You Do Need power plug adapter while traveling from Puerto Rico to Cape Verde.

Here is Why You Need An Adapter

The outlet and plug type used in Cape Verde are C and F and in Puerto Rico are A and B. This is how they look like.

Puerto Rico

In Puerto Rico, outlets of type A and B are in use.

Type A

Type B

Cape Verde

In Cape Verde, outlets of type C and F are in use.

Type C

Type F