A low-cost counter electrode of ITO glass coated with a graphene/Nafion® composite film for use in dye-sensitized solar cells

Min Hsin Yeh, Chia Liang Sun, Jheng Sin Su, Lu Yin Lin, Chuan Pei Lee, Chia Yuan Chen, Chun Guey Wu, R. Vittal, Kuo Chuan Ho

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

Carbon black (CB), multi-walled carbon nanotube (MWCNT), and graphene (GN) were examined as catalytic films on the counter electrodes (CEs) of dye-sensitized solar cells (DSSCs). GN exhibits the best performance among these materials for the corresponding cell. A composite film of GN/Nafion® was next used as the catalytic film on the CE of a DSSC. Nafion® is demonstrated to be an excellent dispersant for inhibiting the aggregation of GN. A solar-to-electricity conversion efficiency (η) of 8.19% was achieved for the DSSC sensitized by TBA(Ru[(4-carboxylic acid-4′-carboxylate-2,2′- bipyridine)(4,4′-bis(5-(hexylthio)-2,2′-bithien-5′-yl)-2, 2′-bipyridine)(NCS) 2]), i.e., CYC-B11 dye, which was synthesized by our group, after the optimization of the composition of GN/Nafion®, and an η of 8.89% was exhibited for the cell with a sputtered-Pt (s-Pt) film on its CE under the same conditions. The significance of the cell with the composite film of GN/Nafion® lies in the fact that the expensive Pt is avoided in this case, thereby the cost of the pertinent DSSC was greatly reduced, even though its η (8.19%) is slightly smaller than that of the cell with the s-Pt film (8.89%).

Original languageEnglish
Pages (from-to)4192-4202
Number of pages11
JournalCarbon
Volume50
Issue number11
DOIs
StatePublished - Sep 2012

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