Enhanced UV-Vis-NIR activated photocatalytic activity from Fe3+-doped BiOBr:Yb3+/Er3+ upconversion nanoplates: synergistic effect and mechanism insight†,Inorganic Chemistry Frontiers

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Enhanced UV-Vis-NIR activated photocatalytic activity from Fe3+-doped BiOBr:Yb3+/Er3+ upconversion nanoplates: synergistic effect and mechanism insight†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-11-14 00:00:00 , DOI: 10.1039/c8qi01098f
Yongjin Li _{1,

2,

3,

4,

5} , Lu Yao _{1,

2,

3,

4,

5} , Dekang Xu _{5,

6,

7,

8} , Yulin Hu _{1,

2,

3,

4,

5} , Shenghong Yang _{1,

2,

3,

4,

5} , Yueli Zhang _{1,

2,

3,

4,

5}

Affiliation

Upconversion (UC) materials are recognized as promising candidates to harvest solar energy for photocatalysis. In this work, a simple strategy for simultaneously enhancing the UC luminescence and photocatalytic efficiency of BiOBr:Yb³⁺/Er³⁺ nanoplates through Fe³⁺ ion doping is reported. Compared to the Fe³⁺-free sample, the UC emission intensity was significantly enhanced through tailoring of the crystal symmetry by Fe³⁺ ions. Experiment and DFT calculations reveal that the introduction of Fe³⁺ ions resulted in the formation of an impurity energy level, extending to the light absorption region. As expected, the Fe³⁺-doped BiOBr:Yb³⁺/Er³⁺ nanoplates exhibit a wide photoresponse from the UV to NIR regions, good stability, and obviously enhanced photocatalytic activities compared with the BiOBr:Yb³⁺/Er³⁺ nanoplates in the degradation of RhB. The boosted photocatalytic activity can be attributed to the synergic effect of the efficient utilization of UC luminescence and Fe³⁺ doping, where Fe³⁺ doping could improve the light harvesting capacity, enhance the separation efficiency of electron and hole (e⁻/h⁺) pairs, and promote the production of highly oxidative species. This work not only provides a promising system for the efficient utilization of solar light, but also offers a feasible guideline for the further design of broad-spectrum active photocatalysts.

中文翻译：

Fe ³⁺掺杂的BiOBr：Yb ³⁺ / Er ³⁺上转换纳米板增强的UV-Vis-NIR激活的光催化活性：协同效应和机理研究†

上转换（UC）材料被公认为是收获太阳能进行光催化的有前途的候选材料。在这项工作中，报告了通过Fe ³⁺离子掺杂同时增强BiOBr：Yb ³⁺ / Er ³⁺纳米板的UC发光和光催化效率的简单策略。与不含Fe ^3+的样品相比，通过Fe ³⁺离子的晶体对称性定制，UC发射强度显着提高。实验和DFT计算表明，Fe ³⁺离子的引入导致杂质能级的形成，并延伸到光吸收区域。如所预期的，Fe ³⁺掺杂的BiOBr：Yb ³⁺/ ER ³⁺纳米片与BiOBr相比，从紫外到近红外区域，稳定性好，并显着提高光催化活性表现出广泛的光响应：镱³⁺ / ER ³⁺在罗丹明B的降解纳米片。升压的光催化活性可以归因于UC发光的高效利用和Fe的协同效应³⁺掺杂，其中的Fe ³⁺的掺杂可提高捕光能力，提高电子和空穴（e的分离效率^- / H ⁺）配对，并促进高氧化性物质的产生。这项工作不仅为有效利用太阳光提供了一个有希望的系统，而且为进一步设计广谱活性光催化剂提供了可行的指导。

更新日期：2018-11-14

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