Journal
CATALYSIS LETTERS
Volume 151, Issue 6, Pages 1683-1692Publisher
SPRINGER
DOI: 10.1007/s10562-020-03426-2
Keywords
NiFe-layered double hydroxides; g-C3N4; photocatalysis; CO2 reduction
Categories
Funding
- 973 Program [2014CB932101]
- 111 Project [B07004]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1205]
- Fundamental Research Funds for the Central Universities [buctrc201527]
- Open Research Fund of State Key Laboratory of Multi-phase Complex Systems [MPCS-2017-D-06]
- National Natural Science Foundation of China
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The tightly 2D/2D heterojunction of g-C3N4/NiFe-layered double hydroxides (NiFe-LDH) prepared in situ showed improved transfer pathway of photogenerated electrons and holes, resulting in reduced recombination rate and increased efficiency and selectivity for CO2 reduction. The addition of g-C3N4 also modified the surface morphology and ductility of NiFe-LDH, providing more reaction sites for the reduction of CO2.
A tightly 2D/2D heterojunction of g-C3N4(g-CN)/NiFe-layered double hydroxides (NiFe-LDH) was prepared in situ. The proper band-gap matching between NiFe-LDH and g-CN increased the transfer pathway of photogenerated electrons and holes between semiconductors. This in turn effectively reduced the recombination rate of photogenerated electrons and holes. Meanwhile, addition of g-CN to the matrix modified the surface morphology of NiFe-LDH and prevented agglomeration of two-dimensional materials while increased their ductility. Moreover, specific area of NiFe-LDH was found 3.06 times larger for 5:1-NiFe-LDH/0.8 g-CN as compared to 5:1-NiFe-LDH. The larger surface area results in availability of multiple reaction sites for the reduction of CO2. Upon exposure to light for 4 h, the product revealed 55.79 mu mol/g and 20.45 mu mol/g efficiency for CO and CH4 respectively, which was 3.57 times higher than pure NiFe-LDH and 4.25 times higher than pure g-CN. Furthermore, the product revealed as high as 73.2% selectivity for CO. Results authenticate the prepared g-CN containing NiFe-LDH as highly stable, efficient and selective two-dimensional materials for CO2 reduction upon exposure to light. [GRAPHICS] .
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