You Do Need power plug adapter while traveling from Sierra Leone to Macau.

Here is Why You Need An Adapter

The outlet and plug type used in Macau is G and in Sierra Leone are D and G. This is how they look like.

Sierra Leone

In Sierra Leone, outlets of type D and G are in use.

Type D

Type G

Macau

In Macau, outlets of type G are in use.

Type G