Abstract
AbstractSolar energy is an abundant and renewable energy resource, but it must be captured and stored for practical application in view of the intermittency and low‐energy density. The search for an effective solar energy storage system is highly required, yet remains a challenge. In this paper, we design a novel solar energy storage device by integrating a TiO2 photo‐electrode into an aqueous zinc‐iodine battery (ZIB). During charging process under illumination, I− in catholyte is oxidized to I3− by photo‐excited holes from TiO2 photo‐electrode. Meanwhile, the photo‐excited electrons transfer to the anode through the external circuit and reduce the Zn2+ into Zn. Due to the compensation of photo‐voltage, an ultralow charging voltage of 0.56 V is achieved, much lower than the discharging voltage (1.2 V), resulting in 54 % input electric energy savings.
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