Journal
RARE METALS
Volume 40, Issue 4, Pages 808-816Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01637-5
Keywords
Dehydrogenation of formic acid; Graphitic carbon nitride; Schiff base; PdAg nanowires; Mott-Schottky heterojunction
Funding
- Heilongjiang Science Foundation [LH2020B006]
- National Natural Science Foundation of China [51871078, 21871221, 21602175]
- Fundamental Research Funds for the Central Universities [3102017jc01001]
- Start-Up Funding for Class D Talent of Xi'an University of Architecture and Technology [1608720038]
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The study found that the synthesized Pd5Ag5 NWs/g-C3.6N4 heterojunction exhibits the best dehydrogenation photocatalysis of formic acid without any additive at 25 degrees Celsius under visible light.
Developing an efficient photocatalyst, catalyzing formic acid (FA) dehydrogenation, can satisfy the demand of the H-2 energy. Herein, a graphitic carbon nitride (g-CxN4)-based nanosheet (x = 3.2, 3.6 or 3.8) with melem rings conjugated by Schiff-base bond (N=C-C=N) was synthesized, tuning the bandgaps (E-g) of graphitic carbon nitride (g-C3N4) in the range of 1.8 < E-g < 2.7 eV, and grown PdAg nanowires (NWs) on its surface forming an efficient PdAg NWs/g-CxN4 Mott-Schottky heterojunction for enhancing dehydrogenation photocatalysis of FA. The boosting photocatalysis benefits from the Schiff-base bond tuning the E-g of g-C3N4 and strongly coupling from the heterojunction. Among the heterojunction, the Pd5Ag5 NWs/g-C3.6N4 exhibits the best dehydrogenation photocatalysis of FA [turnover frequency (TOF) = 1230 h(-1)] under visible light (lambda > 400 nm) without any additive at 25 degrees C, which is the best value among ever-reported ones. This work provides a new strategy to boost dehydrogenation photocatalysis of FA, which will be promising for practical application of H-2 in future energy field.
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