钼酸锌-碳复合材料在染料敏化太阳能电池对电极中的应用

doi:10.15541/jim20140156

无机材料学报 ›› 2014, Vol. 29 ›› Issue (11): 1133-1138.DOI: 10.15541/jim20140156 CSTR: 32189.14.10.15541/jim20140156

钼酸锌-碳复合材料在染料敏化太阳能电池对电极中的应用

唐蓓蓓¹, 郭明星¹, 姜维¹, 尹淑慧², 张曼霞¹, 王亮³, 张艺鸣¹, 郑磊¹, 孟悦琦¹

(1. 大连海事大学环境科学与工程学院, 大连 116026; 2. 大连海事大学物理系, 大连 116026; 3. 大连理工大学精细化工国家重点实验室, 大连 116012)

收稿日期:2014-03-31 修回日期:2014-05-20 出版日期:2014-11-20 网络出版日期:2014-10-24
作者简介:唐蓓蓓(1989–), 女, 硕士研究生. E-mail: wstbb1314d@163.com
基金资助:
国家自然科学基金(11204022);中央高校基本科研业务费专项基金(2012QN066, 3132014099)

Zinc Molybdate-carbon Composites as Counter Electrode Materials for Dye-sensitized Solar Cells

TANG Bei-Bei¹, GUO Ming-Xing¹, JIANG Wei¹, YIN Shu-Hui², ZHANG Man-Xia¹, WANG Liang³, ZHANG Yi-Ming¹, ZHENG Lei¹, MENG Yue-Qi¹

(1. School of Environment Science and Engineering, Dalian Maritime University, Dalian 116026, China; 2. Department of Physics, Dalian Maritime University, Dalian 116026, China; 3. State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China)

Received:2014-03-31 Revised:2014-05-20 Published:2014-11-20 Online:2014-10-24
About author:TANG Bei-Bei. E-mail: wstbb1314d@163.com
Supported by:
National Natural Science Foundation of China(11204022);Fundamental Research Funds for the Central Universities, China(2012QN066, 3132014099)

摘要/Abstract

摘要：

采用水热合成法制备出片状结构钼酸锌, 并以其为原料, 添加石墨(G)或导电碳(Cc), 利用喷涂法分别制备出ZnMoO₄、ZnMoO₄-G和ZnMoO₄-Cc对电极催化材料, 应用于染料敏化太阳能电池(DSCs)中。实验结果表明: 以ZnMoO₄为对电极材料的DSC光电转换效率为4.19%, 在分别添加石墨及导电碳制备成复合对电极材料后, 其相应的光电转换效率分别提高到6.56%及7.36%。其中, ZnMoO₄-Cc对电极与相同条件下铂对电极的光电转换效率(7.81%)相当。电化学阻抗(EIS), 循环伏安法(CV)及Tafel极化曲线测试结果表明, ZnMoO₄、ZnMoO₄-G和ZnMoO₄-Cc三种材料均具有一定的导电性和电催化性能。

关键词: 染料敏化太阳能电池, 水热合成, 钼酸锌, 光电性能, 电催化性

Abstract:

Sheet-like structured zinc molybdate (ZnMoO₄) was firstly synthesized by hydrothermal method. Then, graphite (G) and conductive carbon (Cc) modified ZnMoO₄ (denoted as ZnMoO₄-G and ZnMoO₄-Cc) were fabricated by dispersing ZnMoO₄ into graphite (G) and conductive carbon (Cc) solutions, respectively. The obtained ZnMoO₄-G and ZnMoO₄-Cc composites were used as electrocatalysts for dye-sensitized solar cells (DSCs), exhibiting promising potential as counter electrode materials. The experimental results demonstrated that the DSC assembled with sole ZnMoO₄ showed an overall light conversion efficiency of 4.19%, while the DSCs made of ZnMoO₄-G and ZnMoO₄-Cc counter electrodes displayed power conversion efficiencies of 6.56% and 7.36%, respectively. The solar cell performance obtained by ZnMoO₄-Cc counter electrode was comparable to Pt-based DSCs (7.81%). Various characterization techniques, such as electrochemical impedance spectra (EIS), cyclic voltammetry (CV) and Tafel polarization curve, were employed to evaluate the electrocatalytic activity of all investigated materials. Among all investigated counter electrodes, the high solar cell performance obtained by ZnMoO₄-Cc counter electrode could be attributed to superior electrical conductivity of conductive carbon material and excellent electrocatalytic activity of sheet-like structured ZnMoO₄-Cc.

Key words: dye-sensitized solar cell, hydrothermal synthesis, ZnMoO4, photovoltaic performance, electric catalytic

中图分类号:

O643

唐蓓蓓, 郭明星, 姜维, 尹淑慧, 张曼霞, 王亮, 张艺鸣, 郑磊, 孟悦琦. 钼酸锌-碳复合材料在染料敏化太阳能电池对电极中的应用[J]. 无机材料学报, 2014, 29(11): 1133-1138.

TANG Bei-Bei, GUO Ming-Xing, JIANG Wei, YIN Shu-Hui, ZHANG Man-Xia, WANG Liang, ZHANG Yi-Ming, ZHENG Lei, MENG Yue-Qi. Zinc Molybdate-carbon Composites as Counter Electrode Materials for Dye-sensitized Solar Cells[J]. Journal of Inorganic Materials, 2014, 29(11): 1133-1138.

图/表 8

图 1 ZnMoO4的扫描电镜照片

Fig. 1 SEM images of ZnMoO4

图 2 ZnMoO4粉末的XRD图谱和对应照片

Fig. 2 XRD patterns and photo (inset) of ZnMoO4 powders

图 3 不同材料对电极组装的DSCs的电流-电压曲线

Fig. 3 Photocurrent-voltage curves of DSCs using different materials as counter electrodes

图 4 不同材料对电极组装的对称电池的Nyquist 阻抗图

Fig. 4 Nyquist plots of the dummy cell fabricated with two identical electrode for different counter electrodes

表1 不同材料对电极组装的DSCs的光伏性能及相应的EIS参数

Table 1 Photovoltaic performance of DSCs with different counter electrodes and EIS parameters of the dummy cell assembled with two identical counter electrodes

Sample	V_oc/V	J_sc/(mA·cm^-2)	FF	η/%	R_s/(Ω·cm²)	R_ct/(Ω·cm²)	Z_N/(Ω·cm²)	E_pp/V
ZnMoO₄	0.64	13.20	0.50	4.19	15.77	2.85	6.31	0.361
ZnMoO₄-G	0.67	16.58	0.59	6.56	15.20	1.99	4.67	0.138
ZnMoO₄-Cc	0.70	16.79	0.63	7.36	13.32	1.46	1.89	0.124
Pt	0.73	18.94	0.55	7.81	8.66	0.96	0.19	0.120

图 5 (a)ZnMoO4、(b)ZnMoO4-G和(c)ZnMoO4-Cc的SEM照片

Fig. 5 SEM images of (a) ZnMoO4, (b) ZnMoO4-G and (c) ZnMoO4-Cc

图 6 不同对电极的CV曲线

Fig. 6 Cyclic voltammograms of different CEs

图 7 不同对电极的Tafel曲线

Fig. 7 Tafel curves of the dummy cell fabricated with two identical electrode for different counter electrodes

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钼酸锌-碳复合材料在染料敏化太阳能电池对电极中的应用

Zinc Molybdate-carbon Composites as Counter Electrode Materials for Dye-sensitized Solar Cells

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