Apple is unlocking faster wireless charging on the iPhone X, iPhone 8 and iPhone 8 Plus with the iOS 11.2 firmware update. Up until iOS 11.1 the Qi-enabled iPhones could charge wirelessly by up to 5W and after 11.2 they can go as high as 7.5W - this was divulged by accessory maker RAVpower. The new, higher speed of the iPhone 8, 8 Plus and X doesn't quite put them as high as the competition from Samsung (which can reach 15W through a supported charger) but it may turn out that in practice they'll charge equally fast. There are several officially supported Qi fast wireless...
Source: https://www.gsmarena.com/ios_112_unlocks_faster_wireless_charging_on_iphone_x_8_and_8_plus-news-28240.php
