Towards full-spectrum photocatalysis： Achieving a Z-scheme between Ag2S and TiO2 by engineering energy band alignment with interfacial Ag  

作　　者：Yanrui Li Leilei Li Yunqi Gong Song Bai Huanxin Ju Chengming Wang Qian Xu Junfa Zhu Jun Jiang Yujie Xiong 

机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), School of Chemistry and Materials Science, and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China

出　　处：《Nano Research》2015年第11期3621-3629,共9页纳米研究（英文版）

基　　金：Acknowledgements This work was financially supported by the National Basic Research Program of China （973 Program） （No. 2014CB848900）, National Natural Science Foundation of China （NSFC） （Nos. 21471141 and 21473166）, Recruitment Program of Global Experts, Hundred Talent Program of CAS, and the Fundamental Research Funds for the Central Universities （Nos. WK2060190025, WK2310000035, and WK2090050027）. Photoemission spectroscopy experiments were performed at the Catalysis and Surface Physics Endstation at the BL11U beamline in the National Synchrotron Radiation Laboratory （NSRL） in Hefei, China.

摘　　要：A Z-scheme is a promising approach to achieve broad-spectrum photocatalysis. Integration of TiO2 with another semiconductor with a band gap of -1.0 eV would be ideal to harvest both ultraviolet and visible-near infrared light for photocatalysis; however, most narrow-bandgap semiconductors have straddling band structure alignments with TiO2, constituting an obstacle to forming the Z-scheme for photocatalytic hydrogen production. In this communication, we demonstrate Ag2S as a model system where the energy band upshift of the narrow-bandgap semiconductor that shares an interface with a metal can overcome this limitation. To fabricate the design, we developed a unique approach to synthesize Ag2S-Ag-TiO2 hybrid structures. The obtained ternary hybrid structures exhibited dramatically enhanced performance in photocatalytic hydrogen pro- duction under full-spectrum light illumination. The activities were significantly higher than the sum of those of Ag2S-Ag-TiO2 structures under λ〈 400 nm and λ 〉 400 nm irradiation as well as those of their counterparts under any light illumination conditions.Z 计划是一条有希望的途径完成用途广泛的光催化。有有 1.0 eV 的乐队差距的另一个半导体的 TiO ₂ 的集成将对紫外的收获和在可见附近理想为光催化的红外线的光；然而，大多数 narrow-bandgap 半导体让与组成一个障碍到为 photocatalytic 氢生产形成 Z 计划的 TiO ₂, 跨骑乐队结构排列。在这通讯，我们表明 Ag <sub>2</sub > 是的 S 在哪儿的一个模型系统精力乐队分享一个接口，一个金属罐头克服的 narrow-bandgap 半导体换高速档这限制。制作设计，我们开发了一条唯一的途径综合 Ag <sub>2</sub > SAgTiO ₂ 混血儿结构。戏剧性地展出的获得的第三的混合结构在完整光谱的轻照明下面在 photocatalytic 氢生产提高了性能。这些活动比 Ag <sub>2</sub 的那些的和显著地高 > SAgTiO ₂ 结构在下面 < 400 nm 并且 > 他们在任何轻照明下面的对应物的象那些一样的 400 nm 照耀调节。

关 键 词：PHOTOCATALYSIS Z-scheme semiconductor band structure water splitting 

分 类 号：TN248.4[电子电信—物理电子学] O643.36[理学—物理化学]