Aqueous, Rechargeable Liquid Organic Hydrogen Carrier Battery for High-Capacity, Safe Energy Storage

Energy storage is critical for the widespread adoptionof renewableenergy. Hydrogen gas batteries have been used to address the safetyand environmental concerns of conventional lithium-ion batteries.However, hydrogen storage and delivery pose safety concerns; thus,the concept of Liquid Organic Hydrogen Carriers (LOHCs) has emerged.Herein, we demonstrate an LOHC battery concept as a safer alternativeby using cyclohexanol (CHOL) and isopropanol (IPA) as anode materials,which can be interconverted with their redox counterparts with reversibilityand selectivity under Pt catalysis with potential control. The CHOL-basedcoin cell achieves 374 mAh/g of charge capacity at 1C and 90% charge-dischargeefficiency for over 300 h. The IPA-based cell delivers 525 mAh/g chargecapacity at 1C and maintains 95% charge-discharge efficiency.The LOHC battery has significant potential for energy storage applicationsand enables the assembly of the battery under ambient conditions,providing a promising outlook for high-performance and safe energystorage systems.