SENENTXU LANCEROS-MÉNDEZ, PHD, is Ikerbasque Professor at BCMaterials, Basque Center for Materials, Applications and Nanostructures, Spain and Associate Professor at the Physics Department of the University of Minho, Portugal. His work is focused in the area of smart and multifunctional materials for sensors and actuators, energy, and biomedical applications. CARLOS MIGUEL COSTA, PHD, is Researcher at the Physics and Chemistry Centers of the University of Minho, Portugal. His work is focused in the development of advanced polymer composites and novel materials and formulations for energy storage applications, including lithium-ion batteries, sodium-ion batteries, and printed batteries.