Abstract
MoC/MnO composite materials have been easily synthesized via a two-step hydrothermal and one-step carbonization method and used as counter electrode catalysts in DSSCs for the first time. The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). And their electrocatalytic properties were also thoroughly studied by electrochemical impedance spectroscopy (EIS), Tafel polarization and so on. It is found that the electrocatalytic properties of the MoC/MnO CEs can be greatly enhanced. After optimizing the molar ratio of MoO3 precursor and KMnO4, the as-obtained MoC/MnO-0.25 CE has superior electrocatalytic ability, low charge transfer resistance and high incident photon-to-current conversion efficiency (IPCE). And the power conversion efficiency of the DSSC based on the MoC/MnO-0.25 CE is up to 8.00%, better than that of the DSSC used standard Pt CE (7.36%) in the same test environment, meanwhile the MoC/MnO-0.25 CE also has good electrochemical stability in the iodine-based electrolyte, which shows a promising candidate to replace Pt for DSSCs.
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Acknowledgements
This work was financially supported by National Key R&D Program of China (2017YFA0403503), National Natural Science Foundation of China (11674001), Anhui Provincial Natural Science Foundation (1708085MA07, 1708085QE116), Science Foundation of Anhui Education (No. KJ2013A030), Open Fund for Discipline Construction (S01003103), Institute of Physical Science and Information Technology (Anhui University), the Doctoral research start-up funds projects of Anhui University (J01003206), the Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure (SKL201607SIC), and in part by the National Natural Science Foundation of China (11174002).
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Peng, A., Gao, Y., Yang, Q. et al. MoC/MnO composite materials as high efficient and stable counter electrode catalysts for dye-sensitized solar cells. J Mater Sci: Mater Electron 31, 1976–1985 (2020). https://doi.org/10.1007/s10854-019-02717-8
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DOI: https://doi.org/10.1007/s10854-019-02717-8