One-step solvothermal tailoring the compositions and phases of nickel cobalt sulfides on conducting oxide substrates as counter electrodes for efficient dye-sensitized solar cells
One-step solvothermal tailoring the compositions and phases of nickel cobalt sulfides on conducting oxide substrates as counter electrodes for efficient dye-sensitized solar cells
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DOI：
10.1016/j.apsusc.2016.08.177
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发表时间：
2016-12
影响因子：
6.7
通讯作者：
N. Huang;Guowang Li;Huan Huang;Panpan Sun;Tianli Xiong;Zhifen Xia;F. Zheng;Jixing Xu;Xiaohua Su
中科院分区：
文献类型：
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作者：
N. Huang;Guowang Li;Huan Huang;Panpan Sun;Tianli Xiong;Zhifen Xia;F. Zheng;Jixing Xu;Xiaohua Su
制备了几种镍钴硫化物 (Ni-Co-S) 对电极 (CE)，并通过简单的溶剂热工艺在 SnO2:F (FTO) 透明导电玻璃上原位生长 Ni-Co-S 纳米颗粒，其中硫脲用作硫化剂。采用 X 射线衍射、扫描电子显微镜和能谱仪测量 Ni-Co-S CE 的微观结构和成分。当采用适量的硫脲时，可得到细晶NiCo2S4CE。当硫脲用量少或多时，分别得到(Ni,Co)4S3或(Ni,Co)3S4CE。循环伏安法、电化学阻抗谱、塔菲尔极化和开路电压衰减（OCVD）测量均表明这些Ni-Co-S CE的电催化活性和电导率均接近或超过Pt热解CE。通过使用 Ni-Co-S CE 制造 DSSC 进一步证实了它们优越的电化学性能，它们表现出与 Pt 热解对应物相似或更好的光电转换效率。
Several nickel cobalt sulfide (Ni-Co-S) counter electrodes (CEs) are prepared, and the Ni-Co-S nanoparticles are in-situ grown on SnO2: F (FTO) transparent conductive glasses via a facile solvothermal process, in which thiourea is used as the sulfurizing reagent. The X-ray diffraction, scanning electron microscopy, and energy dispersive spectrometer are employed to measure the microstructure and composition of the Ni-Co-S CEs. When a proper amount of thiourea is adopted, fine crystalline NiCo2S4CE is obtained. When the amount of thiourea is small or large, (Ni,Co)4S3or (Ni,Co)3S4CE is acquired, respectively. Cyclic voltammetry, electrochemical impedance spectroscopy, Tafel polarization and open-circuit voltage decay (OCVD) measurements all demonstrate that the electrocatalytic activities and electrical conductivities of these Ni-Co-S CEs all approach or exceed those of Pt-pyrolysis CE. Their superior electrochemical performances are further confirmed by fabricating DSSCs with the Ni-Co-S CEs, they display similar or better photo-electric conversion efficiencies to/than the Pt-pyrolysis counterpart.