1. Introduction to 2D MXenes: Fundamental Aspects, MAX Phases and MXene Derivatives, Current Challenges and Future Prospects 2. Synthesis Methods and Surface Chemistry/Functionalization of MXene 3. Structure, Defects and Electronic Properties of MXenes 4. Optical and Mechanical Properties of MXenes 5. Topological Properties of MXenes 6. MXenes and their Composites for Energy Storage and Energy Conversion 7. MXenes and their Composites: An Emerging Materials for Gas Sensing and Biosensing 8. MXene and their Composites as Piezoresistive Sensors 9. MXenes and their Composites for Lithium and Sodium Ion Battery Applications 10. MXenes Based Materials for Lithium-Sulphur and Multivalent Rechargeable Batteries 11. MXenes and their Composites for Hybrid Capacitors and Supercapacitors 12. MXenes and their Composites: A Promising Materials for Hydrogen Storag 13. MXene and their Composites for Flexible Electronics 14. Applications of MXenes and their Composites in Catalysis and Photoelectrocatalysis 15. MXenes and their Composites Based Materials for Medical and Biomedical Applications 16. MXenes and their Composite for Potential Antimicrobial Applications 17. MXene Based Materials for Remediation of Environmental Pollutants 18. MXene Based Molecular Sieving Membranes for Highly Efficient Gas Separation 19. MXene Based Membranes for Water Desalination 20. MXenes Based Multifunctional Polymer Composites for EMI Shielding Applications 21. MXenes and their Composites for Energy Harvesting Applications 22. MXenes Based Flexible Polymer Composites as High Dielectric Constant Materials