Perspectives on Photocatalytic Paper‐based Batteries Fueled by Alcohol

Among the energy demands, innovative solutions are required to power various devices. Enter paper‐based microfluidic fuel cells (PµFCs) running on eco‐friendly alcohols from biomass. While lightweight and disposable, they mainly rely on costly noble‐metal catalysts for high efficiency. In this context, the concept of photo paper batteries (pPBs), utilizing affordable sunlight‐activated semiconductors to drive alcohol oxidation on paper, opens the possibility to disposable and affordable energy solutions. Our review highlights recent progress in PµFCs fueled by alcohols like methanol, ethanol, ethylene glycol, and glycerol. We explore semiconductor advancements driving anodic reactions and envision the potential of pPBs.