Abstract

The global demand for clean and sustainable energy technologies has accelerated research into advanced materials capable of efficient electrochemical energy conversion and storage. Due to their unique physicochemical properties, high surface-to-volume ratio, tunable electronic structure, and enhanced catalytic performance, nanomaterials have gained recognition as promising candidates for future energy technologies. This chapter provides a comprehensive review of nanomaterials tailored for electrochemical applications, with emphasis on their synthesis approaches, morphological and electrochemical analysis, and functional effectiveness in wide range of energy systems. Various top-down and bottom-up synthesis methods are explored, ranging from conventional chemical techniques to green synthesis approaches, highlighting their advantages and limitations. Advanced characterization tools are presented for elucidating the architecture, composition, surface area, porosity, and electrochemical behaviour of nanostructures. Further chapter explores the application of nanomaterials in rechargeable batteries, supercapacitors, fuel cells, electrolyzers, and emerging CO2 reduction technologies, underlining their role in enhancing energy efficiency, durability, and sustainability. The key challenges including large-scale production, stability, and environmental concerns are critically examined, and future research directions are outlined to guide the advancement of cost-effective and scalable nanomaterials for sustainable energy solutions.