Abstract
Graphitic carbon nitride (g-C3N4) has been demonstrated as a promising non-metal material for photocatalytic hydrogen evolution (PHE), while its photocatalytic activity is greatly limited due to the narrow visible light response-ability and the intrinsic severe charge deep trapping and recombination effects. Herein, a co-functionalized g-C3N4 system by Se doping and nitrogen vacancies modification is developed through a Se vapor-assisted-chemical vapor deposition synthetic strategy. Advanced characterization results revealed that Se dopants promote the visible-light absorption ability of g-C3N4, while nitrogen defects-induced shallow trap states are constructive to improving charge separation/transportation efficiency by effectively retarding the detrimental charge deep trapping and recombination. As a result, the synergistic effect of the Se dopants and nitrogen defects leads to a highly efficient PHE performance of g-C3N4. The integrated engineering strategy and mechanism understanding provided in this work may offer new insights into developing other novel photocatalysts for various applications.
Original language | English (US) |
---|---|
Pages (from-to) | 31590-31598 |
Number of pages | 9 |
Journal | International Journal of Hydrogen Energy |
Volume | 48 |
Issue number | 81 |
DOIs | |
State | Published - Sep 22 2023 |
Bibliographical note
Publisher Copyright:© 2023 Hydrogen Energy Publications LLC
Keywords
- Graphitic carbon nitride
- Nitrogen vacancies
- Photocatalytic hydrogen evolution
- Selenium doping
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology