No, cucumbers should not be sliced before storing for hydration. Slicing them increases the surface area exposed to air, leading to faster moisture loss and spoilage.
Cucumbers are mostly water, which makes them susceptible to drying out quickly. When you slice a cucumber, you break its protective skin and expose the moist flesh to the environment. This allows water to evaporate more rapidly, causing the cucumber to become limp and less hydrating. Storing a whole, uncut cucumber in the refrigerator helps to retain its moisture and freshness for a longer period. The skin acts as a natural barrier, preventing water loss. For optimal storage, keep the whole cucumber in a plastic bag or airtight container in the crisper drawer of your refrigerator. This will help maintain a humid environment and further prevent dehydration.
If you only use part of a cucumber, wrap the cut end tightly in plastic wrap or place it in a sealed container with a damp paper towel to minimize moisture loss. This will help keep the exposed portion fresher for a day or two.