Cu2O-rGO-CuO Composite: An Effective Z-scheme Visible-Light Photocatalyst
Cu2O-rGO-CuO Composite: An Effective Z-scheme Visible-Light Photocatalyst
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Cu2O-rGO-CuO 复合材料：一种有效的 Z 型可见光光催化剂
DOI：
10.2174/1573413711666150130195210
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发表时间：
2015-01-01
影响因子：
1.5
通讯作者：
Yu, Jiaguo
中科院分区：
文献类型：
--
作者：
Wang, Ping;Wang, Jin;Yu, Jiaguo
Z型光催化剂的构建是开发高效可见光复合光催化剂的有效途径。在本研究中，我们设计了一个高效的Z-计划Cu 2 O-rGO-CuO复合光催化剂，通过使用rGO作为固体电子介体。通过简单的两步法合成了Cu 2 O-rGO-CuO复合材料，包括在Cu 2 O-rGO表面接枝rGO和在其表面原位沉积CuO纳米颗粒。结果表明，所制备的Cu 2 O-rGO-CuO光催化剂的光催化活性明显高于单组分（Cu 2 O）或双组分催化剂（如Cu 2 O-rGO和Cu 2 O-CuO）光催化剂，以及Cu 2 O-rGO-CuO（0.5wt%）的光催化活性最高（k = 0.033 min（-1）），明显高于Cu_2 O-rGO（0.014 min（-1））和Cu_2 O-CuO（0.010 min（-1））。根据实验结果和Cu 2 O和CuO的能带结构，提出了Z型Cu 2 O-rGO-CuO光催化体系光催化性能增强的可能机理。在Cu_2 O-rGO-CuO Z-体系中，rGO作为一种新的有效的电子传递体，有效地促进了电子的传递，从而提高了光催化活性。与Au、Ag、Pt等电子介质相比，石墨烯纳米片具有比表面积大、电导率高等优点，可作为理想的固态电子介质用于各种Z型光催化剂的设计和开发。
The construction of Z-scheme photocatalyst has been verified to be an effective route to develop high-efficiency visible-light composite photocatalysts. In this study, we designed a highly efficient Z-scheme Cu2O-rGO-CuO composite photocatalyst by using rGO as a solid electron mediator. The Cu2O-rGO-CuO composites were synthesized via a facile two-step method, including the initial grafting of rGO on the Cu2O surface and then in situ deposition of CuO nanoparticles on the Cu2O-rGO surface. It was found that all the resulted Cu2O-rGO-CuO photocatalysts showed a much higher photocatalytic activity than the single-component (Cu2O) or two-component (such as Cu2O-rGO and Cu2O-CuO) photocatalysts, and the Cu2O-rGO-CuO (0.5 wt%) showed the highest performance (k = 0.033 min(-1)), obviously higher than that of Cu2O-rGO (0.014 min(-1)) and Cu2O-CuO (0.010 min(-1)) photocatalysts. Based on the experimental results and energy band structures of Cu2O and CuO, a possible mechanism of Z-scheme Cu2O-rGO-CuO photocatalytic system was proposed to account for their enhanced photocatalytic performance. The enhanced photocatalytic activity can be ascribed the efficient electron transfer in Cu2O-rGO-CuO Z-scheme system via rGO as a new and effective electron mediator. Compared with the well-known electron mediators such as Au, Ag, and Pt, the present promising graphene nanosheets with large specific surface area and high electroconductivity can be regarded as an ideal solid-state electron mediator for the design and development of various Z-scheme photocatalysts.