Abstract
AbstractDense iodinated reduced graphene oxide (rGO) with outstanding electrical and electrochemical properties is produced through a green method comprising liquid crystal‐mediated assembly of polyiodides and GO, and subsequent UV irradiation. The dense rGO electrode (1.46 g/cm3) exhibited a very high volumetric capacitance of 226 F/cm3, a factor of three larger than commercial activated carbon, and amongst the highest reported for graphene. The scalability is demonstrated by the fabrication of supercapacitor pouch cells that realized a volumetric energy density of 0.94 Wh/l, comparable to market products with similar footprint, while advantageously using a safe and green aqueous electrolyte. Our pouch cell powered battery‐less Internet of Things (IoT) sensor nodes and demonstrated sensing and transmission of over 40 temperature and relative humidity data packets. Our work establishes the critical advantages graphene‐based materials have over activated carbons in terms of ease of fabrication, tailorability, and enhanced volumetric energy density to advance the state‐of‐art in supercapacitor device research.
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