You Do Need power plug adapter while traveling from Argentina to Barbados.

Here is Why You Need An Adapter

The outlet and plug type used in Barbados are A and B and in Argentina are C and I. This is how they look like.

Argentina

In Argentina, outlets of type C and I are in use.

Type C

Type I

Barbados

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

Type A

Type B