Citation: WU Ke-Zhong, ZHAO Jia-Jing, XIONG Yuan-Yuan, RUAN Bei, WU Ming-Xing. Synthesis and Performance of La₂Mo₂O₇ with MWCNTs Composite Materials as Pt-Free Counter Electrodes for Dye Sensitized Solar Cells[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(11): 2041-2048. doi: 10.11862/CJIC.2018.249 shu

Synthesis and Performance of La₂Mo₂O₇ with MWCNTs Composite Materials as Pt-Free Counter Electrodes for Dye Sensitized Solar Cells

Key Laboratory of Inorganic Nano-Materials of Hebei Province, Department of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, China

Corresponding author: WU Ming-Xing, sc05019017@163.com
Received Date: 21 March 2018
Revised Date: 1 September 2018

Figures(7)

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.
- dye-sensitized solar cell,
- power conversion efficiency,
- counter electrode,
- molybdenum acid lanthanum,
- composite material
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通讯作者: 陈斌, bchen63@163.com

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Synthesis and Performance of La2Mo2O7 with MWCNTs Composite Materials as Pt-Free Counter Electrodes for Dye Sensitized Solar Cells

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通讯作者: 陈斌, bchen63@163.com

Synthesis and Performance of La₂Mo₂O₇ with MWCNTs Composite Materials as Pt-Free Counter Electrodes for Dye Sensitized Solar Cells