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Graphene counter electrodes for dye-sensitized solar cells prepared by electrophoretic deposition
Choi, Hyonkwang,Kim, Hyunkook,Hwang, Sookhyun,Han, Youngmoon,Jeon, Minhyon Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.21
<P>The graphene counter electrodes (GCEs) for dye-sensitized solar cells (DSSCs) prepared by electrophoretic deposition (EPD) are reported. Thermogravimetric analysis (TGA) was carried out to find the optimum annealing temperatures. It was found that charge transfer resistance (<I>R</I><SUB>ct1</SUB>) related to the interface between electrolyte and counter electrode was significantly reduced by proper annealing. DSSC with GCE annealed at 600 °C demonstrated by the best conversion efficiency of 5.69% under AM 1.5 and 1 sun condition. Once GCE prepared by EPD is fully developed, it could be utilized for a low-cost, high throughput process for DSSCs.</P> <P>Graphic Abstract</P><P>Dye-sensitized solar cell with a graphene counter electrode prepared by electrophoretic deposition demonstrated the best conversion efficiency of 5.69%. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm11145k'> </P>
Carbon nanotubes radially anchored on carbon fibers formed by polyacrylonitrile
Hwang, Sookhyun,Kim, Sangwoo,Cho, Gyu-bong,Choi, Hyonkwang Elsevier 2018 Materials research bulletin Vol.97 No.-
<P><B>Abstract</B></P> <P>We investigated a hybrid nanostructure comprised of carbon nanotubes (CNTs) directly grown on polyacrylonitrile-based carbon fibers (PAN-CFs) for three-dimensional energy materials. The optimum growth conditions, such as catalyst loading time in electroless deposition and growth temperature in chemical vapor deposition were identified. The thorn bush-like structures of the multi-walled CNTs on CFs were evaluated by field emission transmission electron microscope and field emission scanning electron microscope. Raman spectra and attenuated total reflectance Fourier transform infrared spectroscopy were used to analyze the crystal and chemical structures of CNTs on CFs. Base on the results from four-point probe measurement, the sheet resistance dropped from 40Ω/sq for PAN-CFs to less than 10Ω/sq for CNTs-grown PAN-CFs. The obtained CNTs/PAN-CFs revealed the specific surface area of 64.4m<SUP>2</SUP>/g with a pore volume of 0.18cm<SUP>3</SUP>/g. Moreover, a sulfur electrode with the CNTs/PAN-CFs current collector exhibited higher electrochemical performance than that of the electrode with planar aluminum current collector.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Vertically aligned carbon nanotubes on carbon fibers were grown by using electroless plating and CVD method. </LI> <LI> The optimized CNTs/CFs revealing a surface area of 64.4cm<SUP>2</SUP>/g and a sheet resistance of 10Ω/sq was achieved. </LI> <LI> For the practical electrochemical application, a CNTs/CFs electrode was used as a current collector of lithium/sulfur cell. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>