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首页> 外文期刊>RSC Advances >Probing the stoichiometry dependent catalytic activity of nickel selenide counter electrodes in the redox reaction of iodide/triiodide electrolyte in dye sensitized solar cells
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Probing the stoichiometry dependent catalytic activity of nickel selenide counter electrodes in the redox reaction of iodide/triiodide electrolyte in dye sensitized solar cells

机译：探讨染料氧化荧光氧化钠/三碘化物电解质氧化还原反应中镍硒代计数电极的化学计量依赖性催化活性

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Nickel selenide (Ni _( x ) Se _( y ) ) systems have received much attention in recent years as potential low cost counter electrodes (CEs) in dye sensitized solar cells (DSSCs). Their electrocatalytic activities are comparable to that of the conventional platinum CE. Despite their achievements, the effect of stoichiometry on their catalytic performance as CEs in DSSCs still remains unclear, hence the motivation for this work. Different stoichiometries of Ni _( x ) Se _( y ) were synthesized via a colloidal method in oleylamine or oleylamine/oleic acid mixture at the appropriate synthetic temperature and Ni to Se precursor ratio. X-ray diffraction revealed that different stoichiometries of nickel selenide were formed namely, NiSe _(2) , Ni _(3) Se _(4) , Ni _(0.85) Se, NiSe and Ni _(3) Se _(2) . Scanning electron microscopy showed that all the stoichiometries had predominantly spherical-like morphologies. Cyclic voltammetry, electrochemical impedance spectroscopy analysis and the photovoltaic performances of the DSSCs fabricated using the different Ni _( x ) Se _( y ) CEs revealed that selenium rich stoichiometries performed better than the nickel rich ones. Consequently, the catalytic activity towards the redox reaction of the triiodide/iodide electrolyte and hence the power conversion efficiency (PCE) followed the order of NiSe _(2) > Ni _(3) Se _(4) > Ni _(0.85) Se > NiSe > Ni _(3) Se _(2) with PCE values of 3.31%, 3.25%, 3.17%, 2.35% and 1.52% respectively under ambient conditions.
机译：镍硒（Ni _（x）SE _（y））系统近年来接受了很多关注，因为染料敏化太阳能电池（DSSCs）的潜在低成本计数器电极（CES）。它们的电催化活性与传统铂Ce的电气催化活动相当。尽管他们的成就，但化学计量在DSSCS中CES催化性能的影响仍然尚不清楚，因此该工作的动机。通过在适当的合成温度和Ni至Se前体比下通过胶体方法在油胺或油胺/油酸混合物中通过胶体方法合成Ni _（X）Se _（Y）的不同的化学测定物。 X射线衍射表明，形成镍硒化物的不同化学测定剂，即NISE _（2），Ni _（3）Se _（4），Ni _（0.85）Se，NiS和Ni _（3）SE _（2 ）。扫描电子显微镜表明，所有的化学测定仪主要是球形的形态。循环伏安法，电化学阻抗光谱分析和使用不同Ni _（x）Se _（Y）CES制造的DSSCs的光伏性能显示，富含镍富含镍的化学物质表现优于富含镍的体育型。因此，趋向于三碘化物/碘化物电解质的氧化还原反应的催化活性，因此电源转换效率（PCE）之后的NISE _（2）> Ni _（3）SE _（4）> Ni _（0.85） SE> NIS> NI _（3）SE _（2）PCE值分别在环境条件下分别为3.31％，3.25％，3.17％，2.35％和1.52％。

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