MATERIALS IN ENERGY SYSTEMS: batteries, solar cells, fuel cells, supercapacitors reading comprehension passages. Which materials make clean energy cheaper, lighter, and longer lasting? Compare battery cathodes and electrolytes, perovskite solar cells, fuel cell catalysts, and supercapacitor electrodes using energy density, efficiency, and cycle life. Students link structure to performance with clear, classroom-ready examples. This digital resource features Read Aloud Audio, Self-Marking Multipl