期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 46, 页码 40235-40243出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b11510
关键词
heterojunction; WO3; Bi2S3; photoanode; photoelectrochemical water splitting
资金
- National Natural Science Foundation of China [51422206, 51772197, 51372159, 51502184]
- 333 High-level Talents Cultivation Project of Jiangsu Province
- Key University Science Research Project of Jiangsu Province [17KJA430013]
- 1000 Youth Talents Plan
- Distinguished Young Scholars Foundation by Jiangsu Science and Technology Committee [BK20140009]
- Six Talents Peak Project of Jiangsu Province
- Natural Science Foundation of Jiangsu Province [BK20150331]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
The rational design of semiconductor photoanodes with sufficient light absorption, efficient photogenerated carrier separation, and fast charge transport is crucial for photoelectrochemical (PEC) water splitting. Incorporating a small-band-gap semiconductor to a large-band-gap material with matched energy band position is a promising route to improve the light harvesting and charge transport. Herein, we report the fabrication of a threedimensional heterojunction with uniform Bi2S3 nanorods on WO3 nanoplates by hydrothermal process and chemical bath deposition. The seed layer strategy was used to assist the growth of Bi2S3 nanorods for perfect interface contact between WO3 and Bi2S3. The as-prepared WO3/Bi2S3 composite exhibited a much enhanced photocurrent (5.95 mA/cm(2) at 0.9 V vs reversible hydrogen electrode), which is 35 and 1.4 times higher than those of pristine WO3 and WO3/Bi2S3 composite without a seed layer, respectively. In addition, higher incident photon-to-current conversion efficiency (68.8%) and photoconversion efficiency (1.70%) were achieved. The enhancement mechanism was investigated in detail, and the sufficient light absorption, efficient charge transport, and high carrier density simultaneously contribute to the improved PEC activity. These findings will open up new opportunities to develop other highly efficient heterostructures as photoelectrodes for PEC applications.
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