Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 273, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119050
Keywords
Sulfur/potassium-co-doping; Graphitic carbon nitride; Photocatalysis; Hydrogen evolution
Funding
- National Natural Science Foundation of China [61605028, 61775040, 21673043]
- Program for Minjiang Scholar
- Program for Thousand Young Talent plan
- Swedish Research Council [2018-06868]
- Swedish Energy Agency [46641-1]
- Swedish Research Council [2018-06868] Funding Source: Swedish Research Council
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Modifying the structure of a photocatalyst to tailor its electronic and physicochemical properties is an effective approach for efficient photocatalysis. Herein, we demonstrate that co-doping non-metal (S) and metal (K) atoms into graphitic carbon nitride (g-C3N4) provides excellent visible-light photocatalytic hydrogen production activity of 8.78 mmol g(-1) h(-1), which is 98 times higher than that of pristine g-C3N4 (0.09 mmol g(-1) h(-1)). The apparent quantum efficiency of the S+K-co-doped g-C3N4 reaches 70 % at 420 nm. This outstanding photocatalytic performance attributed to an increased specific surface area from 6.78 to 74.23 cm(3) g(-1), which reduced the recombination of photogenerated charge carriers and enhanced conductivity. Various characterizations are undertaken to elucidate the S+K-co-doped g-C3N4 photocatalytic mechanism. Our work not only demonstrates a facile, eco-friendly and scalable strategy for the synthesis of S+K-co-doped g-C3N4 photocatalysts, but also opens a new avenue for the design of co-doped photocatalysts.
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