There are some feedback effects to acidification, one of which is that plankton will struggle. They absorb a lot of CO2. Someone else pointed out that we can

There are some feedback effects to acidification, one of which is that plankton will struggle. They absorb a lot of CO2. Someone else pointed out that we can cause blooms. That's basically what you want, because plankton or algae sequester it. I don't know that we can "hack" that without risking damaging the oceans though. They're pretty good at what they do as is. It is a gas exchange though, so heat and pressure have an impact. They're not great for marine life though. Surface area does as well, though it'd be hard to meaningfully change the ocean's surface area. The bigger issue would be containment. The ocean is huge, and a very good CO2 sink. Anything that's going to make a significant dent in the total CO2 absorption of the ocean is going to have to happen over a very large area. Things aren't going to be much better if we sterilize the ocean in the process.