can I use USB-C with an iPad Air 2?

If your Power Adapter (charger) presents a USB-C connector, then you’ll need a Lightning to USB-C cable. Here is an Apple cable that is compatible and will do the job:

USB-C to Lightning Cable (1m)

https://store.apple.com/uk/xc/product/MX0K2ZM/A

This Apple cable is available in both 1m and 2m versions. Other reputable manufacturers, such as Belkin, produce similar cables.

No, the iPad Air 2 does not use USBC

iPad Air 2 uses lightning connector

You can use whatever end you want the charger end of the cable, USBA or USBC.

Just make sure your charger has the correct wattage to charge the Ipad