Deposition-precipitation synthesis of Yb3+/Er3+ co-doped BiOBr/AgBr heterojunction photocatalysts with enhanced photocatalytic activity under Vis/NIR light irradiation
Deposition-precipitation synthesis of Yb3+/Er3+ co-doped BiOBr/AgBr heterojunction photocatalysts with enhanced photocatalytic activity under Vis/NIR light irradiation
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DOI：
10.1016/j.seppur.2019.116450
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发表时间：
2020-05
影响因子：
8.6
通讯作者：
Shuhui Liang;Dafeng Zhang;Xintong Yao;Ruoting Han;Qidi Zhang;Chuanyu Jin;Xipeng Pu;Y. Geng
中科院分区：
文献类型：
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作者：
Shuhui Liang;Dafeng Zhang;Xintong Yao;Ruoting Han;Qidi Zhang;Chuanyu Jin;Xipeng Pu;Y. Geng
采用沉积-沉淀法成功制备了BiOBr：Yb 3+，Er 3 +/AgBr（BYE/AgBr）异质结光催化剂。采用XRD、EDS、SEM、TEM、XPS、DRS和PL等测试手段对复合材料进行了表征。由于Er 3+的上转换跃迁，BYE/AgBr复合材料表现出很强的近红外光吸收和从近红外光到紫外-可见光的上转换发光。由于BYE和AgBr的合适能带结构，形成了异质结，显著提高了电子-空穴对的分离率。在维斯/近红外光照射下，与纯BYE和AgBr相比，BYE/AgBr样品的光活性明显提高，这可能是由于Er 3+的上转换效应和异质结的形成。这一结果提供了一个有前途的系统，有效地收获的可见-近红外光，这将有助于利用太阳能在未来。
BiOBr:Yb3+,Er3+/AgBr (BYE/AgBr) heterojunction photocatalysts were successfully synthesized by a deposition-precipitation method. The characteristic of the as-obtained composites were tested by XRD, EDS, SEM, TEM, XPS, DRS and PL. As-obtained BYE/AgBr composites exhibit strong NIR light absorption and upconversion emission from NIR to UV–Vis due to the upconversion transition of Er3+. The heterojunction was constructed due to the appropriate band structures of BYE and AgBr, which distinctly improves the separation rate of electron-hole pairs. Compared with pure BYE and AgBr, as-synthesized BYE/AgBr samples exhibit distinctly improved photoactivities under the irradiation of Vis/NIR light, which can be attributed to the upconversion effect of Er3+and the construction of heterojunction. This result provides a promising system for efficient harvest of the Vis-NIR light, which will contribute to the utilization of solar energy in the future.