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Advanced energy materials: atom level active sites for semiconductor photocatalytic reduction of carbon dioxide

wallpapers News 2020-11-24

energy environment are two important issues related to the survival development of human society. As the combustion product of traditional fossil fuels the most important greenhouse gas carbon dioxide is an important link between energy environment. Therefore the transformation utilization of carbon dioxide to promote the natural carbon cycle alleviate the greenhouse effect energy shortage has recently attracted extensive attention. As a kind of green sustainable energy solar energy can be converted utilized by photocatalytic reduction of carbon dioxide. Semiconductor materials absorb a certain wavelength of light under illumination produce photogenerated electrons holes. These photogenerated electrons holes are transferred to the semiconductor surface then redox with carbon dioxide hole trapping agent adsorbed on the surface reducing carbon dioxide to hydrocarbons. Therefore there are active sites on the surface of semiconductor materials for carbon dioxide adsorption reaction product desorption different reaction sites have different effects on the process of carbon dioxide photoreduction.

Professor Qiao Shizhang's research team from the school of chemical engineering advanced materials University of Adelaide Australia analyzed summarized the influence of active sites with different composition on the photoreduction process of carbon dioxide from the atomic level: single atom defect surface active group hindered Lewis acid base pair (FLP). These four types of active sites can exp the range of photoresponse promote carrier separation secondary oxidation The photocatalytic efficiency product selectivity can be improved by carbon dioxide adsorption reducing the activation energy changing the reduction path of carbon dioxide. The

atom level reaction sites are directly related to the adsorption activation of carbon dioxide molecules in catalytic reactions. From this microscopic point of view the activity stability efficiency selectivity of different reaction sites can help us to underst the photocatalytic process design prepare new materials. Oxygen vacancies their exposed coordination unsaturated cations can act as adsorption sites for carbon dioxide molecules capture photogenerated electrons at the same time. The single atom sites promote the adsorption activation of carbon dioxide facilitate the accumulation of electrons to form deep products such as methane. The adsorption of carbon dioxide can be promoted by modifying the catalyst surface with active groups such as amino groups which have affinity for carbon dioxide. FLP as a two-component activation site is composed of hindered Lewis acid-base pairs (usually unsaturated metal ions hydroxyl). It can form a special electronic structure thus promoting the activation of carbon dioxide. This paper provides new ideas for the design of catalytic sites for the synthesis of bicomponent FLP.

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