Here are 5 that are all good chargers and should charge the 6 at full speeds. The first link is Best Buy, but you should be able to find it on Amazon or through Samsung directly:

https://www.bestbuy.com/site/samsung-25w-super-fast-charging-wall-charger-usb-c-black/6445194.p?skuId=6445194

https://smile.amazon.com/Belkin-Delivery-Charger-Adapter-Enabled/dp/B092PRSQMX/ref=sr_1_3?keywords=pd+PPS&qid=1636388522&s=wireless&sr=1-3

https://smile.amazon.com/Charger-Spigen-Charging-iPhone-Enabled/dp/B09F64WHWY/ref=sr_1_23?keywords=pd+PPS&qid=1636388522&s=wireless&sr=1-23

https://smile.amazon.com/gp/product/B08PSR4R37/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

https://smile.amazon.com/Charger-Anker-Adapter-Compact-Foldable/dp/B091DS2M8X/ref=sr_1_15?_encoding=UTF8&c=ts&dchild=1&keywords=Cell+Phone+Wall+Chargers&qid=1635947292&refinements=p_89%3AAnker&rnid=2528832011&s=wireless&sr=1-15&ts_id=12557637011