Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 612, Issue -, Pages 367-376Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.12.077
Keywords
Carbon nitride; Cyanobenzene; C and O co-doped; Hydrogen production
Categories
Funding
- National Natural Science Foundation of China [21703097, 21972172]
- Southern University of Science and Technology (SUSTech) start fund through Shenzhen Peacock Talent program, Guangdong Provincial Key Laboratory of Energy Materials for Electric Power [2018B030322001]
- Guangdong Provincial Key Laboratory of Catalysis [2020B121201002]
- Shenzhen Clean Energy Research Institute [CERI-KY-2019-003]
- Presidential fund
- Development and Reform Commission of Shenzhen Municipality
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Graphitic carbon nitride (g-C3N4) is a promising photocatalyst for solar-driven water splitting, but suffers from severe charge recombination. This study demonstrates that dual heteroatoms (C and O) doped g-C(3)N(4) exhibits significantly improved catalytic performance and removal performance. The co-doping of carbon and oxygen induces the generation of mid-gap states, enhancing light harvesting and charge separation.
Solar-driven water splitting has been regarded as a promising strategy for renewable hydrogen production. Among many semiconductor photocatalysts, graphitic carbon nitride (g-C3N4) has received tremendous attention due to its two-dimensional structure, appropriate band gap and decent photocatalytic activity. However, it suffers severe charge recombination problems, affecting its practical performance. In this work, we demonstrated that dual heteroatoms (C and O) doped g-C(3)N(4 )can exhibit about 3 times higher catalytic performance for hydrogen evolution than that of the normal g-C(3)N(4 )with a hydrogen evolution rate reaching 2595.4 umol g(-1)h(-1) and an apparent quantum efficiency at 420 nm of 16.6%. The heteroatoms (C and O) doped g-C(3)N(4 )photocatalyst also exhibited superior removal performance when removing Rhodamine B (RhB). X-ray photoelectron spectroscopy (XPS), solid-state nuclear magnetic resonance (ssNMR) and X-ray absorption near-edge structure (XANES) spectroscopy reveal that the carbon and oxygen dopants replace the sp(2) nitrogen and bridging N atom, respectively. DFT calculations demonstrate the codoping of carbon and oxygen- induced the generation of mid-gap state, leading to the improvement of light harvesting and charge separation. (C) 2021 Elsevier Inc. All rights reserved.
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