N-Doped Graphene Nanoplatelets as Superior Metal-Free Counter Electrodes for Organic Dye-Sensitized Solar Cells
- Authors
- Ju, Myung Jong; Kim, Jae Cheon; Choi, Hyun-Jung; Choi, In Taek; Kim, Sang Gyun; Lim, Kimin; Ko, Jaejung; Lee, Jae-Joon; Jeon, In-Yup; Baek, Jong-Beom; Kim, Hwan Kyu
- Issue Date
- 6월-2013
- Publisher
- AMER CHEMICAL SOC
- Keywords
- N-doped graphene nanoplatelets; charge-transfer resistance; organic dye-sensitized solar cells; electrocatalytic activity; Co(bpy)(3)(3+/2+) redox couple
- Citation
- ACS NANO, v.7, no.6, pp.5243 - 5250
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS NANO
- Volume
- 7
- Number
- 6
- Start Page
- 5243
- End Page
- 5250
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/103153
- DOI
- 10.1021/nn4009774
- ISSN
- 1936-0851
- Abstract
- Highly efficient counter electrodes (CEs) for dye-sensitized solar cells (DSScs) were developed using thin films of scalable and high-quality, nitrogen-doped graphene nanoplatelets (NGnP), which was synthesized by a simple two-step reaction sequence. The resultant NGnP was deposited on fluorine-doped SnO2 (FTO)/glass substrates by using electrospray (e-spray) coating, and their electrocatalytic activities were systematically evaluated for Co(bpy)(3)(3+/2+) redox couple in DSSCs with an organic sensitizer. The e-sprayed NGnP thin films exhibited outstanding performances as CEs for DSSCs. The optimized NGnP electrode showed better electrochemical stability under prolonged cycling potential, and its R-ct at the interface of the CE/electrolyte decreased down to 1.73 Omega cm(2), a value much lower than that of the Pt electrode (3.15 Omega cm(2)). The DSSC with the optimized NGnP-CE had a higher fill factor (FF, 74.2%) and a cell efficiency (9.05%), whereas those of the DSSC using Pt-CE were only 70.6% and 8.43%, respectively. To the best of our knowledge, the extraordinarily better current voltage characteristics of the DSSC-NGnP outperforming the DSSC-Pt for the Co(bpy)(3)(3+/2+) redox couple (in paticular, FF and short circuit current, J(sc)) is highlighted for the first time.
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Collections - Graduate School > Department of Advanced Materials Chemistry > 1. Journal Articles
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