Study on bimetallic CuxZny supported TiO2 nanorods for enhanced photocatalytic H2 production
Metal cocatalyst plays a key role in improving the photocatalytic hydrogen production performance of TiO2 as the formation of Schottky junctions by metal-supported TiO2 can effectively promote the separation and migration of charge carriers.Bimetals usually have better cocatalytic performance than single metals,and the combination of different metals provides a way to overcome the limitations of single metals.Therefore,a series of bimetallic CuxZny supported TiO2(CuxZny/TiO2)photocatalysts were prepared for boosting photocatalytic hydrogen production.Zn can prolong the life span of photoexcited electrons.Cu does not only improve the migration of charge carriers,its surface plasmon resonance effect can effectively capture and convert the infrared light into heat energy for promoting hydrogen production reaction.The synergistic effect between Cu and Zn results in the CuxZny bimetal exhibiting significantly better cocatalytic performance than single Cu or Zn metals,more effectively inhibiting the recombination of photogenerated carriers in TiO2 and improving the utilization of these carriers,thereby further enhancing the utilization of sunlight.Cu3Zn3/TiO2 shows the highest photocatalytic hydrogen production rate of 3 726 μmol·g-1·h-1,which is 5.9 times that of pure TiO2.This study provides an important reference for the design of bimetallic cocatalysts and photothermal coupled catalysis.
Solar energyHydrogen productionPhotothermal catalysisBimetallic cocatalyst
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