Fe 掺杂 FexBi2-xO3 中的表面双金属占据诱导高效光催化 CO2 还原,ACS Applied Materials & Interfaces

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Fe 掺杂 FexBi2-xO3 中的表面双金属占据诱导高效光催化 CO2 还原
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-05-10 , DOI: 10.1021/acsami.3c02784
Shaoqi Zhang ₁ , Haiyang Yu ₁ , Yi Wang ₁ , Yuxiang Yan ₁ , Jun Dai ₂ , Dajun Shu ₁ , Xinglong Wu ₁

Affiliation

CO ₂具有非凡的热力学稳定性，其还原反应涉及多个电子转移过程。因此，催化剂表面的高密度电子占据是提高光催化活性的有效驱动力。在这里，我们报告了使用溶剂热法制备具有不同 Fe 含量的 Fe 掺杂 Bi ₂ O ₃催化剂（表示为 Fe _x Bi _{2- x} O _{3 ）。}自组装催化剂具有纳米花状形态，其将CO ₂还原成CO的性能在很大程度上取决于Fe含量的提高。在 Fe 含量为 7.0% 的样品中 (Fe _0.07 Bi _1.93O ₃），CO释放速率达到30.06 μmol g ^–1 h ^–1 ，比原始Bi ₂ O ₃的4.95 μmol g ^–1 h ^–1高约6倍，并且在三个循环后表现出优异的光稳定性，与每个循环持续7小时。理论计算和光谱表征表明，这种良好的 CO ₂还原反应性能源于Fe的有效表面占据，这不仅增强了阳光吸收，而且显着增加了双金属活性位点上的表面电子密度。这项工作为通过在某些金属氧化物光催化剂中进行表面金属掺杂来提高光催化性能提供了一种新策略。

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Surface Dual Metal Occupations in Fe-Doped FexBi2-xO3 Induce Highly Efficient Photocatalytic CO2 Reduction

CO₂ possesses extraordinary thermodynamic stability, and its reduction reaction involves multiple electron-transfer processes. Thus, high-density electron occupation on a catalyst surface is an effective driving force for improving the photocatalytic activity. Here, we report on the fabrication of Fe-doped Bi₂O₃ catalysts (denoted as Fe_xBi_2-xO₃) with different Fe contents using the solvothermal method. The self-assembled catalyst has a nanoflower-like morphology, and its performance of CO₂ reduction to CO is improved largely dependent on the Fe content. In the sample with a 7.0% Fe content (Fe_0.07Bi_1.93O₃), the CO evolution rate reaches 30.06 μmol g^–1 h^–1, which is about 6 times higher than the 4.95 μmol g^–1 h^–1 of pristine Bi₂O₃, and shows excellent photostability after three cycles, with each cycle lasting for 7 h. Theoretical calculation and spectral characterization reveal that such a good CO₂ reduction reaction performance arises from effective surface occupation of Fe, which not only enhances sunlight absorption but also significantly increases the surface electron density on the double metal active sites. This work provides a new strategy for improving the photocatalytic performance by surface metal doping in some metal oxide photocatalysts.

更新日期：2023-05-10

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