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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Seawater-Mediated Solar-to-Sodium Conversion by Bismuth Vanadate Photoanode- Photovoltaic Tandem Cell: Solar Rechargeable Seawater Battery

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Title
Seawater-Mediated Solar-to-Sodium Conversion by Bismuth Vanadate Photoanode- Photovoltaic Tandem Cell: Solar Rechargeable Seawater Battery
Author
Kim, Jin HyunHwang, Soo MinHwang, InchanHan, JinhyupKim, Jeong HunJo, Yim HyunSeo, KwanyongKim, YoungsikLee, Jae Sung
Issue Date
2019-09
Publisher
CELL PRESS
Citation
ISCIENCE, v.19, pp.232 - 243
Abstract
Conversion of sunlight to chemical energy based on photoelectrochemical (PEC) processes has been considered as a promising strategy for solar energy harvesting. Here, we propose a novel platform that converts solar energy into sodium (Na) as a solid-state solar fuel via the PEC oxidation of natural seawater, for which a Na ion-selective ceramic membrane is employed together with photoelectrode (PE)-photovoltaic (PV) tandem cell. Using an elaborately modified bismuth vanadate-based PE in tandem with crystalline silicon PV, we demonstrate unassisted solar-to-Na conversion (equivalent to solar charge of seawater battery) with an unprecedentedly high efficiency of 8% (expected operating point under I sun) and measured operation efficiency of 5.7% (0.2 sun) and long-term stability, suggesting a new benchmark for low-cost, efficient, and scalable solid solar fuel production. The sodium turns easily into electricity on demand making the device a nature-friendly, monolithic solar rechargeable seawater battery.
URI
https://scholarworks.unist.ac.kr/handle/201301/30615
URL
https://www.sciencedirect.com/science/article/pii/S2589004219302494?via%3Dihub
DOI
10.1016/j.isci.2019.07.024
ISSN
2589-0042
Appears in Collections:
ECHE_Journal Papers
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