Journal
CHEMICAL ENGINEERING JOURNAL
Volume 401, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126135
Keywords
Photocatalysis; Hydrogen; Graphitic carbon nitride; Cobalt disul fide; Co-S bonding
Categories
Funding
- Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foundation of China [51888103]
- National Key Research and Development Project [2018YFB1502000]
- National Natural Science Foundation of China [51961165103, 51302212, 51906197]
- Natural Science Foundation of Shaanxi Province [2020JQ-040]
- Fundamental Research Funds for the Central Universities
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Considering the fact of the cost control in photocatalysis, it is significant to develop the noble-metal-free photocatalysis for H-2 evolution. Herein, CoS2 in-situ loading and S doping for g-C3N4 were synchronously constructed by hydrothermal and sulfidation processes. With systematical physicochemical characterizations, it was found that partial N atoms in g-C3N4 were replaced by S atoms, improving the visible-light absorption ability for more generation of photo-generated carriers. CoS2 as an effective noble-metal-free H-2-evolution cocatalyst induced and captured photo-generated electrons for promoting separation of photo-generated carriers synergistically with S doping. More contact between CoS2 and g-C3N4 were formed by the in-situ growth of CoS2 nanosheets on the surface of g-C3N4 nanosheets. It was important that Co-S bonding between CoS2 and S-doped g-C3N4 was built by the synchronous construction of CoS2 in-situ loading and S doping, strengthening the directed transfer of photo-generated electrons from S-doped g-C3N4 to CoS2. Accordingly, the synergetic function of CoS2 in-situ loading and S doping effectively elevated the noble-metal-free photocatalytic activity of g-C3N4 for H-2 evolution under visible-light irradiation.
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