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Enhanced Photoelectrochemical Performance over a Direct Z-scheme CdO-CdS 1-Dimensional Nanorod Arrays
ChenGao
Author NameAffiliationE-mail
ChenGao National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui 230029, China cgao@ustc.edu.cn 
Abstract:
A direct Z-scheme CdO-CdS 1-dimensional nanorod arrays were constructed through a facile and simple hydrothermal process. The structure, morphology, photoelectrochemical properties and H2 evolution activity of this catalyst were investigated systematically. The morphology of the obtained nanorod is regular hexagonal prism with 100-200 nm in diameter. The calcination temperature and time were optimized carefully to achieve the highest PEC performance. The as-fabricated hybrid system achieved a photocurrent density up to 6.5 mA?cm-2 and H2 evolution rate of 240 μmol?cm-2?h-1 at 0 V vs. Ag/AgCl, which is about 2-fold higher than that of the bare CdS nanorod arrays. The PEC performance exceeds previously reported similar systems. A direct Z-scheme photocatalytic mechanism was proposed based on the structure and photoelectrochemical performance characterizations results, which can well explain the high separation efficiency of photoinduced carriers and excellent redox ability.
Key words:  direct Z-scheme, CdO-CdS, 1-dimensional nanorod arrays, PEC performance, H2 evolution rate
FundProject:
Enhanced Photoelectrochemical Performance over a Direct Z-scheme CdO-CdS 1-Dimensional Nanorod Arrays
高琛
摘要:
A direct Z-scheme CdO-CdS 1-dimensional nanorod arrays were constructed through a facile and simple hydrothermal process. The structure, morphology, photoelectrochemical properties and H2 evolution activity of this catalyst were investigated systematically. The morphology of the obtained nanorod is regular hexagonal prism with 100-200 nm in diameter. The calcination temperature and time were optimized carefully to achieve the highest PEC performance. The as-fabricated hybrid system achieved a photocurrent density up to 6.5 mA?cm-2 and H2 evolution rate of 240 μmol?cm-2?h-1 at 0 V vs. Ag/AgCl, which is about 2-fold higher than that of the bare CdS nanorod arrays. The PEC performance exceeds previously reported similar systems. A direct Z-scheme photocatalytic mechanism was proposed based on the structure and photoelectrochemical performance characterizations results, which can well explain the high separation efficiency of photoinduced carriers and excellent redox ability.
关键词:  direct Z-scheme, CdO-CdS, 1-dimensional nanorod arrays, PEC performance, H2 evolution rate
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