Can I dock this phone to charge it or do I need to plug into electric outlet?

From (for an iPhone 11 - according to your tag):

https://support.apple.com/kb/SP804?viewlocale=en_US&locale=en_US

you can charge with:

• Fast‑charge capable: Up to 50% charge in 30 minutes10 with 18W adapter or higher (sold separately)
• Wireless charging (works with Qi chargers11)
• Charging via USB to computer system or power adapter

You can also try here:

https://www.apple.com/shop/iphone/accessories/power-cables?page=1&f=charger-iphone11&fh=458e%2B45d4%2B4bb4

and flor docks:

https://www.apple.com/shop/iphone/accessories/power-cables?page=1&f=dock-iphone11&fh=458e%2B45e3%2B4bb4