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• MoS 2 is one of the most lucrative 2D materials for the NGs. • Single-layered MoS 2 is most suitable structure for the NGs. • MoS 2 based NGs have drawn a great attention in recent years. • MoS 2 based NGs are lucrative for wearable electronic applications. • Need intensive strategic research to mature the technology for practical application. Energy consumption and structure have changed in the new era along with the growth of the Internet of Things (IoT) and artificial intelligence, and the power sources for billions of dispersed gadgets and sensors have sparked attention globally to protect the environment. Due to the rising usage of non-renewable energy sources and the resulting environmental damage, researchers are investigating alternative energy systems that can harness energy from the environment. Therefore, self-sufficient small-scale electronic systems will be possible through the use of underutilised natural waste energy sources collected in nanogenerators (NGs). The features of the materials used have a significant impact on how well NGs work. In this regard Molybdenum disulfide (MoS 2), a 2D material, is one of the compounds that is discussed vastly nowadays due to its exceptional characteristics that made it useful in a variety of applications. Many research papers on the advancement and implementation of MoS 2 materials have been published, but this article will give an in-depth overview. It offers an introduction and interpretation of the main properties of 2D MoS 2 nanomaterials, starting with their current state, properties, and various synthesis processes. Later, the review concentrates on MoS 2 applications and energy-harvesting capabilities and gives a comprehensive study of piezoelectric, triboelectric and thermometrical nanogenerators based on 2D MoS 2 nanocomposite materials. [ABSTRACT FROM AUTHOR]