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Direct Z-scheme CdS-CdS Nanorod Arrays Photoanode: Synthesis, Characterization and Photoelectrochemical Performance
Yi Fan1, Zhi-min Song2, Jing-jing Dong1, Zhi-yu Wang1, Yue Yang1, Xiao-di Zhu1, Song Sun2, Chen Gao*1,3, Jun Bao*1
1.National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei 230029, China;2.School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China;3.Beijing Advanced Sciences and Innovation center, Chinese Academy of Sciences, Beijing 100029, China
Abstract:
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 a regular hexagonal prism with 100-200 nm in diameter. The calcination temperature and time were optimized carefully to achieve the highest photoelectrochemical performance. The as-fabricated hybrid system achieved a photocurrent density up to 6.5 mA/cm2 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 those previously reported similar systems. A direct Z-scheme photocatalytic mechanism was proposed based on the structure and photoelectrochemical performance characterization results, which can well explain the high separation efficiency of photoinduced carriers and the excellent redox ability.
Key words:  Direct Z-scheme, CdO-CdS, One-Dimensional nanorod arrays, PEC performance, H2 evolution rate
FundProject:
直接Z型CdO-CdS纳米棒阵列的制备及其光电催化性能研究
樊 奕1, 宋治敏2, 董晶晶1, 王徵羽1, 杨 越1, 朱晓娣1, 孙 松2, 高 琛*1,3, 鲍 骏*1
1.中国科学技术大学国家同步辐射实验室,能源材料化学协同创新中心,安徽省高等学校表面与界面化学与能源催化重点实验室,合肥 230029;2.安徽大学化学化工学院,合肥 230601;3.中国科学院北京高等科学与创新中心,北京 101407
摘要:
本文通过简单的水热法制备了一种CdO-CdS一维纳米棒阵列,并系统地研究了材料的结构、形貌及其光电化学性质和产氢活性. 所得纳米棒为直径100至200 nm的六方柱. 通过优化煅烧温度和时间得到了该实验条件下光电催化性能最优的样品. 在0 V vs. Ag/AgCl偏压下,CdO-CdS光电流密度为6.5 mA/cm2,光电催化产氢活性为240 μmol·cm-2·h-1,几乎是纯CdS的2倍. 该体系的光电催化性能超过了许多已报道的相似体系. 根据材料结构和光电化学性能表征结果,提出了直接z型光催化机理,该机理可以很好地解释光致载流子的高分离效率和优异的氧化还原性能.
关键词:  直接Z型结构,CdO-CdS,一维纳米棒阵列,光电催化,产氢速率
DOI:10.1063/1674-0068/cjcp1905090
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