Journal
NANO LETTERS
Volume 17, Issue 6, Pages 3803-3808Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b01147
Keywords
Hydrogen; evolution; CdS homojunction; gradient doping built-in electric field
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Funding
- Project on the Integration of Industry, Education and Research of Jiangsu Province [BY2015005-16, BK20150919]
- Key University Science Research Project of Jiangsu Province [15KJB430022]
- Six Talent Peaks Project in Jiangsu Province [XCL-029]
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Element doping has been extensively attempted to develop visible-light-driven photocatalysts, which introduces impurity levels and enhances light absorption. However, the dopants can also become recombination centers for photogenerated electrons and holes. To address the recombination challenge, we report a gradient phosphorus-doped CdS (CdS-P) homojunction nanostructure, creating an oriented built-in electric-field for efficient extraction of carriers from inside to surface of the photocatalyst. The apparent quantum efficiency (AQY) based on the cocatalyst-free photocatalyst is up to 8.2% at 420 nm while the H-2 evolution rate boosts to 194.3 mu mol.h(-1).mg(-1), which is 58.3 times higher than that of pristine CdS. This concept of oriented built-in electric field introduced by surface gradient diffusion doping should provide a new approach to design other types of semiconductor photocatalysts for efficient solar-to-chemical conversion.
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