Cited 2 time in webofscience Cited 4 time in scopus

Solar-rechargeable battery based on photoelectrochemical water oxidation: Solar water battery

Title
Solar-rechargeable battery based on photoelectrochemical water oxidation: Solar water battery
Authors
Kim, G[Kim, Gonu]Oh, M[Oh, Misol]Park, Y[Park, Yiseul]
DGIST Authors
Kim, G[Kim, Gonu]; Oh, M[Oh, Misol]; Park, Y[Park, Yiseul]
Issue Date
2016-09-15
Citation
Scientific Reports, 6
Type
Article
Article Type
Article
ISSN
2045-2322
Abstract
As an alternative to the photoelectrochemical water splitting for use in the fuel cells used to generate electrical power, this study set out to develop a solar energy rechargeable battery system based on photoelectrochemical water oxidation. We refer to this design as a "solar water battery". The solar water battery integrates a photoelectrochemical cell and battery into a single device. It uses a water oxidation reaction to simultaneously convert and store solar energy. With the solar water battery, light striking the photoelectrode causes the water to be photo-oxidized, thus charging the battery. During the discharge process, the solar water battery reduces oxygen to water with a high coulombic efficiency (>90%) and a high average output voltage (0.6 V). Because the reduction potential of oxygen is more positive [E0(O2/H2O) = 1.23 V vs. NHE] than common catholytes (e.g., iodide, sulfur), a high discharge voltage is produced. The solar water battery also exhibits a superior storage ability, maintaining 99% of its specific discharge capacitance after 10 h of storage, without any evidence of self-discharge. The optimization of the cell design and configuration, taking the presence of oxygen in the cell into account, was critical to achieving an efficient photocharge/discharge. © The Author(s) 2016.
URI
http://hdl.handle.net/20.500.11750/2194
DOI
10.1038/srep33400
Publisher
Nature Publishing Group
Files:
There are no files associated with this item.
Collection:
Smart Textile Convergence Research Group1. Journal Articles


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