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首页> 外文期刊>Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology >Reduced graphene oxide films fabricated by gel coating and their application as platinum-free counter electrodes of highly efficient iodide/triiodide dye-sensitized solar cells
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Reduced graphene oxide films fabricated by gel coating and their application as platinum-free counter electrodes of highly efficient iodide/triiodide dye-sensitized solar cells

机译：通过凝胶涂层制备的氧化石墨烯还原膜及其在高效碘化物/三碘化物染料敏化太阳能电池的无铂对电极中的应用

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摘要

This paper reports the preparation of reduced graphene oxide (rGO) films through the gel formation of rGO with liquid polyethylene glycol (PEG) of low molecular weight and the application of the rGO films as the platinum (Pt)-free counter electrode of highly efficient iodide/triiodide dye-sensitized solar cells (DSCs). rGO prepared through the reduction of graphene oxide can form physical gels with PEG by mechanical grinding. The rGO sheets form 3-dimensional solid networks in the gels. The rGO-PEG gels are processed into rGO films on substrates with good adhesion by doctor blade and subsequent removal of PEG through heating. The rGO films can effectively catalyze the electrochemical reduction of triiodide and are used as the counter electrode of iodide/triiodide DSCs. The optimal photovoltaic efficiency of DSCs with the rGO counter electrode is 7.19% under AM1.5G illumination (100 mW cm~(-2)), which is only slightly lower than that (7.76%) of control DSCs with Pt prepared by pyrolysis as the counter electrode. This is the highest photovoltaic efficiency observed on the DSCs with iodide/ triiodide as the redox couple and graphene as the counter electrode. The rGO films exhibit better stability in catalyzing the electrochemical reduction of triiodide and give rise to better aging stability of DSCs than Pt prepared by pyrolysis. The photovoltaic efficiency of DSCs is strongly dependent on the thickness of the rGO film, and the optimal rGO film thickness is 15 μm. The photovoltaic performance of DSCs is also affected by the method to prepare the rGO-PEG gels. The photovoltaic efficiency is only 6.15% or lower when the rGO-PEG gels are prepared by ultrasonication rather than mechanical grinding. This is attributed to the different morphologies of the rGO films achieved by different methods.
机译：本文报道了通过低分子量液态聚乙二醇（PEG）形成rGO的凝胶形成还原型氧化石墨烯（rGO）膜的方法，以及该rGO膜作为高效无铂（pt）对电极的应用。碘化物/三碘化物染料敏化太阳能电池（DSC）。通过还原氧化石墨烯制备的rGO可以通过机械研磨与PEG形成物理凝胶。 rGO片在凝胶中形成3维固体网络。用刮刀将rGO-PEG凝胶在具有良好附着力的基材上加工成rGO膜，然后通过加热除去PEG。 rGO膜可有效催化三碘化物的电化学还原，并用作碘化物/三碘化物DSC的对电极。使用rGO对电极的DSC在AM1.5G光照（100 mW cm〜（-2））下的最佳光伏效率为7.19％，仅略低于采用热解法制备的Pt的对照DSC的最佳光伏效率（7.76％）。对电极。这是在使用碘化物/三碘化物作为氧化还原对和石墨烯作为对电极的DSC上观察到的最高光伏效率。与通过热解制备的Pt相比，rGO膜在催化三碘化物的电化学还原中表现出更好的稳定性，并导致DSC的更好的老化稳定性。 DSC的光伏效率在很大程度上取决于rGO膜的厚度，最佳rGO膜厚度为15μm。 DSC的光伏性能也受到制备rGO-PEG凝胶的方法的影响。当通过超声而不是机械研磨制备rGO-PEG凝胶时，光伏效率仅为6.15％或更低。这归因于通过不同方法获得的rGO膜的不同形态。

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