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Why the thin film form of a photocatalyst is better than the particulate form for direct solar-to-hydrogen conversion: a poor man's approach

机译：为什么光催化剂的薄膜形式优于直接太阳能 - 氢转化的颗粒形式：一种穷人的方法

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摘要

We demonstrated an easy method to improve the efficiency of photocatalysts by an order of magnitude by maximizing light absorption and charge carrier diffusion. Degussa titania (P25) and Pd/P25 composite photocatalyst thin films coated over regular glass plates were prepared and evaluated for solar hydrogen production in direct sunlight with aqueous methanol. It is worth noting that only UV light present in direct sunlight (similar to 4%) was absorbed by the catalysts. The hydrogen production activities of catalysts were compared for thin film and particulate forms at 1 and 25 mg levels. The hydrogen yield values suggested that 1 mg thin film form of Pd/P25 provided 11-12 times higher activity than 25 mg powder form. Comparable light absorption throughout the entire thickness of photocatalyst device and better contact of nanostructures that enabled the charge diffusion and charge utilization at redox sites are the reasons for high efficiency. While solar cells require charge carriers to diffuse through long distances of microns, they are utilized locally in an ensemble of particles (of nanometres) for hydrogen generation in photocatalyst thin films; this concept was used effectively in the present work.
机译：我们通过最大化光吸收和电荷载体扩散来证明了一种简单的方法来提高光催化剂的效率。制备涂覆在普通玻璃板上的Degussa二氧化钛（P25）和Pd / P25复合光催化剂薄膜，并评估了甲醇的直射阳光下的太阳氢生产。值得注意的是，仅阳光直射（类似于4％）的UV光被催化剂吸收。将催化剂的氢气产生活性与薄膜和颗粒形式进行比较，在1和25mg水平。氢屈服值表明，1mg薄膜形式的Pd / P25提供的活性高于25mg粉末形式。在光催化剂装置的整个厚度和更好的纳米结构接触的情况下，能够在氧化还原场所的充电扩散和电荷利用的更好的光吸收是高效率的原因。虽然太阳能电池需要电荷载流子通过长距离漫射，但它们在光催化剂薄膜中局部地在颗粒（纳米）的集合中局部地使用;这个概念在目前的工作中有效地使用。

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  • 来源
    《RSC Advances》 |2019年第11期|共7页
  • 作者

    Nalajala Naresh; Patra Kshirodra Kumar; Bharad Pradnya A.; Gopinath Chinnakonda S.;

  • 作者单位

    Natl Chem Lab Catalysis Div Dr Homi Bhabha Rd Pune 411008 Maharashtra India;

    Natl Chem Lab Catalysis Div Dr Homi Bhabha Rd Pune 411008 Maharashtra India;

    Natl Chem Lab Catalysis Div Dr Homi Bhabha Rd Pune 411008 Maharashtra India;

    Natl Chem Lab Catalysis Div Dr Homi Bhabha Rd Pune 411008 Maharashtra India;

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  • 正文语种 eng
  • 中图分类 化学;
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