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《第三届新型太阳能电池学术研讨会论文集》2016年
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Earth-abundant and nano-micro composite catalysts of Fe_3O_4@reduced graphene oxide for green and economical mesoscopic photovoltaic devices with high efficiencies up to 9%

周华伟  尹杰  乜忠浩  张宪玺  马廷丽  
【摘要】:The ideal liquid-solid heterogeneous electrocatalysis should have not only high catalytic activity but also free electron transport.However,preparing a single catalysts that simultaneously possesses both advantages has proven to be challenging.Herein,we prepared nano-micro composite catalysts(NMCC) composed of highly dispersed Fe_3O_4 nanoparticles fixed on reduced graphene oxide(RGO) sheets(namely,Fe_3O_4@RGO-NMCC) as counter electrode(CE) in dye-sensitized solar cells(DSCs).Compared with Fe_3O_4 or RGO CE,Fe_3O_4@RGO-NMCC CE exhibited improved activity and reversibility for the catalytic reduction of triiodide ions(I_3~-) into iodide ions(I-).Notably,DSCs using rigid and flexible Fe_3O_4@RGO-NMCC CEs achieved high PCEs up to 9% and 8% on fluorine-doped tin oxide(FTO)/glass substrates and flexible polymer substrates,respectively.These values are,to our knowledge,one of the highest reported efficiencies for DSCs based on a flexible Pt-free CE.We ascribed the superior catalytic performance of Fe_3O_4@RGO-NMCC to faster electron hopping between Fe~(2+) and Fe~(3+) and free electron transport by broad RGO sheets.Finally,Fe_3O_4@RGO-NMCC exhibited good stability in practical application of DSCs because Fe_3O_4 nanoparticles were chemically bonded to the surface of RGO.Our work here will be great interest for fundamental research and practical applications of Fe_3O_4 in lithium battery,spliting-water and magnetic fields.
【作者单位】:聊城大学化学化工学院山东省化学储能与新型电池技术重点实验室 聊城大学材料与工程学院 大连理工大学 日本九州工业大学
【分类号】:O643.36;TM914.4
【正文快照】:
Figure 1.Schematic diagrams to illustrate simple methods for preparing Fe3O4@RGO(reducedgraphene oxide)nano-micro composite catalysts and photovoltaic propertiesEarth-abundant and nano-micro composite catalysts of Fe_3O_4@reduced graphene oxide for green

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