Improved performance in dye-sensitized solar cells via controlling crystalline structure of nickel selenide
Improved performance in dye-sensitized solar cells via controlling crystalline structure of nickel selenide
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通过控制硒化镍的晶体结构提高染料敏化太阳能电池的性能
DOI：
10.1007/s10853-018-2065-2
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发表时间：
2018-05-01
影响因子：
4.5
通讯作者：
Zhang, Yulin
中科院分区：
文献类型：
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作者：
Jiang, Qingsong;Chen, Ruoting;Zhang, Yulin
单相结构的硒化镍作为染料敏化太阳能电池的对电极纳米材料已经得到了广泛的研究。然而，对于杂化结构的硒化镍，其晶体结构对电催化活性的影响机理还有待进一步探讨和分析。因此，本文采用简单的溶剂热法合成了NiSe/NiSe2杂化纳米材料。通过在掺氟氧化锡玻璃上喷涂NiSe/NiSe2杂化纳米材料，构建了NiSe/NiSe2对电极。NiSe/NiSe2对电极的纳米杂化结构由于控制了NiSe3的晶体结构，表现出更多的催化活性中心、较强的电荷分离和转移三碘的能力。因此，电化学测试结果表明，优化后的NiSe/NiSe2对电极的电催化活性高于铂电极。结果表明，采用优化后的NiSe/NiSe2对电极制备的DSC的光电转换效率为7.78%，高于基于铂电极的DSC的光电转换效率(7.09%)。我们的研究工作为设计和制造DSCs的硒化镍对电极提供了依据。
Nickel selenide with the single-phase structure has been widely studied as counterelectrode nanomaterials for dye-sensitized solar cells (DSCs). However, the effect mechanism of the crystalline structure on the electrocatalytic activity is still needed to be explored and analyzed in nickel selenide with hybrid structure. Therefore, NiSe/NiSe2hybrid nanomaterials are synthesized via a simple solvothermal approach in this work. NiSe/NiSe2counterelectrodes are constructed by spraying NiSe/NiSe2hybrid nanomaterials onto fluorine-doped tin oxide glass. The hybrid nanostructure of NiSe/NiSe2counterelectrodes exhibits the more catalytic active sites, strong charge separation, and transfer ability for the reduction of triiodide owing to the well-controlled crystalline structure of nickel selenide. Therefore, the results from electrochemical measurements prove that the electrocatalytic activity of the optimized NiSe/NiSe2counterelectrode is higher than that of platinum electrode. As a result, the DSC with the optimized NiSe/NiSe2counterelectrode yields a remarkable photoelectrical conversion efficiency of 7.78%, which is larger than that of the DSC based on platinum electrode (7.09%). Our research work provides the insight into design and construct of nickel selenide counterelectrodes of DSCs.