Synthesis of CoFe2O4/graphene composite as a novel counter electrode for high performance dye-sensitized solar cells
Synthesis of CoFe2O4/graphene composite as a novel counter electrode for high performance dye-sensitized solar cells
复制标题
CoFe2O4/石墨烯复合材料的合成作为高性能染料敏化太阳能电池的新型对电极
DOI：
10.1016/j.electacta.2018.11.170
复制
发表时间：
2019-02-20
影响因子：
6.6
通讯作者：
Dong, Lifeng
中科院分区：
文献类型：
--
作者：
Pang, Beili;Lin, Shan;Dong, Lifeng
制备了一种新型的CoFe2O4纳米颗粒与石墨烯纳米片的纳米复合材料（CoFe2O4/GN）作为染料敏化太阳能电池（DSSCs）的对电极。制备了尺寸约为3 nm的CoFe2O4纳米颗粒，研究了CoFe2O4对石墨烯电化学性能的影响。固定在石墨烯纳米片上的CoFe2O4纳米颗粒可以作为间隔物，防止石墨烯聚集，从而为电解质分子提供有效的扩散途径和更活跃的表面积。此外，纳米CoFe2O4具有较强的催化活性，可以加速三碘化物的还原。同时，石墨烯改善了催化过程中的电荷转移。与CoFe2O4、石墨烯和Pt电极相比，CoFe2O4/GN电极由于具有最小的电荷转移电阻而表现出更高的催化活性。用CoFe2O4/GN制备的DSSCs的光电转换效率比Pt电极（6.54%）提高了9.04%。该研究表明，CoFe2O4/GN可以代替昂贵的Pt电极大规模制备低成本、高效率的DSSCs。(C) 2018 Elsevier Ltd.版权所有。
A novel nanocomposite of CoFe2O4 nanoparticles with graphene nanosheet (CoFe2O4/GN) is prepared as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). The size of CoFe2O4 nanoparticles is about 3 nm, and the influence of CoFe2O4 on the electrochemical properties of graphene is studied. The CoFe2O4 nanoparticles anchored on graphene nanosheets can serve as spacers to prevent graphene aggregations and thereby provide efficient diffusion pathways and more active surface area for electrolyte molecules. Also, the CoFe2O4 nanoparticles with substantial catalytic activity accelerate the reduction of triiodide. Meanwhile the graphene improves charge transfer during the catalytic process. Compared with CoFe2O4, graphene, and Pt electrodes, the CoFe2O4/GN electrode displays higher catalytic activity because of its minimal charge transfer resistance. The DSSCs fabricated with CoFe2O4/GN demonstrate an improved photoelectric conversion efficiency of 9.04% in comparison to Pt electrodes (6.54%). This study suggests that CoFe2O4/GN can replace expensive Pt electrodes for large-scale fabrication of low cost and high efficiency DSSCs. (C) 2018 Elsevier Ltd. All rights reserved.