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虫号: 3290608
注册: 2014-06-24
性别: MM
专业: 碳素材料与超硬材料

[交流] 石墨烯基RuO2纳米复合材料作为高效的催化剂用于染料敏化太阳能电池中碘化物的还原已有1人参与

Graphene based RuO2 nanohybrid as a highly efﬁcient catalyst for triiodide reduction in dye sensitized solar cells，CARBON 81 (2015) 710-719. 影响因子：6.16
摘要：This study is the ﬁrst to report the synthesis of graphene based RuO2 nanohybrid materials and their application as a counter electrode (CE) in dye sensitized solar cells (DSCs). Ru nanoparticles (RuNPs) with an average size of 9 nm were uniformly immobilized on the surface of reduced graphene oxide (RGO) with the simultaneous co reduction of Ru precursor ions and graphene oxide (GO) to Ru atoms and RGO, respectively, through dry plasma reduction (DPR) under atmospheric pressure and at near room temperature without using any toxic chemicals. Since RuNPs are more susceptible to oxidation, Ru atoms located on the surface of RuNPs are further oxidized to RuO2 in atmosphere. The resulting RuO2 RGO nanohybrid with a very small amount of Ru exhibits low charge transfer resistance, low diffusion impedance and good long term stability. The application of RuO2 RGO nanohybrid as an alternative CE for DSCs leads to high energy conversion efﬁciency of 8.32 ± 0.15%, which is comparable to the value of 8.16 ± 0.13% of DSCs based on a Pt NP CE prepared by DPR. This study also discusses the inﬂuence of hydrogen species existing in either precursor ions or graphenes on the formation of uniform and well dispersed NPs on the substrates.
中文翻译摘要：本研究首先报道了石墨烯基RuO2纳米复合材料的合成和应用作为染料敏化太阳能电池（DSC）的对电极（CE）。平均粒径在9nm的Ru纳米颗粒（RuNPs）均匀的涂覆在还原的氧化石墨烯表面（RGO），同时将Ru前驱体离子和氧化石墨烯还原成Ru原子和RGO，在常压和室温条件下通过干式等离子还原没有用到任何有毒的化学品。因为RuNPs容易氧化，位于RuNPs表面的Ru原子在空气中进一步氧化成RuO2。合成的RuO2-RGO纳米复合材料具有非常少量的Ru，呈现出低的电荷转移阻力、低扩散阻抗和好的长期稳定性。 RuO2-RGO纳米复合材料作为DSCs中可选择的CE的应用导致高的能量转换效率8.32±0.15%，比得上基于Pt-NP通过DPR制备的CE的DSCs8.16±0.13%。本研究也讨论了存在于前驱体离子或是石墨烯中氢原子的种类对基板上均匀的、良好分散性的NPs的影响。
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