Synthesis of La2MoO6@MWCNTs composite catalysts as Pt-free counter electrodes for dye-sensitized solar cell
来源期刊：Journal of Rare Earths2018年第12期
论文作者：Kezhong Wu Jiajing Zhao Yuanyuan Xiong Bei Ruan Mingxing Wu
文章页码：1278 - 1283
摘 要：Pt-free counter electrode（CE） composed of La2 MoO6（La2 O3-MoO3） was successfully synthesized by simple pyrolysis of lanthanum acetate（C6 H9 O6 La·xH2 O） and hexaammonium heptamolybdate tetrahydrate(（NH4）6 Mo7 O24·4 H2 O). Furthermore,three proportions composites catalysts of La2 MoO6@MWCNTs based on La2 MoO6 and multiwall carbon nanotubes（MWCNTs） were prepared and characterized as Ptfree catalyst for CE in dye-sensitized solar cells（DSSCs）. The morphology and structure of La2 MoO6@MWCNTs composites were determined by scanning electron microscopy, transmission electron microscope and X-ray diffraction. The electrochemical performance of La2 MoO6@MWCNTs composite catalysts for CEs was determined by photocurrent-voltage measurements, cyclic voltammetry,electrochemical impedance spectroscopy, and Tafel polarization. The power conversion efficiencies of4.68%, 4.87% and 5.06% are obtained for La2 MoO6:MWCNTs with the mass ratios of 5:1, 3:1 and 1:1 towards the reduction of I3-to I-under the same conditions,respectively,which are superior to those of MWCNTs（3,94%） and La2 MoO6（1.71%） electrodes. The experimental results reveal that the presence of MWCNTs results in an augmented active catalytic surface area and enhanced charge transfer from CE to the electrolyte.
Kezhong Wu，Jiajing Zhao，Yuanyuan Xiong，Bei Ruan，Mingxing Wu
Key Laboratory of Inorganic Nano-materials of Hebei Province, Department of Chemistry and Material Science, Hebei Normal University
摘 要：Pt-free counter electrode（CE） composed of La2 MoO6（La2 O3-MoO3） was successfully synthesized by simple pyrolysis of lanthanum acetate（C6 H9 O6 La·xH2 O） and hexaammonium heptamolybdate tetrahydrate(（NH4）6 Mo7 O24·4 H2 O). Furthermore,three proportions composites catalysts of La2 MoO6@MWCNTs based on La2 MoO6 and multiwall carbon nanotubes（MWCNTs） were prepared and characterized as Ptfree catalyst for CE in dye-sensitized solar cells（DSSCs）. The morphology and structure of La2 MoO6@MWCNTs composites were determined by scanning electron microscopy, transmission electron microscope and X-ray diffraction. The electrochemical performance of La2 MoO6@MWCNTs composite catalysts for CEs was determined by photocurrent-voltage measurements, cyclic voltammetry,electrochemical impedance spectroscopy, and Tafel polarization. The power conversion efficiencies of4.68%, 4.87% and 5.06% are obtained for La2 MoO6:MWCNTs with the mass ratios of 5:1, 3:1 and 1:1 towards the reduction of I3-to I-under the same conditions,respectively,which are superior to those of MWCNTs（3,94%） and La2 MoO6（1.71%） electrodes. The experimental results reveal that the presence of MWCNTs results in an augmented active catalytic surface area and enhanced charge transfer from CE to the electrolyte.
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