Efficient photocatalytic hydrogen evolution over graphdiyne boosted with a cobalt sulfide formed S-scheme heterojunction

光催化 材料科学 X射线光电子能谱 光致发光 拉曼光谱 制氢 催化作用 碳纤维 分解水 光催化分解水 石墨烯 异质结 硫化钴 可见光谱 化学工程 纳米技术 物理化学 电化学 复合数 化学 光电子学 有机化学 复合材料 光学 物理 工程类 电极
作者
Zhiliang Jin,Hongying Li,Junke Li
出处
期刊:Chinese Journal of Catalysis [Elsevier BV]
卷期号:43 (2): 303-315 被引量:265
标识
DOI:10.1016/s1872-2067(21)63818-4
摘要

Graphdiyne (GDY, g-CnH2n–2), a novel two-dimensional carbon hybrid material, has attracted significant attention owing to its unique and excellent properties. As a new type of carbon material, GDY has a layered structure and can be used in the field of photocatalytic water splitting. Therefore, herein, new progress in the preparation of graphene using CuI powder as a catalytic material and the combination of a facile hydrothermal method to prepare a new composite material, Co9S8-GDY-CuI, is reported. The hydrogen production activity of Co9S8-GDY-CuI in the sensitization system reached 1411.82 μmol g–1 h–1, which is 10.29 times that of pure GDY. A series of characterization techniques were used to provide evidence for the successful preparation of the material and its superior photocatalytic activity. Raman spectroscopy showed that the material contains acetylenic bonds, and the X-ray photoelectron spectroscopy carbon fitting peaks indicated the presence of C–C(sp2) and C–C(sp), further demonstrating that GDY was successfully prepared. A possible reaction mechanism was proposed by making use of UV-visible diffuse reflectance and Mott-Schottky analyses. The results showed that a double S-scheme heterojunction was constructed between the samples, which effectively accelerated the separation and transfer of electrons. In addition, the introduction of Co9S8 nanoparticles greatly improved the visible light absorption capacity of Co9S8-GDY-CuI. Photoluminescence spectroscopy and related electrochemical characterization further proved that recombination of the electron-hole pairs in the composite material was effectively suppressed.
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