Fabrication of strawberry-like nano-CdSe thin films for photoelectrochemistry by selenizing Cd(OH)(2) deposits obtained from the anodization of Cd
Fabrication of strawberry-like nano-CdSe thin films for photoelectrochemistry by selenizing Cd(OH)(2) deposits obtained from the anodization of Cd
复制标题
通过硒化 Cd 阳极氧化获得的 Cd(OH)(2) 沉积物制备用于光电化学的草莓状纳米 CdSe 薄膜
DOI：
10.1007/s10008-016-3383-4
复制
发表时间：
2017
影响因子：
2.5
通讯作者：
Li Zelin
中科院分区：
文献类型：
--
作者：
Xie Yun;Wang Liyan;Liu Peng;Xia Yue;Huang Wei;Li Zelin
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 KNO3at −0.9 V (vs. Hg|Hg2SO4(s)|K2SO4(saturated)) into a porous and layered structure covered with Cd(OH)2precipitation, and then selenized the Cd(OH)2deposited 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)2into 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−2at −0.3 V with good stability under visible light illumination of 100 mW cm−2in a solution containing a sacrificial reagent of ascorbic acid.Graphical AbstractStrawberry-like CdSe nanoaggregates were prepared by selenizing the anodization film of Cd(OH)2on Cd electrode and they demonstrated enhanced photoelectrochemical performance.
