Fabrication of strawberry-like nano-CdSe thin films for photoelectrochemistry by selenizing Cd(OH)₂ deposits obtained from the anodization of Cd

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• 作者：Yun Xie ; Liyan Wang ; Peng Liu ; Yue Xia…
• 关键词：Thin film ; Aggregated CdSe nanoparticles ; Anodization ; Semiconductor ; Photoelectrochemistry
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：21
• 期：2
• 页码：477-483
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Electrochemistry; Energy Storage; Characterization and Evaluation of Materials; Analytical Chemistry; Condensed Matter Physics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1433-0768
• 卷排序：21

文摘

CdSe is an important semiconductor for photoelectrochemistry. Here, we propose a two-step method for preparing thin films of aggregated CdSe nanoparticles on Cd electrodes. We first anodized the Cd electrode in an aqueous solution of 0.2 M KNO₃ at −0.9 V (vs. Hg|Hg₂SO₄(s)|K₂SO₄ (saturated)) into a porous and layered structure covered with Cd(OH)₂ precipitation, and then selenized the Cd(OH)₂ deposited on the Cd anode in an aqueous solution of 0.2 M Na₂SeSO₃. The resulting CdSe nanoparticles self-assembled into strawberry-like nanoaggregates. The anodization time and selenization time were optimized separately. Under our experimental conditions, the optimized anodization time was 80 s, whereas the optimized selenization time ranged from 15 to 60 min, corresponding to the partial or complete conversion of the deposited Cd(OH)₂ into smaller and larger strawberry-like CdSe nanoaggregates, respectively. The optimized partially and completely selenized films showed photocurrent responses that were enhanced in different ways but demonstrated comparable performances. They presented an anodic photocurrent density as high as 3.2 mA cm−2 at −0.3 V with good stability under visible light illumination of 100 mW cm−2 in a solution containing a sacrificial reagent of ascorbic acid.