期刊
ACS NANO
卷 12, 期 6, 页码 5333-5340出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b00110
关键词
zeolite-like frameworks; carbon nitride; photocatalysis; energy transfer; CO2 activation
类别
资金
- NSFC [21425102, 21601189, 21521061, 21403242]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- Youth Innovation Promotion of CAS [2016276]
- Chunmiao Projects of Haixi Institute of Chinese Academy of Sciences [CMZX-2016-003]
- NSF of Fujian province [2016J05052]
BIF-20, a zeolite-like porous boron imidazolate framework with high density of exposed B-H bonding, is combined with graphitic carbon nitride (g-C3N4) nanosheets via a facile electrostatic self-assembly approach under room temperature, forming an elegant composite BIF-20@g-C3N4 nanosheet. The as-constructed composite preferably captures CO2 and further photoreduces CO2, in high efficiency. The photogenerated excitations from the carbon nitride nanosheet can directionally migrate to B-H bonding, which effectively suppresses electron-hole pair recombination and thus greatly improves the photocatalytic ability. Compared to the g-C3N4 nanosheet, the BIF-20@g-C3N4 nanosheet composite displayed a much-enhanced photocatalytic CO2, reduction activity, which is equal to 9.7-fold enhancements in the CH4 evolution rate (15.524 mu mol g(-1) h(-1)) and 9.85-fold improvements in CO generation rate (53.869 mu mol g(-1) h(-1)). Density functional theory simulations further prove that the presence of B-H bonding in the composite is favorable for CO2, adhesion and activation in the reaction process. Thus, we believe that the implantation of functional active sites into the porous matrix provides important insights for preparation of a highly efficient photocatalyst.
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