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A novel electrolyte additive for aluminium air battery to enrich the electrochemical performance in alkaline environment
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DOI：10.1016/j.ssi.2026.117184.png)
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Abstract
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The critical challenges such as self-corrosion and hydrogen gas evolution are impeding to enable the aluminium air battery for real-time applications. To mitigate those effects, the additive element boric acid was introduced into alkaline electrolyte in order to promote the electrochemical characteristics of the anodes. In this study, the aluminium alloy AA5052 was investigated in a potassium hydroxide electrolyte at different molar concentrations, both with and without additive recorded over 7200 s. The electrochemical performance of the anode was assessed using potentiodynamic polarization, electrochemical impedance spectroscopy, charge-discharge characteristics, and open circuit potential measurements. To examine microstructure and elemental characteristics of the anode, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy were employed. Additionally, thermal stability of the electrolyte was analysed using thermo gravimetric analysis and differential scanning calorimetry. The optimized electrolyte 4 M KOH + 22.0 g boric acid demonstrated superior performance, achieving a hydrogen gas evolution of 0.05 mL.cm-2.min-1, a mass loss of 0.0331 g, a corrosion current density of 38.82 mA.cm-2, an inhibition efficiency of 77.19%, charge transfer resistance of 42.17 Omega.cm2, polarization resistance of 37.76 Omega.cm2 and an open circuit potential of 1.487 V. In addition, the formation of protective layers like aluminium oxide and boron oxide were acted as an effective barrier to enhance electrochemical performance of the anode in an alkaline environment. This study supports the United Nations Sustainable Development Goals: 7 and 13.
Keywords:
Aluminium air battery
AA5052
Hydrogen gas evolution
Corrosion current density
Charge transfer resistance
Open circuit potential
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