You Do Need power plug adapter while traveling from Cape Verde to Sint Maarten.

Here is Why You Need An Adapter

The outlet and plug type used in Sint Maarten 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

Sint Maarten

In Sint Maarten, outlets of type A and B are in use.

Type A

Type B