Inhibiting hydrogen evolution reaction in aqueous aluminium ion battery using engineered hydrogel

Abstract

The Hydrogen Evolution Reaction (HER) is a critical side reaction that reduces the efficiency of Aqueous Aluminium-Ion Batteries (AAIBs). In this study, engineered hydrogel is utilised to inhibit HER in AAIBs as a functional interlayer. The Hydrogel Electrolyte (HE), designed with tailored chemical and structural properties, is aimed to effectively suppress the HER at the anode surface while maintaining stability in the aqueous electrolyte. The ability of the HE to modulate the electrochemical environment is investigated, revealing an improvement in the overall performance of the battery, including better long-term columbic efficiency with improved specific discharge capacities. The findings highlight the potential of HEs in advancing the development of AAIBs by mitigating unwanted side reactions, thus, to advance the creation of more efficient and sustainable energy storage systems.