Potapenko Ksenia O, Kurenkova Anna Yu, Bukhtiyarov Andrey V, Gerasimov Evgeny Yu, Cherepanova Svetlana V, Kozlova Ekaterina A
Federal Research Center Boreskov Institute of Catalysis SB RAS, Lavrentieva Ave., 5, 630090 Novosibirsk, Russia.
Nanomaterials (Basel). 2021 Feb 1;11(2):355. doi: 10.3390/nano11020355.
A series of solid solutions of cadmium and manganese sulfides, CdMnS (x = 0-0.35), and composite photocatalysts, CdS-β-MnO-MnOOH, were synthesized by precipitation with sodium sulfide from soluble cadmium and manganese salts with further hydrothermal treatment at 120 °C. The obtained photocatalysts were studied by the X-ray diffraction method (XRD), UV-vis diffuse reflectance spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and N low temperature adsorption. The photocatalysts were tested in hydrogen production using a NaS/NaSO aqueous solution under visible light (λ = 450 nm). It was shown for the first time that both kinds of photocatalysts possess high activity in hydrogen evolution under visible light. The solid solution CdMnS has an enhanced photocatalytic activity due to its valence and conduction band position tuning, whereas the CdS-β-MnO-MnOOH (40-60 at% Mn) samples were active due to ternary heterojunction formation. Further, the composite CdS-β-MnO-MnOOH photocatalyst had much higher stability in comparison to the CdMnS solid solution. The highest activity was 600 mmol g h, and apparent quantum efficiency of 2.9% (λ = 450 nm) was possessed by the sample of CdS-β-MnO-MnOOH (40 at% Mn).
通过用硫化钠从可溶性镉盐和锰盐中沉淀，并在120℃下进一步进行水热处理，合成了一系列镉和锰的硫化物固溶体CdMnS（x = 0 - 0.35）以及复合光催化剂CdS-β-MnO-MnOOH。通过X射线衍射法（XRD）、紫外可见漫反射光谱、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和N低温吸附对所得光催化剂进行了研究。在可见光（λ = 450 nm）下，使用NaS/NaSO水溶液对光催化剂进行产氢测试。首次表明这两种光催化剂在可见光下析氢均具有高活性。固溶体CdMnS由于其价带和导带位置的调整而具有增强的光催化活性，而CdS-β-MnO-MnOOH（40 - 60原子% Mn）样品由于形成三元异质结而具有活性。此外，复合CdS-β-MnO-MnOOH光催化剂与CdMnS固溶体相比具有更高的稳定性。CdS-β-MnO-MnOOH（40原子% Mn）样品的最高活性为600 mmol g h，表观量子效率为2.9%（λ = 450 nm）。
