Dye-sensitized solar cells with 3D flower-like alpha-Fe2O3-decorated reduced graphenes oxide as photoanodes
Dye-sensitized solar cells with 3D flower-like alpha-Fe2O3-decorated reduced graphenes oxide as photoanodes
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以 3D 花状 α-Fe2O3 装饰的还原氧化石墨烯作为光阳极的染料敏化太阳能电池
DOI：
10.1007/s11581-015-1561-5
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发表时间：
2016
期刊：
影响因子：
2.8
通讯作者：
Xu Jinzhang
中科院分区：
文献类型：
--
作者：
Shang Xin;Guo Zhiqiang;Gan Wei;Zhou Ru;Ma Cheng;Hu Ke;Niu Haihong;Xu Jinzhang
本文首次报道了将α-Fe2O3NPs的生长与氧化石墨烯（GO）相结合，一步合成花朵状α- fe2o3层次化纳米粒子(NPs)/还原性氧化石墨烯（RGO）杂化体的环保方法。具有羟基（-OH）和羰基（-OOH）等官能团的氧化石墨烯薄片在乙醇和水溶液中可以通过溶剂热过程与花状α- fe2o3的花瓣结合，在此过程中，氧化石墨烯不需要添加任何强还原剂，也不需要任何高温后退火过程，氧化石墨烯被还原为RGO。制备的样品疏松多孔，呈花状结构，RGO杂化体均匀包裹在α-Fe2O3NPs薄片上。为了证明其潜在的应用前景，我们利用合成的层叠花状α-Fe2O3/RGO制备了染料敏化太阳能电池（DSSCs），并对其作为DSSCs的光阳极进行了研究。结果表明，层次化α-Fe2O3/RGO太阳能电池性能优于自由α-Fe2O3NPs。光伏性能的增强归功于其独特的多孔性和良好的导电性，这使得I -离子更有效地扩散，并促进了网络中电子的转移。
For the first time, we report a one-step fabrication of an environment-friendly approach to synthesize flower-like α-Fe2O3hierarchical nanoparticles (NPs)/reduced graphene oxide (RGO) hybrids by combining the graphene oxide (GO) with the growth of α-Fe2O3NPs. The GO sheet which possesses the functional group, such as hydroxyl (–OH) and carbonyl groups (–OOH), can be easily incorporated with the petal of the flower-like α-Fe2O3in ethanol and water solution through a solvothermal process, during which GO is reduced to RGO without the addition of any strong reducing agent or requiring any post-high-temperature annealing process. The as-prepared samples are loose and porous with flower-like structure, and the RGO hybrids were wrapped up uniformly on the sheet of α-Fe2O3NPs. To demonstrate the potential applications, we have fabricated dye-sensitized solar cells (DSSCs) from the as-synthesized hierarchical flower-like α-Fe2O3/RGO and investigated it for the photoanode of DSSCs. Results show that the hierarchical α-Fe2O3/RGO solar cell exhibits improved performances in comparison with the free α-Fe2O3NPs. The enhancement of photovoltaic properties is attributed to the unique porous nature and good conductivity which allow more efficient diffusion of I−ions and facilitate the transfer of electron in the network.