Suppressing Aluminum Self-Corrosion and Hydrogen Evolution in Alkaline Aluminum–Air Batteries via Stable Interfacial Reorganization and Hydrophobic Shielding Induced by Tetrabutylphosphonium Methanesulfonate
Abstract
Abstract The suppression of aluminum self-corrosion and parasitic hydrogen evolution remains a major challenge limiting the practical performance of alkaline Al–air batteries. In this work, tetrabutylphosphonium methanesulfonate (TBPMS) was investigated as a multifunctional ionic-liquid additive for stabilizing the aluminum/electrolyte interface in 1.0 M NaOH solution. The inhibition performance was evaluated using potentiodynamic polarization, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS), while the resulting surface morphology and roughness were examined by SEM/EDS and atomic force microscopy (AFM). The electrochemical measurements revealed a pronounced decrease in corrosion current density accompanied by substantial increases in polarization resistance and charge-transfer resistance, indicating effective suppression of both aluminum dissolution and hydrogen evolution. Time-dependent EIS measurements demonstrated that the protective characteristics of the adsorbed layer became progressively more pronounced with increasing immersion time, suggesting gradual interfacial reorganization and stabilization. SEM/EDS observations showed a smoother and less corroded surface in the presence of TBPMS together with the appearance of phosphorus- and carbon-containing species, whereas AFM analysis confirmed a marked reduction in surface roughness. Analysis of hydrogen evolution kinetics and prolonged cathodic polarization behavior further…
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