Probing the stoichiometry dependent catalytic activity of nickel selenide counter electrodes in the redox reaction of iodide/triiodide electrolyte in dye sensitized solar cells.
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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近年来，硒化镍(NixSey)体系作为潜在的低成本对电极在染料敏化太阳能电池(DSSC)中受到了广泛的关注。它们的电催化活性与传统的铂CE相当。尽管他们取得了成就，但化学计量比对他们作为CES催化性能的影响仍然不清楚，因此这项工作的动机。在合适的合成温度和Ni/Se前驱体比下，用胶体法在油胺或油胺/油酸混合物中合成了不同化学计量比的NixSey。X-射线衍射分析表明，不同化学计量比的硒化镍分别为NiSe_2、Ni3Se_4、Ni0.85Se、NiSe和Ni3Se。扫描电子显微镜显示，所有的化学计量比都具有主要的球形形貌。循环伏安、交流阻抗谱分析和光伏性能测试表明，富硒电池的性能优于富镍电池。结果表明，在常温下，三碘化合物/碘化物电解液对氧化还原反应的催化活性依次为NiSe2>；Ni3Se4>；Ni0.85Se>；NISE>；Ni3Se2分别为3.31%、3.25%、3.17%、2.35%和1.52%。近年来，硒化镍(NixSey)体系作为潜在的低成本对电极在染料敏化太阳能电池(DSSC)中受到了广泛的关注。
Nickel selenide (NixSey) 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 NixSey 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, NiSe2, Ni3Se4, Ni0.85Se, NiSe and Ni3Se2. 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 NixSey 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 NiSe2 > Ni3Se4 > Ni0.85Se > NiSe > Ni3Se2 with PCE values of 3.31%, 3.25%, 3.17%, 2.35% and 1.52% respectively under ambient conditions. Nickel selenide (NixSey) systems have received much attention in recent years as potential low cost counter electrodes (CEs) in dye sensitized solar cells (DSSCs).
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