dc42:
The diode looks more than adequate, however the Rds(on) of the mosfet at Vgs=4.5v is quoted for Id=5A. Also the Rds(on) is on the high side, given that you want the mosfet to pass 10A. Look for a mosfet with Rds(on) as low as possible (certainly below 50 milliohms), quoted at Vgs=4.5v and Id >= 10A.
http://uk.farnell.com/vishay-formerly-i-r/irliz34gpbf/mosfet-n-60v-20a-to-220fp/dp/8660069
?
Vgs is 5V, will that be a problem?