Aqueous aluminium-air batteries (AABs) are promising candidates for next-generation energy storage devices owing to their high theoretical voltage and theoretical capacity of 2.98 Ah g⁻¹ with additional advantages of aluminium (Al) being abundant, cost-effective, and recyclable. Despite striking advantages, practical application of Al-air batteries is hindered by undesirable self-corrosion and passivation of Al surface, as well as severe hydrogen evolution reaction (HER), thereby reducing anodic efficiency and battery capacity. To address these issues, herein, a dual protective coating comprising LDH-PVA-acetal as an inorganic-organic hybrid material has been developed. This coating forms a stable film over the Al substrate and synergistically suppresses self-corrosion and HER by blocking bulk water molecules from direct contact with the Al anode along with slow diffused release of hydroxide ions. The battery assembled utilizing LDH-PVA-acetal/Al as anode demonstrates an outstanding capacity of 2577 mAh g⁻¹ and 2698 mAh g⁻¹ with 86.4% and 90.5% anodic utilization @30 mA cm⁻² and 50 mA cm⁻². A waste beverage can coated with LDH-PVA-acetal showed practical applicability towards waste to wealth, thus, demonstrating potential application towards corrosion inhibition in alkaline media for other metals as well.

水系铝空气电池（AAB）因其高理论电压和2.98 Ah g ^{-1的理论容量}以及铝（Al）丰富、成本效益高和可回收等优点而成为下一代储能设备的有希望的候选者。尽管具有显着的优点，但铝空气电池的实际应用受到铝表面不良自腐蚀和钝化以及严重的环境问题的阻碍。析氢反应（HER），从而降低阳极效率和电池容量。为了解决这些问题，本文开发了包含LDH-PVA-缩醛作为无机-有机杂化材料的双重保护涂层。该涂层在铝基板上形成稳定的薄膜，并通过阻止大量水分子与铝阳极直接接触以及氢氧根离子的缓慢扩散释放来协同抑制自腐蚀和HER。使用LDH-PVA-乙缩醛/Al作为阳极组装的电池表现出2577 mAh g ^-1和2698 mAh g ^-1的出色容量，在30 mA cm ^-2和50 mA cm ^{-2下阳极利用率分别为86.4%和90.5%}。涂有 LDH-PVA-乙缩醛的废饮料罐显示出变废为宝的实际适用性，因此也证明了在碱性介质中抑制其他金属腐蚀的潜在应用。