Owing to their remarkable success in photocatalytic applications, magnetoelectric (ME) and multiferroic (MF) materials have gained significant attention due to their exceptional coupling of electrical, magnetic, and optical properties. In addition to their appropriate band gaps, these materials exhibit inherent intrinsic polarizations enabling efficient charge carrier separation and their high mobility without the need for additional co-catalysts. This chapter delves into the multifaceted applications of MF and ME materials, emphasizing their roles in energy harvesting for portable electronics. Key developments include innovations such as self-charging MF modules, ultra-flexible ME heterostructure, and eco-friendly lead-free nanostructures that enhance energy storage and efficiency. Also this chapter examines the working principles of ME cantilever-based energy harvesters, highlighting their resonance conditions for optimal performance. The chapter further explores the synergistic effects of combining ME and photocatalytic processes for renewable energy harvesting, demonstrating advancements in self-powered systems and catalytic applications. Additionally, the role of domain walls in ME materials is discussed, with a focus on their impact on polarization and magnetic coupling. Concluding with future research directions, this chapter outlines the ongoing challenges and potential advancements needed to fully exploit the capabilities of these advanced materials in next-generation energy solutions.