期刊
ACS APPLIED ENERGY MATERIALS
卷 6, 期 1, 页码 334-341出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c03123
关键词
metal-organic framework; dye-anchoring strategy; Zr-MOF; photocatalytic CO2 reduction; solid-gas mode
This study reports a strategy to construct low-cost composite photocatalysts using metal-organic frameworks (MOFs), which can directly convert solar energy to high-value-added chemicals. Through a chemical bonding mode, the photocatalyst improves visible-light absorption and efficiently transfers photogenerated electrons, achieving the photocatalytic reduction of CO2.
The direct solar-driven CO2 conversion to high-value-added chemicals with high selectivity represents an attractive approach to address the energy crisis and environmental pollution. Herein, we report a facile dye-anchoring strategy with a metal- organic framework (MOF) to construct a series of low-cost visible-light-driven composite photocatalysts of rhodamine B (RhB)-sensitized Zr-MOF, x-RhB@Zr-MOF (x = 1-4). Benefiting from the coupling mode of chemical bonding rather than physical adsorption, the RhB molecules were firmly anchored in Zr-MOF, resulting in the improvement of visible-light absorption and the efficient transfer of photogenerated electrons from RhB to Zr-MOF. Significantly, 3-RhB@Zr-MOF exhibits enhanced photocatalytic performance for the reduction of CO2 to CO under visible-light illumination. The evolution rate of CO can reach 10.27 mu mol center dot g-1 in 4 h and the selectivity of >99% without the use of any organic sacrificial agents or photosensitizers, much superior to that of Zr-MOF. This work provides insight that will help in the construction of selective visible-light-driven catalysts for the photoreduction of CO2 through a solid-gas mode.
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