Platinum Plated Plastic Stars from Contact Lens Cleaners

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You will get pure Hydrogen at the negative electrode, and pure oxygen at +. When the bubbles rises from solution, H2 and O2 gases mixes together and you get what you call HHO gases. It does not matter what is electrode material. By the way, if you use aluminum in alkaline electrolyte, it will melt down. Simple chemistry

When the aluminum melts down it turns into aluminum oxide, the gas given off is pure H2. No mixing with Oxygen. The problem is controlling the reaction when vehicle is off because it requires no electricity. But once the aluminum or all the water is consumed the reaction ends. What you are left with is Aluminum Oxide and lye