Hybrid photoelectrochemical-rechargeable seawater battery for efficient solar energy storage systems

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Title
Hybrid photoelectrochemical-rechargeable seawater battery for efficient solar energy storage systems
Author
Han, JinhyupLee, SangwooYoun, ChulminLee, JinhoKim, YoungsikChoi, Taekjib
Issue Date
2020-02
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.332, pp.135443
Abstract
Eco-friendly harnessing of both ocean chemical energy and solar energy would represent a sustainable solution for future energy conversion/storage systems, but it has been challenging to enhance the energy efficiency of such systems for practical applications. Here, we demonstrate an efficient photoelectrochemical-assisted rechargeable seawater battery. By integrating TiO2 nanostructure-based photoelectrodes with the seawater battery, we achieved significant enhancement of the voltage efficiency during the charging/discharging processes; effective photocharging with the TiO2 photoanode reduced the charging voltage to similar to 2.65 V, while the heated carbon felt (HCF) cathode in the seawater battery exhibited charging/discharging voltages of similar to 3.8 V and similar to 2.9 V, respectively. Such a charging voltage reduction led to a voltage efficiency of similar to 109%. Moreover, interestingly, we found that TiO2 nanostructures showed excellent photoelectrochemical performances in seawater in association with the efficient photocharging. As a result, the utilization of TiO2 nanostructures as photocharging/discharging electrodes provides a feasible strategy to optimize the cell configuration for highly efficient solar seawater batteries.
URI
https://scholarworks.unist.ac.kr/handle/201301/30938
URL
https://www.sciencedirect.com/science/article/pii/S0013468619323151?via%3Dihub
DOI
10.1016/j.electacta.2019.135443
ISSN
0013-4686
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ECHE_Journal Papers
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