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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Black NiO-TiO2 nanorods for solar photocatalysis: Recognition of electronic structure and reaction mechanism
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Black NiO-TiO2 nanorods for solar photocatalysis: Recognition of electronic structure and reaction mechanism

机译：用于太阳能光催化的黑色NIO-TiO2纳米棒：电子结构和反应机制的识别

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摘要

This work provides an engineering guide to construct active sites on TiO2 nanorods (NRs) by coupling p-type black NiO nanoclusters (E-g = 1.42 eV) with rich crystal defects and match-up band structure for excellent solar photocatalysis. Photo-oxidation of toluene was used as a model reaction to evaluate the photocatalytic performance of black NiO/TiO2 hybrids under simulated solar light irradiation from a 300 W Xe-lamp. The black NiO/TiO2 hybrids Exhibit 80% of photodegradation conversion and 56% of mineralization efficiency, which are 7.9 and 4.5 times higher than those of TiO2 NRs. Detailed characterizations reveal that highly dispersed NiO and p-n heterojunction effectively facilitate light-harvesting, separation and transfer of photo-generated charge carries, and significantly inhibit the recombination of electrons and holes. Furthermore, the realignment of band structure and the p-n heterojunctions in NiO/TiO2 result in the production of center dot O-2(-) and h(+) with a longer lifetime, which could efficiently attack the aromatic ring of toluene. The efficient adsorption of toluene by H-bonding formation also facilitates the photo-oxidation of toluene on NiO/TiO2.
机译：这项工作提供了通过耦合具有丰富晶体缺陷和优异的太阳能光催化的晶体缺陷和匹配带结构的P型黑色NIO纳米细胞（E-G = 1.42eV）来构建TiO2纳米棒（NRS）上的活性位点。使用甲苯的光氧化作为模型反应，以评价来自300W XE灯的模拟太阳光照射下的黑色NIO / TiO2杂交物的光催化性能。黑色NIO / TiO 2杂交物表现出80％的光降解转化率和56％的矿化效率，比TiO2 NR高7.9％和4.5倍。详细表征揭示了高度分散的NIO和P-N异质结合有效地促进了光产生的电荷的光收获，分离和转移，并且显着抑制了电子和孔的重组。此外，带状结构的重新调整和NiO / TiO2中的P-N异质功能导致具有较长寿命的中心点O-2（ - ）和H（+）的产生，这可以有效地攻击甲苯的芳环。通过H键合形成的甲苯的有效吸附还促进了NiO / TiO2上甲苯的光氧化。

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