染料敏化太阳能电池对电极La2Mo2O7复合MWCNTs非Pt催化剂的制备与性能
Synthesis and Performance of La2Mo2O7 with MWCNTs Composite Materials as Pt-Free Counter Electrodes for Dye Sensitized Solar Cells
作者单位E-mail
武克忠 河北师范大学化学与材料科学学院, 河北省无机纳米重点实验室, 石家庄 050024  
赵佳静 河北师范大学化学与材料科学学院, 河北省无机纳米重点实验室, 石家庄 050024  
熊元元 河北师范大学化学与材料科学学院, 河北省无机纳米重点实验室, 石家庄 050024  
阮北 河北师范大学化学与材料科学学院, 河北省无机纳米重点实验室, 石家庄 050024  
武明星 河北师范大学化学与材料科学学院, 河北省无机纳米重点实验室, 石家庄 050024 sc05019017@163.com 
摘要: 通过高温固相法对醋酸镧(C6H9O6La·xH2O)与高钼酸铵((NH46Mo7O24·4H2O)在一定条件下热解制备非Pt催化剂La2Mo2O7(La2O3-2MoO2)。进一步采用2种方法将La2Mo2O7与多壁碳纳米管(MWCNTs)进行复合,一种是将La2Mo2O7喷涂到MWCNTs表层之上得到La2Mo2O7/MWCNTs,另一种是将两者均匀混合掺杂得到La2Mo2O7@MWCNTs,再将上述2种复合材料应用于染料敏化太阳能电池对电极进行相应研究。通过扫描电子显微镜(SEM)表征了复合催化材料的微观形貌,X射线衍射(XRD)确定了微观结构。采用电流密度-光电压曲线、循环伏安,交流阻抗以及塔菲尔极化分析了材料的光电性能。实验结果表明在电解液I3-/I-中,基于La2Mo2O7/MWCNTs与La2Mo2O7@MWCNTs的对电极,相同的条件下在光电池中获得的光电转换效率分别为6.09%和4.84%,明显高于MWCNTs的3.94%和La2Mo2O7的0.87%。电极性能的提高可归因于La2Mo2O7复合催化剂相对大的比表面积和高导电性。
关键词: 染料敏化太阳能电池  能量转换效率  对电极  钼酸铵  复合物
基金项目: 国家自然科学基金(No.21473048,21303039),河北自然科学基金(No.B2015205163,B2016205161),河北省科技厅计划项目(No.16211117)和河北教育厅计划项目(No.QN2017087)资助。
Abstract: A Pt-free counter electrode (CE) composed of La2Mo2O7 (La2O3-2MoO2) was successfully synthesized via the simple pyrolysis of lanthanum acetate (C6H9O6La·xH2O) and hexaammonium heptamolybdate tetrahydrate ((NH4)6Mo7O24·4H2O) in a high-temperature solid-state reaction. Also, La2Mo2O7 and multiwall carbon nanotubes (MWCNTs) are combined using two methods. La2Mo2O7/MWCNTs was prepared by spray-coating La2Mo2O7 over the surface of MWCNTs, and La2Mo2O7@MWCNTs was synthesized by doping La2Mo2O7 into MWCNTs. The two types of composite materials were further used as Pt-free catalytic material in CEs in dye sensitized solar cells (DSSCs). The morphology and microstructure of La2Mo2O7/MWCNTs and La2Mo2O7@MWCNTs were determined using scanning electron microscopy and X-ray diffraction. The electrochemical performance of the La2Mo2O7/MWCNTs and La2Mo2O7@MWCNTs composite catalysts for CEs was determined using photocurrent-voltage measurements, cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel polarization in encapsulation of DSSCs batteries. The experimental results show that power conversion efficiencies of 6.09% and 4.84% were obtained for La2Mo2O7/MWCNTs and La2Mo2O7@MWCNTs, respectively, as CEs toward the reduction of I3-/I- ions, and these values are superior to those of MWCNTs (3.94%) and the La2Mo2O7 (0.87%) electrode under the same conditions. The enhanced electrode performance was attributed to the relatively larger surface area and higher conductivity of the La2Mo2O7/MWCNTs composite catalysts.
Keywords: dye-sensitized solar cell  power conversion efficiency  counter electrode  molybdenum acid lanthanum  composite material
投稿时间:2018-03-21 修订日期:2018-09-01
摘要点击次数:  67
全文下载次数:  45
武克忠,赵佳静,熊元元,阮北,武明星.染料敏化太阳能电池对电极La2Mo2O7复合MWCNTs非Pt催化剂的制备与性能[J].无机化学学报,2018,34(11):2041-2048.
查看全文  查看/发表评论  下载PDF阅读器
Support information: