CoS Acicular Nanorod Arrays for the Counter Electrode of an Efficient Dye-Sensitized Solar Cell
CoS Acicular Nanorod Arrays for the Counter Electrode of an Efficient Dye-Sensitized Solar Cell
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DOI：
10.1021/nn302063s
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发表时间：
2012-08-01
期刊：
影响因子：
17.1
通讯作者：
Ho, Kuo-Chuan
中科院分区：
文献类型：
--
作者：
Kung, Chung-Wei;Chen, Hsin-Wei;Ho, Kuo-Chuan
采用两步法在掺氟氧化锡（FTO）衬底上制备了一维硫化钴（CoS）针状纳米棒阵列（ANRA）。首先，Co 3 O 4 ANRA的合成，然后他们被转化为CoS ANRA的不同时期。通过X射线衍射、紫外-可见分光光度法和X射线光电子能谱对不同转化期后所得薄膜的组成进行了验证;通过扫描电子显微镜和透射电子显微镜图像对不同转化期的薄膜形貌进行了研究。通过循环伏安法（CV）和Tafel极化曲线验证了薄膜对I-/I-3（-）的电催化能力。用循环伏安法研究了薄膜在I-/I-3（-）电解液中的长期稳定性。将具有CoS ANRA的FTO衬底用作染料敏化太阳能电池的对电极;对于具有CoS ANRA的电池，在100 mW/cm（2）下实现了7.67%的最大功率转换效率，这与具有溅射Pt对电极的电池（7.70%）几乎相同。电化学阻抗谱被用来证实光伏参数。
One-dimensional cobalt sulfide (CoS) acicular nanorod arrays (ANRAs) were obtained on a fluorine-doped tin oxide (FTO) substrate by a two-step approach. First, Co3O4 ANRAs were synthesized, and then they were converted to CoS ANRAs for various periods. The compositions of the films obtained after various conversion periods were verified by X-ray diffraction, UV-visible spectrophotometry, and X-ray photoelectron spectroscopy; their morphologies were examined at different periods by scanning electron microscopic and transmission electron microscopic images. Electrocatalytic abilities of the films toward I-/I-3(-) were verified through cyclic voltammetry (CV) and Tafel polarization curves. Long-term stability of the films in I-/I-3(-) electrolyte was studied by CV. The FTO substrates with CoS ANRAs were used as the counter electrodes for dye-sensitized solar cells; a maximum power conversion efficiency of 7.67% was achieved for a cell with CoS ANRAs, under 100 mW/cm(2), which is nearly the same as that of a cell with a sputtered Pt counter electrode (7.70%). Electrochemical impedance spectroscopy was used to substantiate the photovoltaic parameters.