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Enhanced activity of mesoporous Nb_2O_5 for photocatalytic hydrogen production

机译：介孔Nb_2O_5的光催化制氢活性增强

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摘要

The mesoporous Nb_2O_5 photocatalysts were synthesized via an evaporation-induced self-assembly (EISA) method. The mesoporous structure of the as-made samples was studied by small-angle X-ray diffraction, N_2 adsorption-desorption isothermal and transmission electron microscopy. The increase of the calcination temperature during the synthesis resulted in enhanced crystallization, but decreased mesoporosity of the samples. The later was found to have a crucial influence on the photocatalytic activity by bringing on decreased BET surface area and especially increscent pore wall thickness. The advantage of the mesoporous Nb_2O_5 was also proved by performing 20 times higher photocatalytic activity than a bulk Nb_2O_5 without any porosity. A model was given to describe the effect of mesoporosity on the transportation and recombination of carriers.
机译：通过蒸发诱导自组装（EISA）方法合成了介孔Nb_2O_5光催化剂。通过小角X射线衍射，N_2吸附-解吸等温和透射电子显微镜研究了样品的介孔结构。合成过程中煅烧温度的升高导致结晶增强，但样品的介孔性降低。发现后者通过降低BET表面积，尤其是增加的孔壁厚度，对光催化活性具有至关重要的影响。介孔Nb_2O_5的优点还在于，其光催化活性比没有任何孔隙的块状Nb_2O_5高出20倍。给出了描述介孔性对载体运输和重组的影响的模型。

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