Multiwalled Carbon Nanotube@Reduced Graphene Oxide Nanoribbon as the Counter Electrode for Dye-Sensitized Solar Cells

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• 作者：Min-Hsin Yeh ; Lu-Yin Lin ; Chia-Liang Sun ; Yow-An Leu ; Jin-Ting Tsai ; Chen-Yu Yeh ; R. Vittal ; Kuo-Chuan Ho
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 31, 2014
• 年：2014
• 卷：118
• 期：30
• 页码：16626-16634
• 全文大小：482K
• ISSN：1932-7455

文摘

In this study, a new core鈥搒hell heterostructure of multiwalled carbon nanotube@reduced graphene oxide nanoribbon (MWCNT@rGONR) was prepared by modified microwave-assisted synthesis step and a chemical reduction. The core鈥搒hell heterostructure of MWCNT@rGONR was used as the catalytic film of the counter electrode (CE) of a dye-sensitized solar cell (DSSC). The chemical state and the degree of defects on the surface of MWCNT@rGONR were investigated by X-ray photoelectron spectroscopy (XPS) and Raman spectra, respectively. Transmission electron microscopy (TEM) image of the film of MWCNT@rGONR shows graphene sheet, covering on a MWCNT, indicating a core of the carbon nanotube and its shell of graphene. Photocurrent density鈥搗oltage characteristics of the DSSCs, using commercial graphene nanopowder (GNP), MWCNT, and MWCNT@rGONR as the CE materials were obtained at 100 mW cm^鈥?. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to study the electrocatalytic abilities of the films of GNP, MWCNT, and MWCNT@rGONR. Owing to the excellent electrocatalytic ability of the MWCNT@rGONR for the reduction of triiodide ions (I₃^{鈥?/sup>), a solar-to-electricity conversion efficiency (畏) of 6.91% was achieved for its DSSC, using our synthesized YD2-o-C8 porphyrin dye, while efficiencies of 4.48% and 5.93% were obtained for the DSSCs with the bare GNP and pristine MWCNT, respectively. The performance of the cell with the MWCNT@rGONR is comparable to that of the cell with a sputtered Pt (s-Pt) on its CE (7.26%).}