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首页> 外文期刊>RSC Advances >Construction of full-spectrum-driven Ag–g-C3N4/W18O49 heterojunction catalyst with outstanding N2 photofixation ability
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Construction of full-spectrum-driven Ag–g-C3N4/W18O49 heterojunction catalyst with outstanding N2 photofixation ability

机译：全光谱驱动的Ag-gC 3 N 4 / W 18 O 49 异质结催化剂的制备N 2 光固定能力

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摘要

More than half of the solar spectrum is near infrared (NIR) light, which is seldom utilized in photocatalytic reactions. In this work, an Ag–g-C3N4/W18O49 heterojunction catalyst is prepared and used for full-spectrum-driven N2 photofixation from the UV to the NIR region for the first time. X-ray diffraction, N2 adsorption, UV-Vis-NIR spectroscopy, thermogravimetric analysis, photoluminescence, X-ray photoelectron spectroscopy and electrochemical impedance spectra were used to characterize the prepared catalysts. The result indicates that the as-prepared Ag–g-C3N4/W18O49 heterojunction catalysts display much higher N2 photofixation performance than that of individual W18O49 or Ag–g-C3N4, which should be due to the better separation rate of electron–hole pairs and more efficient light utilization. g-C3N4 is the active component in the catalyst for N2 photofixation. Ag loading promotes the separation rate of electron–hole pairs. W18O49 plays a role as light absorber in the full-spectrum to form more photogenerated electrons for recombining the holes in the g-C3N4 through “Z-scheme” mechanism. A possible electrons transfer route is proposed.
机译：太阳光谱的一半以上是近红外（NIR）光，在光催化反应中很少使用。在这项工作中，Ag–gC 3 N 4 / W 18 O 49 异质结催化剂，用于全光谱驱动的N 2 第一次从紫外线到近红外区域进行光固定。用X射线衍射，N 2 吸附，UV-Vis-NIR光谱，热重分析，光致发光，X射线光电子能谱和电化学阻抗谱来表征所制备的催化剂。结果表明，所制备的Ag–gC 3 N 4 / W 18 O 49 异质结催化剂显示的N 2 光固定性能要高得多。 W 18 O 49 或Ag–gC 3 < / small> N 4 ，这应归因于电子-空穴对的更好分离率和更有效的光利用。 gC 3 N 4 是N 2 固定。银载量提高了电子-空穴对的分离率。 W 18 O 49 在全光谱中起吸光剂的作用，形成更多的光生电子以进行重组通过“ Z-方案”机制在gC 3 N 4 中的孔。提出了一种可能的电子转移途径。

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