N-doped MWCNTs are widely utilized in energy storage devices, particularly in supercapacitors and lithium-ion batteries, due to their enhanced electrical conductivity and improved charge storage capacity. Their unique structure and nitrogen doping make them effective catalysts in fuel cells, facilitating oxygen reduction reactions with higher efficiency. In the field of electronics, they are employed in the development of advanced sensors and field emission devices, offering superior sensitivity and performance. Additionally, N-doped MWCNTs are used in environmental applications, such as water purification and gas adsorption, where their modified surface properties enable efficient removal of pollutants and contaminants. Their mechanical strength and lightweight nature also make them suitable for reinforcing composite materials in aerospace and automotive industries.