A brief review on solar charging of Zn-air batteries.

This brief review reveals the possibility of solar charging of Zn-air batteries. It describes the various configurations that have been adopted in order to employ solar radiation to directly charge Zn-air batteries, paying particular attention to simple constructions with a minimum number of components. Solar charging is differentiated from solar batteries, which are based on a different concept and mainly depend on the variation of the redox level of added electrolytes.