BROWSE

Related Researcher

Author's Photo

Baek, Jong-Beom
Center for Dimension-Controllable Organic Frameworks
Research Interests
  • Covalent Organic Frameworks (COFs), Carbon Nanotubes(CNTs), graphene, Energy Conversion and Storage

ITEM VIEW & DOWNLOAD

Comparative study of edge-functionalized graphene nanoplatelets as metal-free counter electrodes for highly efficient dye-sensitized solar cells

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Comparative study of edge-functionalized graphene nanoplatelets as metal-free counter electrodes for highly efficient dye-sensitized solar cells
Author
Kim, Chang KiKim, Hong MoAftabuzzaman, M.Jeon, In-YupKang, Sung HoEom, Yu KyungBaek, Jong-BeomKim, Hwan Kyu
Issue Date
2018-09
Publisher
ELSEVIER SCI LTD
Citation
MATERIALS TODAY ENERGY, v.9, pp.67 - 73
Abstract
Edge-functionalized graphene nanoplatelets (GnPs) were synthesized by a simple ball-milling process of graphite in the presence of halogen (F, I), metalloids (Se, Te and Sb) and subsequently applied to dye-sensitized solar cells (DSSCs) as counter electrodes (CEs). In our previous works, a series of edge-functionalized GnPs were thoroughly studied and successfully utilized as CEs in DSSCs, with the aim of finding possible alternatives to the noble and expensive Pt metal as CE. However, in each study, the GnP-CEs were not only fabricated with different dyes and electrolytes but were also evaluated on different occasions, and thus, it was difficult to identify which type of edge-functionalized GnPs was the best. Herein, DSSCs with different edge-functionalized GnP-CEs were fabricated under the same environmental conditions, photovoltaic performances were then evaluated employing both I−/I3 − and Co(bpy)3 2+/3+ (bpy = 2,2′-bipyridine) redox couples with three different sensitizers to assess the electrocatalytic activity of the different GnP-CEs. Photovoltaic performances of edge-halogenated GnP-CEs with N719 dye employing the I−/I3 − redox couple were lower than those of the metalloid-doped GnP-CEs and were even inferior to Pt-CE, which was consistent with the Rct values. Conversely, among the metalloid-doped GnP-CEs, SbGnP-CE exhibited a higher Rct value and lower power conversion efficiency (PCE) value of 8.70% and 6.60% with N719 and SGT-130 dyes, respectively. However, when the devices were fabricated with the Co(bpy)3 2+/3+ redox couple, the opposite occurred and SbGnPs displayed the highest PCE of 10.42% with SGT-130 dye and 12.08% with SGT-021 dye. Furthermore, SeGnP-CE and TeGnP-CE showed superior compared to the Pt-CE with both I−/I3 − and Co(bpy)3 2+/3+ electrolyte solutions.
URI
https://scholarworks.unist.ac.kr/handle/201301/25099
URL
https://www.sciencedirect.com/science/article/pii/S246860691830056X?via%3Dihub
DOI
10.1016/j.mtener.2018.05.003
ISSN
2468-6069
Appears in Collections:
ECHE_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU