Question

can we generate electricity from salt water​

Answer 1

Electricity generated with water, salt and a three-atoms-thick membran

Answer 2

$\mathcal{Question:}$Can we generate electricity from salt water?

$\mathcal{Answer:}$ Yes, we can generate electricity from salt water. As salts is an Ion, therefore these ions conduct Electricity in Water.

Whereas pure/distilled/rain water doesn't conduct Electricity.

Some Additional Information

Some of the first batteries, made by Alessandro Volta around 1880, used saltwater, silver and zinc to generate electricity.

Hope it helps you!