"expand our ability" is correct and usable in written English.
You can use this phrase in a sentence when referring to a situation where you are trying to increase a skill or capability. For example, "We need to expand our ability to solve problems quickly."
That would greatly expand our ability to monitor the environment.
We need to expand our ability to treat PTSD.
Among the most important, and least noticed, provisions in the reform legislation is one in the House bill to expand our ability to collect national health statistics.
If we want to expand our base, expand our ability to win elections, we're going to have to continue to move forward to where the voters are".
"By shifting content from the Executive Edition to the Web site, we expand our ability to deliver news in a much more timely way".
"This will greatly expand our ability to offer advertisers ways to more closely affiliate with branded entertainment," said Gary Shenk, chief executive at Corbis in Seattle.
I daresay we'd be better able to expand our abilities to find our way through life's thickets and emerge not only more creative, but also wiser.
This was the same approach that was used to sequence the metagenome of the A. glabripennis midgut and we anticipate that this will expand our abilities to more conclusively model the interactions between A. glabripennis and its gut microbes that enhance fitness and/or are required for survival in woody tissue.
Working with stakeholders — including those of responsible companies — expands our ability to move the levers of power in Washington.
These movements permanently enlarged art's footprint and blurred its borders, greatly increasing the number of accidental artworks available for appreciation by expanding our ability to appreciate them.
