Remarkable Enhancement in the Photoelectric Performance of Uniform Flower-like Mesoporous Fe3 O4 Wrapped in Nitrogen-Doped Graphene Networks

ACS Applied Materials & Interfaces
Jixin YaoGuang Li

Abstract

The porous structure and excellent specific surface area are superior for use as a counter electrode (CE) material. In addition, N-doped graphene possesses a remarkable electron-transfer pathway and many active sites. Therefore, a novel idea is to wrap uniform flower-like mesoporous Fe3O4 (Fe3O4UFM) in an N-doped graphene (N-RGO) network structure to enhance the power conversion efficiency (PCE). The hybrid materials of Fe3O4UFM@N-RGO are first used as a CE in dye-sensitized solar cells (DSSCs), showing a preeminent conductive interconnected 3D porous structure with more catalytic activity sites and a better ability for and a faster reaction rate of charge transfer, resulting in quicker reduction of I3- than Pt. A 9.26% photoelectric conversion efficiency has been achieved for the DSSCs with Fe3O4UFM@N-RGO as the CE, which is beyond the value of Pt (7.72%). The positive synergetic effect between Fe3O4 and N-RGO is mainly responsible for the remarkable photoelectric property enhancement of this uniform flower-like mesoporous Fe3O4 wrapped in N-doped graphene networks, as demonstrated by the Tafel polarization, electrochemical impedance spectra, and CV curves. These methods will provide a simple way to effectively reproduce CE ma...Continue Reading

References

Aug 8, 2008·Nature Nanotechnology·Xu DuEva Y Andrei
Oct 23, 2009·Journal of the American Chemical Society·Mingkui WangMichael Grätzel
Mar 10, 2011·Chemical Communications : Chem Comm·Mingxing WuTingli Ma
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Jan 28, 2012·Journal of the American Chemical Society·Mingxing WuTingli Ma
Mar 14, 2013·Nature Communications·Yu HouHua Gui Yang
May 30, 2014·Chemical Communications : Chem Comm·Mingxing GuoLiqi Jiao
May 18, 2017·ACS Applied Materials & Interfaces·Yue LouShouhua Feng

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