A Photochemical Storage Battery with an <i>n</i>-GaP Photoelectrode

Abstract

Abstract We have constructed a photochemical storage battery with an n-GaP Photoelectrode. A two-compartment cell, n-GaP|aqueous K3[Fe(CN6]–K4[Fe(CN)6||aqueous NiSO4|Pt, is capable of being charged by the irradiation of the photoelectrode. The current efficiency of nickel deposition on the storage electrode was 80%. When we drew electrical energy out of the dattery, the deposited nickel could act as a Ni electrode in the Ni2+ solution. The power efficiency of the storage battery amounted to about 2%. We could recharge the battery more than five times after discharge.