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首页> 外文期刊>Catalysis science & technology >Design of visible-light photocatalysts by coupling of narrow bandgap semiconductors and TiO2: effect of their relative energy band positions on the photocatalytic efficiency
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Design of visible-light photocatalysts by coupling of narrow bandgap semiconductors and TiO2: effect of their relative energy band positions on the photocatalytic efficiency

机译：通过狭窄的带隙半导体和TIO2的耦合来设计可见光光催化剂：其相对能带位置对光催化效率的影响

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摘要

According to relative energy band positions between TiO2 and visible-light-absorbing semiconductors, three different types of heterojunction were designed, and their visible-light photocatalytic efficiencies were analyzed. In Type-A heterojunction, the conduction band (CB) level of sensitizer is positioned at a more negative side than that of TiO2, whereas in Type-B system its valence band (VB) level is more positive than that of TiO2 and in Type-C system the sensitizer energy level is located between the CB and VB of TiO2. In evolving CO2 from gaseous 2-propanol (IP) under visible-light irradiation, the Type-B systems such as FeTiO3/TiO2, Ag3PO4/TiO2, W_(18)O_(49)/TiO2, and Sb-doped SnO2 (AT0)/TiO2 demonstrated noticeably higher photocatalytic efficiency than the Type-A such as CdS/TiO2 and CdSe/TiO2, while the Type-C such as NiTiO3/TiO2, CoTiO3/TiO2, and Fe2O3/TiO2 did not show any appreciable improvement. Remarkably high visible-light photocatalytic activity of Type-B heterojunction structures could be explained by inter-semiconductor hole-transfer mechanism between the VB of the sensitizer and that of TiO2. The evidence for the hole-transport between sensitizer and TiO2 was also obtained by monitoring the hole-scavenging reactions with iodide (I~-) and 1,4-terephthalic acid (TA).
机译：根据TIO2和可见光吸收半导体之间的相对能带位置，设计了三种不同类型的异质结，并分析了它们的可见光光催化效率。在A型异质结中，敏化器的传导带（CB）水平的位置比TIO2的负面位置更为负面，而在B型系统中，其价带（VB）水平比Tio2和类型更为正面。 -c系统敏化能水平位于TIO2的CB和VB之间。在可见光照射下从气态2-丙醇（IP）中发展的二氧化碳中，诸如Fetio3/tio2，ag3po4/tio2，w_（18）o_（49）/tio2和SB-doped sno2（at0） ）/TIO2与诸如CDS/TIO2和CDSE/TIO2的A型相比，光催化效率明显更高，而诸如NITIO3/TIO2，COTIO3/TIO2和FE2O3/TIO2之类的Type-C则没有显示出任何明显的改进。 B型异质结构结构的明显高可见光催化活性可以通过敏化剂和TIO2的VB之间的血管间孔之间转移机制来解释。还通过监测与碘化物（I〜-）和1,4-恐怖酸（TA）的孔扫除反应（TA）来获得敏化剂和TIO2之间的孔传输的证据。

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