CoS制备方法研究及在染料敏化电池中应用

通过简单的气-固反应法在氟掺杂的氧化锡导电玻璃(FTO)上成功制备了CoS对电极,并通过优化工艺,进一步确认了制备CoS的最佳浓度。通过扫面电子显微镜(SEM)、X射线衍射(XRD)、拉曼光谱、X射线光电子能谱(XPS)、电化学阻抗谱(EIS)、循环伏安测试(CV)、Tafel极化曲线以及光电流密度-电压特性曲线(J-V)分别研究了其表面形貌、物质结构、电催化性能和光电性能。结果表明20%浓度制备的CoS对电极具有较高的电催化活性,在一个标准太阳光照条件下(100mW.cm_-2),其光电转换效率(PCE)是7.81%,短路电流密度(J_sc)是17.3 mA.cm_?2,开路电压(V_oc)是0.74 V,填充因子(FF)是0.61,显示出与Pt对电极(7.97%)相比拟的性能。说明通过这种气-固反应法采用浓度为20%醋酸钴溶液制备的CoS薄膜具有高催化性、低成本的优点,可代替Pt作为染料敏化电池对电极。、关键词用黑体,及关键词内容用宋体。

Study on Preparation of CoS Used as Counter Electrode for Dye-sensitized Solar Cells

Cobalt sulfide (CoS) counter electrode was successfully prepared by a simple solid-gas reaction method on the conductive glass of fluorine doped tin oxide in dye-sensitized solar cells. The optimal concentration of CoS was further confirmed by optimizing the process. The surface morphology, material structure, electrocatalytic and photovoltaic performances were characterized by scanning electron microscopy (SEM), X ray diffraction (XRD), Raman spectroscopy, X ray photoelectron spectroscopy, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), Tafel polarization curves and photoelectric current density voltage characteristic curves (J-V). The result showed that CoS prepared by 20% concentration had higher electrocatalytic activity as a counter electrode (CE). Under standard illumination of one sun (100mW.cm_-2), the dye-sensitized solar cell (DSSCS) incorporating CoS-decorated FTO glass substrate as a CE provide a power conversion efficiency (PCE) of 7.81% with a short-circuit current (J_SC) of 17.3 mA.cm_?2, an open-circuit voltage (V_OC) of 0.74V, and a fill factor (FF) of 0.61, which are comparable with the values obtained for the device with a Pt-based counter electrode (PCE:7.97%). The results indicate that CoS film prepared by 20% concentration deposited by the solid-gas reaction approach exhibits high catalyst ability and low cost, which can replace Pt as a counter electrode for dye-sensitized solar cells..