Most commercial bank accounts offer a "nightly sweep" that moves your funds overnight into an interest-bearing account, and then back into your operational bank account. You will find that this is only offered for Treasury Managed services or something similar. This will incur higher monthly fees as well as per-transaction charges, so any benefits you'd get from the nightly sweep would be outweighed by the costs in this economic environment.

Stick with a regular business banking account, preferably one that charges few, if any, fees. Fees will eat up any interest you'd get anyways.