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

Here is Why You Need An Adapter

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

Cape Verde

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

Type C

Type F

Puerto Rico

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

Type A

Type B