Design of sandwich-structured ZnO/ZnS/Au photoanode for enhanced efficiency of photoelectrochemical water splitting

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• 作者：Yichong Liu ; Yousong Gu ; Xiaoqin Yan ; Zhuo Kang ; Shengnan Lu ; Yihui Sun…
• 关键词：ZnO ; ZnS ; Au ; photoanode ; photoelectrochemical water splitting
• 刊名：Nano Research
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：8
• 期：9
• 页码：2891-2900
• 全文大小：2,271 KB
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• 作者单位：Yichong Liu (1)
  Yousong Gu (1)
  Xiaoqin Yan (1)
  Zhuo Kang (1)
  Shengnan Lu (1)
  Yihui Sun (1)
  Yue Zhang (1) (2)
  
  1. State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
  2. Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000

文摘

We developed and demonstrated a ZnO/ZnS/Au composite photoanode with significantly enhanced photoelectrochemical water-splitting performance, containing a ZnS interlayer and Au nanoparticles. The solar-to-hydrogen conversion efficiency of this ZnO/ZnS/Au heterostructure reached 0.21%, 3.5 times that of pristine ZnO. The comparison of the incident photon-to-current efficiency (IPCE) and the photoresponse in the white and visible light regions further verified that the enhancement resulted from contributions of both UV and visible light. The modification of the Au NPs was shown to improve the photoelectrochemical (PEC) performance to both UV and visible light, as modification encouraged effective surface passivation and surface-plasmonresonance effects. The ZnS interlayer favored the movement of photogenerated electrons under UV light and hot electrons under visible light, causing their injection into ZnO; this simultaneously suppressed the electron-hole recombination at the photoanode-electrolyte interface. The optimized design of the interlayer within plasmonic metal/semiconductor composite systems, as reported here, provided a facile and compatible photoelectrode configuration, enhancing the utilization efficiency of incident light for photoelectrochemical applications.