Yes, aluminium oxide (Al₂O₃) can be separated by electricity through a process called electrolysis. This is how aluminum is produced commercially.

Here's how it works:

1. Melting: Aluminium oxide has a very high melting point (over 2000°C), so it is dissolved in a molten mixture of cryolite (Na₃AlF₆) to lower the melting point and allow it to conduct electricity.

2. Electrolysis: The molten mixture is then subjected to a direct electric current. The positive electrode (anode) is made of carbon, and the negative electrode (cathode) is also made of carbon, but lined with a layer of aluminum.

3. Reactions: At the anode, oxygen is released:

2O²⁻ → O₂ + 4e⁻

4. Reactions: At the cathode, aluminum ions are reduced to aluminum metal:

Al³⁺ + 3e⁻ → Al

5. Separation: The aluminum metal is collected at the bottom of the electrolytic cell, while the oxygen gas is released.

This process is energy-intensive, but it is the most efficient way to produce aluminum on a large scale.