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首页> 外文期刊>Journal of power sources >High-efficiency layered sulfur-doped reduced graphene oxide and carbon nanotube composite counter electrode for quantum dot sensitized solar cells
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High-efficiency layered sulfur-doped reduced graphene oxide and carbon nanotube composite counter electrode for quantum dot sensitized solar cells

机译：用于量子点敏化太阳能电池的高效分层硫掺杂还原氧化石墨烯和碳纳米管复合对电极

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摘要

A high-efficiency layered sulfur-doped reduced graphene oxide and carbon nanotube composite counter electrode for quantum dot sensitized solar cells is prepared via ultrasonic dispersion followed with simultaneous reduction and doping by hydrothermal using Na2S as a reductant and sulfur source. Scanning and Transmission electron microscopy show the layered composite with carbon nanotube-bridges between reduced graphene sheets. An increase in sp(2)C/sp(3)C ratio of composite is revealed for the first time by the analysis of X-ray photoelectron spectra. Electrochemical tests show that the charge transfer resistance is 1.76 Omega. The power conversion efficiency of 5.70% is obtained for the quantum dot sensitized solar cell based the composite counter electrode, and is 18.26%, 76.47%, and 126.19% higher than those of unsulfured composite, reduced graphene, and carbon nanotube counter electrodes, respectively. This is mainly due to the improvement of morphological and property of sulfur-doped reduced graphene and carbon nanotube composite, which presents a high specific surface area, high conductivity, providing abundant catalytic active sites and fast electron transport channels for S-n(2-) reduction.
机译：通过超声分散制备高效层状掺杂硫的还原氧化石墨烯和碳纳米管复合对电极，方法是通过超声分散，然后同时使用Na2S作为还原剂和硫源进行水热还原和掺杂。扫描和透射电子显微镜显示层状复合材料在还原的石墨烯片之间具有碳纳米管桥。通过X射线光电子能谱分析首次揭示了复合材料的sp（2）C / sp（3）C比值的增加。电化学测试表明，电荷转移电阻为1.76Ω。对于基于复合复合电极的量子点敏化太阳能电池，其功率转换效率为5.70％，分别比未硫化复合复合电极，还原石墨烯和碳纳米管复合电极高18.26％，76.47％和126.19％。 。这主要归因于掺杂硫的还原石墨烯和碳纳米管复合材料的形态和性能的改善，该复合材料具有高比表面积，高电导率，提供丰富的催化活性位和快速的电子传输通道以还原Sn（2-）。 。

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