The adhesion and bonding performance of waterborne polyurethane (PU) coating on aluminum alloy surface was improved in this study. To achieve this objective, the effects of different sodium silicate concentrations on the aluminum alloy micro-arc oxidation (MAO) layer and the adhesion strength and corrosion resistance of MAO-PU composite coating before and after modification by MAO treatment of the 7050 aluminum alloy were studied. The experimental results showed that the modification of the MAO membrane layer by a silane coupling agent could significantly improve the adhesion strength and corrosion resistance of the composite coating. Moreover, the maximum adhesion strength was obtained when the concentration of sodium silicate was 12 g L⁻¹.

Electrochemical CO₂ reduction reaction (CO₂RR) driven by indium-based catalysts can convert CO₂ into C₁ products which have relatively low mass specific energy density. However, it is promising to gain C2 products by introducing Keggin-type polyoxometalates (POMs) that can effectively regulate proton coupled electron transfer ability to regulate the electrode-electrolyte interface. Here, the commercial indium sheets were combined with the Keggin-type POMs (H₄PVMoW₁₀O₄₀·15H₂O, PVMoW₁₀; H₅PV₂MoW₉O₄₀·10H₂O, PV₂MoW₉) to process CO₂RR. The highest Faradaic efficiency (FE) toward acetate reached 75.6% in PVMoW₁₀ system and the highest FE_ethanol reached 85.1% in PV₂MoW₉ system. XPS results suggested that the electron transfer of the POMs had a positive interaction with the active site In⁰, which provided a special electron channel to improve the FEs of C2 products in CO₂RR.