Do them have electric wheel chairs? And wear is the rental place for them? Thank You

Yes, electric and manual. I believe you have to reserve the electric. Ahead of visit. You rent at the welcome center.

From the Cincinnati Zoo website: The Zoo has both strollers and wheelchairs for rent at the Welcome Center, located in Historic Vine Street Village, or at the Conservation Carousel in Safari Camp. We have a limited inventory and provide these items on a first come, first served basis. No advance registrations available for strollers or manual wheelchairs, however there are a limited number of ECVs (Electric Convenience Vehicle) that can be reserved each day – reserve an ECV(reservations may not be made on the day of your visit). We recommend arriving early to secure strollers and manual wheelchairs. For all rentals, a photo ID must be left with Zoo Staff at the rental location. Please note: if you are a member or have purchased a ticket that grants early entry- the Welcome Center is open when the Zoo opens.  Rental Fee information is available here.