dc.contributor.author |
John, Benjamin M. |
|
dc.contributor.author |
Katumo, Ngei |
|
dc.contributor.author |
Mugo, Simon W. |
|
dc.contributor.author |
Ngaruiya, James M. |
|
dc.contributor.author |
Ngumbi, Paul K. |
|
dc.date.accessioned |
2016-03-21T11:46:13Z |
|
dc.date.available |
2016-03-21T11:46:13Z |
|
dc.date.issued |
2015 |
|
dc.identifier.citation |
International Journal of Innovative Research in Science, Engineering and Technology; Vol. 4, Issue 12, December 2015 |
en_US |
dc.identifier.issn |
2319-8753 |
|
dc.identifier.issn |
2347-6710 |
|
dc.identifier.uri |
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&ved=0ahUKEwj2udGR19HLAhWJOBoKHQwUD8MQFghFMAU&url=http%3A%2F%2Fwww.ijirset.com%2Fupload%2F2015%2Fdecember%2F106_Graphene_For.pdf&usg=AFQjCNHBbV57GZllpf3VsNAc8njwp2g9Xw&sig2=Zz-584ghw_OcwQVBrqONWA&cad=rja |
|
dc.identifier.uri |
http://repository.seku.ac.ke/handle/123456789/1994 |
|
dc.description.abstract |
A Platinum (Pt) film was prepared on graphene-fluorine-doped tin oxide (FTO) substrate through doctor
blade procedure and investigated as a counter electrode (CE) for dye sensitized solar cells (DSSCs). Dye loading of the
TiO2 photoanode was quantitatively evaluated by UV-VIS-NIR spectrophotometry. Upon DSSCs fabrication, the
current density-voltage (I-V) characteristics were evaluated with simulated solar irradiation of 100 mW/cm
2
(AM 1.5).
The DSSC with platinum/graphene (Pt/Gr) as CE exhibited a power conversion efficiency, PCE (η) of 3.96 % ,
whereas that of Pt-film CE which had a PCE (η) of 3.48%. This is a 13.8% improvement in PCE. The Pt/Gr bilayer CE
achieved a photocurrent density (Jsc) of 9.76 mA/cm
2
whereas the Pt-film (Jsc) had 8.72 mA/cm
2
, which was a 12%
improvement. The improvement in performance of Pt/Gr CE is shown to be due to enhanced catalytic activity resulting
in reduced charge transfer resistance. Platinum free graphene CE based DSSCs achieved PCE of 1.38%. The fill factor
(FF) of graphene based DSSC was low at 0.21 and is shown to result from poor catalytic activity leading to high charge
transfer resistance at the graphene-electrolyte interface. |
en_US |
dc.language.iso |
en |
en_US |
dc.subject |
Dye sensitized solar cells |
en_US |
dc.subject |
Counter electrode |
en_US |
dc.subject |
Graphene |
en_US |
dc.subject |
Platinum-Graphene |
en_US |
dc.subject |
Catalytic activity |
en_US |
dc.subject |
Electron-tunnelling |
en_US |
dc.title |
Graphene supported platinum counter electrode for dye sensitized solar cells |
en_US |
dc.type |
Article |
en_US |