Novel PtCo alloy nanoparticle decorated 2D g-C3N4 nanosheets with enhanced photocatalytic activity for H2 evolution under visible light irradiation
Novel PtCo alloy nanoparticle decorated 2D g-C3N4 nanosheets with enhanced photocatalytic activity for H2 evolution under visible light irradiation
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DOI：
10.1039/c5ta05370f
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发表时间：
2015-01-01
影响因子：
11.9
通讯作者：
Fang, Siman
中科院分区：
文献类型：
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作者：
Han, Changcun;Lu, Yan;Fang, Siman
采用原位化学沉积法制备了PtCo纳米合金修饰的二维石墨氮化碳（g-C3 N4）光催化剂。采用X射线衍射（XRD）、紫外-可见漫反射光谱（DRS）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和表面光电压谱（SPV）对PtCo/g-C3 N4样品的物理化学性能进行了表征。光催化析氢实验表明，PtCo合金助催化剂能有效提高g-C3 N4光生载流子的分离效率，从而提高析氢活性。1.0 wt% PtCo/g-C3 N4纳米片催化剂显示出最高的催化活性，相应的H-2析出速率为960 μ mol h（-1）g（-1），与原始本体Pt/g-C3 N4石墨（330 μ mol h（-1）g（-1））相比，在可见光照射下提高了2.9倍。光催化剂在光照28 h后仍能保持稳定和催化活性。提出了PtCo纳米粒子增强可见光性能的可能机理，为进一步改进其他功能材料提供了指导。
Novel two-dimensional (2D) graphitic carbon nitride (g-C3N4) photocatalysts decorated with PtCo bimetallic alloy nanoparticles (NPs) were prepared via an in situ chemical deposition method. The physical and chemical properties of the as-prepared PtCo/g-C3N4 samples were characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and surface photovoltage spectroscopy (SPV). The photocatalytic H-2 evolution experiments indicate that the PtCo alloy co-catalyst can effectively promote the separation efficiency of photo-generated charge carriers in g-C3N4, and consequently enhance the H-2 evolution activity. The 1.0 wt% PtCo/g-C3N4 nanosheet catalyst shows the highest catalytic activity, and the corresponding H-2 evolution rate is 960 mu mol h(-1) g(-1), which is enhanced 2.9 times compared to that of pristine bulk Pt/g-C3N4 graphitic(330 mu mol h(-1) g(-1)) under visible light irradiation. The photocatalyst can keep stable and maintain catalytic activity after irradiation for 28 h. A possible photocatalytic mechanism of PtCo NPs on the enhancement of visible light performance is proposed to guide further improvement of other desirable functional materials.