掺Ru的In2O3空心花生状结构的构建以增强日光照射下的光催化氮还原,Sustainable Energy & Fuels

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掺Ru的In2O3空心花生状结构的构建以增强日光照射下的光催化氮还原
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-3-30 , DOI: 10.1039/d1se00257k
Manh-Hiep Vu _{1,

2,

3,

4} , Toan-Anh Quach _{1,

2,

3,

4} , Trong-On Do _{1,

2,

3,

4}

Affiliation

最近，金属有机骨架（MOF）材料的合成被认为是设计和制造各种基于纳米结构的金属基功能性光催化剂的有效策略。在此，将掺有Ru的In ₂ O ₃空心花生（称为Ru–In ₂ O ₃ HPNs）衍生自在空气中煅烧的MIL-68-In（Ru）前驱体，作为有效的光催化体系进行氮的光还原。TEM图像显示的均匀分布在_2个ö ₃纳米颗粒，其是原位-组装形成空心花生结构。因此，这种定制的纳米结构有助于光致电子-空穴对的分离和传输，并有利于通过多次反射/散射进行光收集。而且，有意地将Ru掺杂剂引入到In ₂ O ₃半导体中作为活性位点，这不仅使能带隙变窄，而且导致形成大量的氧空位（OVs），从而促进了光催化还原反应。结果，Ru–In ₂ O ₃的独特结构表现出最高的光催化活性，为44.5μmolg ^-1 h ^-1在阳光照射下产生氨的能力分别是纯In ₂ O ₃空心花生和散装In ₂ O _3的5.7倍，远高于纯In ₂ O ₃。此外，Ru–In ₂ O ₃ HPNs在连续六个小时的两个小时测试（12小时）中没有显示出明显的活性衰减，因此对光催化固氮表现出优异的稳定性。这项工作可能会为中空材料用于光催化固氮的目标导向设计开辟一些见识。

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The construction of Ru-doped In2O3 hollow peanut-like structure for an enhanced photocatalytic nitrogen reduction under solar light irradiation

The synthesis of metal–organic framework (MOF) materials has been considered as an effective strategy for the design and fabrication of various nanostructured metal-based functional photocatalysts recently. Herein, Ru-doped In₂O₃ hollow peanuts (denoted as Ru–In₂O₃ HPNs) derived from MIL-68-In(Ru) precursor calcined in air was employed as an efficient photocatalytic system for the photoreduction of nitrogen. The TEM images revealed the uniform distribution of In₂O₃ nanoparticles, which are in situ-assembled to form a hollow peanut structure. Accordingly, this tailored nanostructure facilitates the separation and transportation of photoinduced electron–hole pairs and favor light harvesting by multi-reflection/scattering. Moreover, Ru dopants are intentionally introduced into the In₂O₃ semiconductor as active sites, which not only narrows the bandgap energy but also causes the formation of abundant oxygen vacancies (OVs), promoting the photocatalytic reduction reaction. As a result, the unique structure of Ru–In₂O₃ exhibited the highest photocatalytic activity of 44.5 μmol g⁻¹ h⁻¹ for ammonia production under solar-light irradiation, which is 5.7-times and much higher than that of pure In₂O₃ hollow peanuts and bulk In₂O₃, respectively. Further, Ru–In₂O₃ HPNs exhibited excellent stability for photocatalytic nitrogen fixation by showing no obvious activity decay for six consecutive two-hour tests (12 h). This work might open up some insights into the target-directed design of hollow materials for the photocatalytic nitrogen fixation.

更新日期：2021-04-13

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