Now make this a marketable power-less air dehumidifier. This is one of those 'changing whole industries' things.
Those exist in the form of dehumidifier bags, and they're inexpensive and easy to get. Does this material have benefits over what's currently in use?
Dehumidifier bags are bulky. Surfaces, on the other side, can be folded into loops, which should increase the amount of humidity they can absorb.