Increasing energy crises in the world compel us to develop materials with functional properties to be used in various energy harvesting and energy storage devices. Nanomaterials have given an entirely new era to the development of the functional materials and devices, including the devices used in energy harvesting and storage for flexible applications. Choice of materials, preparation of their composites and hybrids, and their synthesis methods have emerged with a completely new age to produce functional nanomaterials used in energy application.

This special issue is intended to present and discuss recent challenges and technological advancement in production of functional nanomaterials and their application in energy harvesting and energy storage devices for flexible applications. Keeping in view of the recent developments in the production and use of functional nanomaterials, we invite high quality, original research articles or review articles focused on the current state-of-the-art functional nanomaterials for energy applications.

Potential topics include but are not limited to the following:

• Functional nanomaterials for flexible energy storage devices
• Functional nanomaterials for flexible energy harvesting devices
• Application of carbon nanomaterials and conducting polymers in flexible devices
• Application of electrospun nanomaterials for energy applications
• Various techniques to test the performance of energy storage and energy harvesting devices prepared using functional nanomaterials
• Durability and stability of the energy storage and energy harvesting devices prepared using functional nanomaterials
• Flexible energy harvesting devices and their challenges