Polyoxometalate-Derived Multi-Component X/W2C@X,N-C (X=Co,Si, Ge,B, and P) Nanoelectrocatalysts for Efficient Triiodide Reduction in Dye-Sensitized Solar Cells |
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| Authors: | Ting Wang Ming Xu Prof Weilin Chen Xiaohong Li Fengrui Li Prof Xinlong Wang Prof Yunwu Li Ding Liu Prof Enbo Wang |
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| Institution: | 1. Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Changchun, Jilin, 130024 P. R. China
These authors contributed equally to this work.;2. Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Changchun, Jilin, 130024 P. R. China;3. Shandong Provincial Key Laboratory of Chemical Energy Storage, and Novel Cell Technology, School of Chemical Engineering, Liaocheng University, Liaocheng, Shandong, 252059 P. R. China |
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| Abstract: | Multi-component tungsten carbide-based hybrid materials featuring different heteroatom dopants coated with X,N dual-doped carbon layers (X/W2C@X,N-C, XWXNC) were prepared by selecting Keggin-type polyoxometalates (POMs) (NH4)nXW12O40] (X=Co, Si, Ge, B, and P) and dicyandiamide (DCA) as precursors. The electrocatalytic activity of these nanocomposites as counter electrode (CE) catalysts for dye-sensitized solar cells (DSSCs) was systematically investigated. Structure characterizations show that X,N heteroatoms were successfully introduced into the W2C and carbon frameworks. The obtained X,N dual-doped carbon layers were modified and loaded with W2C nanoparticles, promoting the improvement of catalytic performance by a synergistic effect. The consequence of photoelectric conversion efficiency (PCE) is CoWCoNC (6.68 %)>SiWSiNC (6.56 %)>GeWGeNC (6.49 %)>BWBNC (6.45 %)>PWPNC (6.20 %)>WNC (6.05 %). With the increase in electronegativity of the dopants, the photovoltaic performance decreases in a reverse order. This work provides a shortcut to the rational design of highly efficient and cost-effective catalysts for DSSCs. |
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| Keywords: | doping nanocomposites polyoxometalates solar cells tungsten carbide |
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