Effect of Ag-doping strategies on the Lewis acid/base behavior of mesoporous TiO2 photocatalyst and its performance in CO2 photoreduction
Source abstract
Abstract
The nanostructure and doping of heteroelements are considered crucial for the photocatalytic reduction of CO2. Herein, we report the development and optimization of a mesoporous photocatalyst for the CO2 photoreduction (CO2PR) reaction through the integration of TiO2 with a CMK-3 template and template removal, followed by a focused study of silver-doping strategies using photodeposition and synchronous doping. Through investigating the effects of the charge-carrier recombination rates and acid/base behavior on CO2PR efficiency and product selectivity, we revealed that the influence on the CO2PR reaction follows the order of Lewis acid sites > Lewis base sites > charge-carrier recombination rates. Our proposed mechanism suggests that the Lewis acid sites regulate H+ production and control the CO and CH4 production rates and selectivity. In addition, we demonstrate irradiation-induced Lewis acid/base behavior of the photocatalyst by NH3-/CO2-temperature programmed desorption. Accordingly, our engineered photocatalyst comprising 1% synchronous Ag-doped mesoporous TiO2 calcinated at 470 °C (S-Ag1.0TC470) exhibited 96% CH4 selectivity and an 11-fold higher production yield than that of commercial P25.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Covalent Organic Framework Applications · CO2 Reduction Techniques and Catalysts
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (67)
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