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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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Benchmark performance of low-cost Sb2Se3 photocathodes for unassisted solar overall water splitting

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Title
Benchmark performance of low-cost Sb2Se3 photocathodes for unassisted solar overall water splitting
Author
Yang, WooseokKim, Jin HyunHutter, Oliver S.Phillips, Laurie J.Tan, JeiwanPark, JaeminLee, HyungsooMajor, Jonathan D.Lee, Jae SungMoon, Jooho
Issue Date
2020-02
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.11, no.1, pp.861
Abstract
Determining cost-effective semiconductors exhibiting desirable properties for commercial photoelectrochemical water splitting remains a challenge. Herein, we report a Sb2Se3 semiconductor that satisfies most requirements for an ideal high-performance photoelectrode, including a small band gap and favourable cost, optoelectronic properties, processability, and photocorrosion stability. Strong anisotropy, a major issue for Sb2Se3, is resolved by suppressing growth kinetics via close space sublimation to obtain high-quality compact thin films with favourable crystallographic orientation. The Sb2Se3 photocathode exhibits a high photocurrent density of almost 30mAcm(-2) at 0V against the reversible hydrogen electrode, the highest value so far. We demonstrate unassisted solar overall water splitting by combining the optimised Sb2Se3 photocathode with a BiVO4 photoanode, achieving a solar-to-hydrogen efficiency of 1.5% with stability over 10h under simulated 1 sun conditions employing a broad range of solar fluxes. Low-cost Sb2Se3 can thus be an attractive breakthrough material for commercial solar fuel production. While photoelectrochemical water splitting offers an integrated means to convert sunlight to a renewable fuel, cost-effective light-absorbers are rare. Here, authors report Sb2Se3 photocathodes for high-performance photoelectrochemical water splitting devices.
URI
https://scholarworks.unist.ac.kr/handle/201301/31886
URL
https://www.nature.com/articles/s41467-020-14704-3
DOI
10.1038/s41467-020-14704-3
ISSN
2041-1723
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