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Ag nanoparticles encapsulated in mixed-valence NH2-MIL-101(FeII/III) for high-efficiency photocatalytic N2 fixation
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.jallcom.2024.178212 Huifang Feng, Tao Lv, Qiaozhen Xu, Hong Liu
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.jallcom.2024.178212 Huifang Feng, Tao Lv, Qiaozhen Xu, Hong Liu
To improve the photocatalytic efficiency of N2 fixation to produce NH3, herein, Ag nanoparticles (NPs) encapsulated NH2-MIL-101(FeII/III) with mixed-valence was fabricated. A higher oxygen vacancy concentration was observed in NH2-MIL-101(FeII/III) compared to NH2-MIL-101(Fe). The Schottky junction between NH2-MIL-101(FeII/III) and Ag NPs effectively promoted the migration and separation of the photogenerated carriers, while the localized surface plasmon resonance effect of Ag NPs enhanced the light absorption and facilitated the generation of hot electrons. Consequently, the resulting Ag@NH2-MIL-101(FeII/III) delivered an excellent photocatalytic N2 fixation activity with high stability. The optimal ammonia yield of Ag@NH2-MIL-101(FeII/III) under visible light was 244.6 µmol g-1 h-1, 1.9 and 3.2 folds that of NH2-MIL-101(FeII/III) and NH2-MIL-101(Fe), receptivity. Finally, with the aid of in situ infrared spectrometry, the intermediate products and reaction pathway were investigated.
中文翻译:
包埋在混合价 NH2-MIL-101(FeII/III) 中的 Ag 纳米颗粒用于高效光催化 N2 固定
为了提高 N2 固定产生 NH3 的光催化效率,本文制备了具有混合价的 Ag 纳米颗粒 (NPs) 包封的 NH 2-MIL-101(FeII/III)。与 NH 2-MIL-101 (Fe) 相比,NH2-MIL-101 (FeII/III) 观察到更高的氧空位浓度。NH 2-MIL-101(Fe II/III) 和 Ag NPs 之间的肖特基结有效促进了光生载流子的迁移和分离,而 Ag NPs 的局域表面等离子体共振效应增强了光吸收并促进了热电子的产生。因此,所得的 Ag@NH 2-MIL-101(FeII/III) 具有优异的光催化 N2 固定活性,稳定性高。在可见光下,Ag@NH 2-MIL-101 (FeII/III) 的最佳氨产率为 244.6 μmol g-1 h-1,分别是 NH2-MIL-101 (FeII/III) 和 NH2-MIL-101 (Fe) 的 1.9 倍和 3.2 倍。最后,借助原位红外光谱技术,研究了中间产物和反应途径。
更新日期:2024-12-19
中文翻译:
包埋在混合价 NH2-MIL-101(FeII/III) 中的 Ag 纳米颗粒用于高效光催化 N2 固定
为了提高 N2 固定产生 NH3 的光催化效率,本文制备了具有混合价的 Ag 纳米颗粒 (NPs) 包封的 NH 2-MIL-101(FeII/III)。与 NH 2-MIL-101 (Fe) 相比,NH2-MIL-101 (FeII/III) 观察到更高的氧空位浓度。NH 2-MIL-101(Fe II/III) 和 Ag NPs 之间的肖特基结有效促进了光生载流子的迁移和分离,而 Ag NPs 的局域表面等离子体共振效应增强了光吸收并促进了热电子的产生。因此,所得的 Ag@NH 2-MIL-101(FeII/III) 具有优异的光催化 N2 固定活性,稳定性高。在可见光下,Ag@NH 2-MIL-101 (FeII/III) 的最佳氨产率为 244.6 μmol g-1 h-1,分别是 NH2-MIL-101 (FeII/III) 和 NH2-MIL-101 (Fe) 的 1.9 倍和 3.2 倍。最后,借助原位红外光谱技术,研究了中间产物和反应途径。