An optical flow battery enabled by trap-engineered nanophosphors

Abstract Flow batteries represent a promising technology for storing electrical energy in circulating electrolyte solutions that contain redox-active chemicals. Inspired by the redox flow battery, in this paper we describe the concept and implementation of an optical flow battery, which stores photon energy in circulating nanophosphor colloids. Similar to the redox flow battery, the optical flow battery enables the conversion between photon energy and chemical energy in a rechargeable manner, facilitating distributed energy storage by decoupling energy and power. We characterized basic cell attributes and performance metrics of this prototype optical flow battery in the context of common assessment methods for conventional redox flow batteries. We envision that this optical flow battery may provide a useful tool for solar energy storage, light delivery in live animals, and light-based therapy, diagnosis, and surgery in medicine. Graphical Abstract