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Simultaneous Morphology and Band Structure Manipulation of BiOBr by Te Doping for Enhanced Photocatalytic Oxygen Evolution
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-12-13 , DOI: 10.1021/acsami.3c13687 Jia Song 1 , Yunfei Ma 2 , Qitao Zhang 2 , Chaohua Zhang 1 , Xuelian Wu 1, 3
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-12-13 , DOI: 10.1021/acsami.3c13687 Jia Song 1 , Yunfei Ma 2 , Qitao Zhang 2 , Chaohua Zhang 1 , Xuelian Wu 1, 3
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The photocatalytic oxygen evolution of bismuth oxybromide (BiOBr) is greatly hindered by its low visible-light response and high electron–hole recombination. Nonmetal doping can effectively alleviate these issues, leading to improvement in photocatalytic performance. Herein, Bi2Te3 was introduced as both the Te doping source and the morphology-control template to improve the photocatalytic performance of BiOBr. Appropriate amounts of Te are critical to maintain the ultrathin plate-like structure of BiOBr, whereas excessive Te results in the formation of a flower-like architecture. Oxygen evolution activity disclosed that a plate-like structure is essential for realizing higher performance owing to sufficient light utilization and efficient charge separation. An optimal oxygen evolution rate of 368.0 μmol h–1 g–1 was achieved for the Te-doped sample, which is 2.3-fold as that of the undoped BiOBr (158.9 μmol h–1 g–1). Theoretical calculations demonstrated that Te doping can induce impurity levels above the valence band of BiOBr, which slightly narrowed the band gap and strengthened the light absorption in the range of 400–800 nm. More importantly, Te dopants could act as shallow traps for confining the excited electrons, thus prolonging the carrier lifetime. This work provides a novel strategy to prepare highly efficient photocatalysts by simultaneously realizing morphology manipulation and nonmetal doping.
中文翻译：
通过 Te 掺杂同时调控 BiOBr 的形貌和能带结构以增强光催化析氧能力
溴氧化铋（BiOBr）的低可见光响应和高电子空穴复合极大地阻碍了光催化析氧。非金属掺杂可以有效缓解这些问题，从而提高光催化性能。在此，引入Bi 2 Te 3作为Te掺杂源和形貌控制模板，以提高BiOBr的光催化性能。适量的 Te 对于维持 BiOBr 的超薄板状结构至关重要，而过量的 Te 会导致形成花状结构。析氧活性表明，由于充分的光利用和有效的电荷分离，板状结构对于实现更高的性能至关重要。 Te掺杂样品的最佳析氧速率为368.0 μmol h –1 g –1 ，是未掺杂BiOBr（158.9 μmol h –1 g –1 ）的2.3倍。理论计算表明，Te掺杂可以在BiOBr的价带上方产生杂质水平，从而略微缩小带隙并增强400-800 nm范围内的光吸收。更重要的是，Te掺杂剂可以充当浅陷阱来限制激发的电子，从而延长载流子寿命。这项工作提供了一种通过同时实现形貌操控和非金属掺杂来制备高效光催化剂的新策略。
更新日期：2023-12-13
中文翻译：
通过 Te 掺杂同时调控 BiOBr 的形貌和能带结构以增强光催化析氧能力
溴氧化铋（BiOBr）的低可见光响应和高电子空穴复合极大地阻碍了光催化析氧。非金属掺杂可以有效缓解这些问题，从而提高光催化性能。在此，引入Bi 2 Te 3作为Te掺杂源和形貌控制模板，以提高BiOBr的光催化性能。适量的 Te 对于维持 BiOBr 的超薄板状结构至关重要，而过量的 Te 会导致形成花状结构。析氧活性表明，由于充分的光利用和有效的电荷分离，板状结构对于实现更高的性能至关重要。 Te掺杂样品的最佳析氧速率为368.0 μmol h –1 g –1 ，是未掺杂BiOBr（158.9 μmol h –1 g –1 ）的2.3倍。理论计算表明，Te掺杂可以在BiOBr的价带上方产生杂质水平，从而略微缩小带隙并增强400-800 nm范围内的光吸收。更重要的是，Te掺杂剂可以充当浅陷阱来限制激发的电子，从而延长载流子寿命。这项工作提供了一种通过同时实现形貌操控和非金属掺杂来制备高效光催化剂的新策略。
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