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首页> 外文期刊>Energy Conversion & Management >Photocatalytic water splitting over CeO_2/Fe_2O_3/Ver photocatalysts
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Photocatalytic water splitting over CeO_2/Fe_2O_3/Ver photocatalysts

机译：CEO_2 / FE_2O_3 / VER Photocatalysts上的光催化水分

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摘要

The study is focused on the photocatalytic ability of nanocrystalline oxides Fe2O3 and CeO2 (marked as Fe and Ce) and their 8:2, 5:5 and 2:8 M ratio mixtures (marked as Fe8Ce2, Fe5Ce5 and Fe2Ce8) for the hydrogen production via water splitting. The photocatalysts were prepared using a precipitation procedure both in a "standalone" powder form and in form of the Fe2O3/CeO2 nanoparticles precipitated on vermiculite (Ver). The phase composition and the specific surface area of the samples, the size and morphology of nanocrystallites of individual phases, and the optical and electronic properties of the photocatalysts were characterized in detail by Xray powder diffraction, nitrogen physisorption, transmission electron microscopy, diffuse reflectance UV-Vis spectroscopy and work function measurements. Photocatalytic water splitting over the photocatalysts was performed during 8 h in annular batch photoreactor illuminated with 8 W Hg lamp (lambda = 254 nm). The most active photocatalysts were Fe8Ce2 both in "stand-alone" powder form and in form of the photocatalyst attached on vermiculite. The photocatalytic generation of hydrogen in the presence of the Fe2O3/CeO2 photocatalysts is controlled by the intrinsic photocatalytic properties of the oxides and by the specific surface of the composite. It is enhanced, when heterojunctions between Fe2O3 and CeO2 form. The work function measurements confirmed the formation of heterojunction Type I with bent bands, which effectively inhibits the recombination of photogenerated charge carriers. In addition, it was confirmed that the anchoring of the photocatalyst on vermiculite does not significantly degrade the photocatalytic activity of the composite. In contrast, even if the amount of the photocatalytically active component was three-times smaller as compared with the photocatalysts without vermiculite, just a slight decrease of the photocatalytic activity was observed.
机译：该研究专注于纳米碘氧化物Fe2O3和CeO2（标记为Fe和Ce）的光催化能力，其8：2,5：5和2：8M比例混合物（标记为FE8CE2，FE5CE5和FE2CE8），用于氢生产通过水分裂。使用以“独立”粉末形式的沉淀程序和沉淀在蛭石（Ver）上沉淀的Fe 2 O 3 / CeO2纳米颗粒的形式制备光催化剂。通过X射线粉末衍射，氮原始，透射电子显微镜，弥漫反射率紫外线表征了单相的纳米晶体的纳米晶体的纳米晶体的尺寸和形态，以及光催化剂的光催化剂的光学和电子性质-VIS光谱和工作功能测量。在8小时内在用8WHG灯（Lambda = 254nm）照射的环形批量光反应器期间进行光催化剂在光催化剂上进行。最活跃的光催化剂是FE8CE2，含有“独立”粉末形式，并以蛭石附着的光催化剂的形式。在Fe 2 O 3 / CeO2光催化剂存在下，光催化产生氢气由氧化物的内在光催化性能和复合材料的比表面控制。当Fe2O3和CEO2形式之间的异质结时，它得到了增强。工作功能测量证实了具有弯曲带的异质结型I的形成，其有效地抑制了光催化的电荷载体的重组。另外，证实光催化剂对蛭石的锚定不会显着降低复合材料的光催化活性。相反，即使光催化活性成分的量与没有蛭石的光催化剂相比，也比没有蛭石的光催化剂相比，即使观察到光催化活性的轻微降低。

著录项

  • 来源
    《Energy Conversion & Management》 |2021年第6期|114156.1-114156.9|共9页
  • 作者

    Reli Martin; Ambrozova Nela; Valaskova Marta; Edelmannova Miroslava; Capek Libor; Schimpf Christian; Motylenko Mykhaylo; Rafaja David; Koci Kamila;

  • 作者单位

    VSB Tech Univ Ostrava Inst Environm Technol CEET 17 Listopadu 15 Ostrava Czech Republic;

    VSB Tech Univ Ostrava Inst Environm Technol CEET 17 Listopadu 15 Ostrava Czech Republic;

    VSB Tech Univ Ostrava Inst Environm Technol CEET 17 Listopadu 15 Ostrava Czech Republic;

    VSB Tech Univ Ostrava Inst Environm Technol CEET 17 Listopadu 15 Ostrava Czech Republic;

    Univ Pardubice Fac Chem Technol Dept Phys Chem Studentska 573 Pardubice 53210 Czech Republic;

    Tech Univ Bergakad Freiberg Inst Mat Sci Gustav Zeuner St 5 D-09599 Freiberg Germany;

    Tech Univ Bergakad Freiberg Inst Mat Sci Gustav Zeuner St 5 D-09599 Freiberg Germany;

    Tech Univ Bergakad Freiberg Inst Mat Sci Gustav Zeuner St 5 D-09599 Freiberg Germany;

    VSB Tech Univ Ostrava Inst Environm Technol CEET 17 Listopadu 15 Ostrava Czech Republic;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Water splitting; Photocatalysis; Co-catalysts; CeO2; Vermiculite; Heterojunction;

    机译：水分裂;光催化;辅助催化剂;CEO2;蛭石;异质结;

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