The urgent need for sustainable, low-power energy solutions has driven intense research into advanced materials capable of harvesting energy from ambient sources such as light, heat, mechanical motion, and biochemical processes. These materials underpin emerging technologies, including self-powered sensors, wearable electronics, and distributed IoT systems. Rapid progress in nanostructured materials, hybrid composites, and interface engineering has expanded the performance limits of energy harvesting devices, making this field both highly dynamic and inherently interdisciplinary.

However, significant challenges remain. Many materials exhibit reduced efficiency under practical operating conditions, while issues such as long-term stability, environmental degradation, and material toxicity limit real-world deployment. Scalable and cost-effective manufacturing strategies are still underdeveloped, and integration of diverse material systems into compact, flexible, and multifunctional devices remains complex. In addition, inconsistencies in testing protocols and the lack of standardized benchmarking hinder meaningful comparison across studies.

This Collection aims to highlight method-focused articles, research articles, and review articles that reflect both established and emerging directions in the field. Topics will include (but not be limited to) synthesis and processing of advanced materials, device design and system integration, advanced characterization techniques, computational modeling, performance optimization strategies, and applications in diverse fields.

By consolidating methodological advances, novel discoveries, and reviews, this collection will provide the scientific community with a unified resource to guide future research, promote standardization, and accelerate the development of efficient, scalable, and application-ready energy harvesting technologies.