Li Tongtong, Tao Ran, Wang Yanxin, Yan Ting, Fan Xiaoxing, Liu Kuiyong
School of Physics, Liaoning University, Shenyang 110036, PR China.
School of Physics, Liaoning University, Shenyang 110036, PR China; Liaoning Key Laboratory of Semiconductor Light Emitting and Photocatalytic Materials, Liaoning University, Shenyang 110036, PR China.
J Colloid Interface Sci. 2024 Feb;655:841-851. doi: 10.1016/j.jcis.2023.11.014. Epub 2023 Nov 10.
The conversion of carbon dioxide (CO) into value-added syngas represents an effective approach for addressing both environmental issues and carbon neutrality issue. However, the slow charge dynamics and low CO affinity severely limit the photocatalytic CO reduction reaction. In this study, bismuth oxide iodide (BiOI)/zinc titanium oxide (ZnTiO) composite nanofibers were successfully prepared by immobilizing BiOI nanosheets on ZnTiO electrospun nanofibers through a solvothermal reaction method. The results of photocatalytic research indicate that the BiOI/ZnTiO composite nanofibers exhibit improved photocatalytic activity in CO reduction compared to pristine BiOI nanosheets and ZnTiO nanofibers. The highest carbon monoxide (CO) release rate of BiOI/ZnTiO nanofibers could reach 9.10 µmol‧g‧h, which is 18.6 times and 6.6 times higher than that of pristine BiOI nanosheets and ZnTiO nanofibers, respectively. The enhanced photocatalytic activity can be credited to the formed BiOI/ZnTiO p-n heterojunction, which can boost electron separation, reduce charge recombination at the interface, and promote the reaction process. The presence of oxygen vacancies in BiOI/ZnTiO nanofibers can not only provide active site to facilitate the adsorption and activation of CO molecules, but also adjust the energy band structure of the catalyst to accelerate carriers transfer. After four cycles of testing, the CO release rate of BiOI/ZnTiO nanofibers remains nearly constant, demonstrating its excellent stability. This work develops a feasible strategy to improve the efficiency of photoreduction of CO through energy band engineering and surface defect technology.
将二氧化碳（CO₂）转化为增值合成气是解决环境问题和碳中和问题的有效途径。然而，缓慢的电荷动力学和低CO₂亲和力严重限制了光催化CO₂还原反应。在本研究中，通过溶剂热反应法将BiOI纳米片固定在ZnTiO电纺纳米纤维上，成功制备了氧化铋碘（BiOI）/锌钛氧化物（ZnTiO）复合纳米纤维。光催化研究结果表明，与原始的BiOI纳米片和ZnTiO纳米纤维相比，BiOI/ZnTiO复合纳米纤维在CO₂还原中表现出更高的光催化活性。BiOI/ZnTiO纳米纤维的最高一氧化碳（CO）释放速率可达9.10 μmol‧g‧h，分别是原始BiOI纳米片和ZnTiO纳米纤维的18.6倍和6.6倍。光催化活性的增强归因于形成的BiOI/ZnTiO p-n异质结，它可以促进电子分离，减少界面处的电荷复合，并促进反应过程。BiOI/ZnTiO纳米纤维中氧空位的存在不仅可以提供活性位点以促进CO分子的吸附和活化，还可以调节催化剂的能带结构以加速载流子转移。经过四个循环测试后，BiOI/ZnTiO纳米纤维的CO释放速率几乎保持不变，表明其具有优异的稳定性。这项工作通过能带工程和表面缺陷技术开发了一种提高CO₂光还原效率的可行策略。
