes to microamperesare often made up of bulk ceramics like lead zirconate titanate (PZT) with limited flexibility. For such applications, NGs that take advantage of the flexoelectric effect are especially attractive. Flexoelectricity is a basic property of any dielectric material wherein it exhibits a spontaneous electrical polarization induced by a strain gradient, rather than the coupling between polarization and homogeneous strain that exists in piezoelectric materials. Furthermore, as the magnitude of the strain gradient is inversely proportional to the relaxation length, flexoelectric effects are expected to increase in lower dimensional materials, making them a natural choice for flexible nanogenerators. In this aspect, two-dimensional (2D) materials provide enlarged strain gradients without compromising the flexibility of the device. However, the flexoelectric coefficients of available 2D materials are modest, with the highest reported value being 10 pC m -1 for MoS2 monolayers. In contrast to 2D materials, flexoelectric coefficients as high as μ1111 = 17.33 µC m -1 have been observed in bulk ceramics such as barium titanate that have limited flexibility. Hence, the performance of flexoelectric generators have been low.