Yes, you can use standard AED pads are suitable on children older than 8 years. For children under 8, special infant/child pads or ‘keys’ are available that adjust the current delivered by the Defibrillator to be suitable for a child.
In an emergency, if an AED with adult pads is the only device available, you should definitely consider using it. Apply one pad to the front of the chest, and one to the back to ensure they do not touch each other on the child’s chest.