MXene-based materials for advanced nanogenerators

Energy harvesting devices are in urgent demand to meet the requirements of escalated energy consumption. Nanogenerators as emerging sustainable energy harvesting devices are attracting growing interest owing to the efficient transformation from mechanical energy into electrical energy. Nevertheless, there is still a distance from its commercial use due to the insufficient output performance of nanogenerators. Recently, 2D MXenes for nanogenerators has exhibited substantial encouraging progress owing to their superior merits of electronegativity, metallic conductivity, mechanically flexibility, tunable surface chemistry, etc. Since 2017, the MXenesbased materials for nanogenerators have risen enormously. Nonetheless, comprehensive reviews on this topic are rare. Here, we systematically reviewed the latest progress of MXenes for nanogenerators, aiming to boost scientific design tactics for practical application of nanogenerators from the perspectives of the fundamental principle and latest advances. Firstly, the fundamental background of nanogenerators is summarized and the superior properties of MXenes for nanogenerators are outlined. Subsequently, the design tactics and internal improvement mechanisms of MXenes for nanogenerator are comprehensively discussed and summarized. In the end, we proposed some perspectives on the future design strategies of MXenes-based materials for nanogenerators.