Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 46, Pages 16668-16675Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201910510
Keywords
O-S bonds; photoanodes; P-N junctions; SnS2
Categories
Funding
- National Natural Science Foundation of China [51772197, 51422206, 51372159, 11675117, 51861135101]
- 1000 Youth Talents Plan
- Key University Science Research Project of Jiangsu Province [17KJA430013]
- Six Talents Peak Project of Jiangsu Province
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- 333 High-level Talents Cultivation Project of Jiangsu Province
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A photoelectrochemical (PEC) cell can split water into hydrogen and oxygen with the assistance of solar illumination. However, its application is still limited by excessive bulk carrier recombination and sluggish surface oxygen evolution reaction (OER) kinetics. Taking SnS2 as an example, a promising layered optoelectronic semiconductor, Ar plasma treatment strategy was used to introduce a SnS/SnS2 P-N heterojunction and O-S bond near the surface of a SnS2 nanosheet array, simultaneously increasing the separation efficiency of photogenerated electron-hole pairs in the bulk and lowering the OER overpotential at the surface. The onset potential of the plasma-treated SnS2 nanosheet array shifts negatively to 0.16 V, and the photocurrent density at 1.23 V vs. RHE boosts to 2.15 mA cm(-2), which is 7 times that of pristine SnS2. This work demonstrates a facile plasma treatment strategy to modulate the energy band structure and surface chemical states for improved PEC performance.
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