PtSn/GO Co-Catalyst for Quasi-Solid-State Dye Sensitized Solar Cells

Abstract:

Dye sensitized solar cells (DSSCs) consist of photoanodes (dye adsorbed porous semiconductor film), electrolytes and counter electrodes. Nanostructured materials play important parts in both the photoanodes and the counter electrodes, while dyes are there to absorb photons and generate electron-hole pairs and electrolytes are there to transfer electrons from the photoanodes to the counter electrodes. In this study, to enhance light absorption and minimize electron-hole recombination, Ag nanoparticles and MgO nanolayer were coated on TiO₂, respectively. To enable a long lifetime, i.e. avoiding liquid electrolyte leakage, quasi-solid-state (QSS) DSSCs were fabricated. PtSn nanoparticles were prepared by a simple chemical reduction method on graphene oxide (GO) to compare with conventional Pt catalyst on FTO substrates as counter electrodes. An average efficiency of the QSS DSSCs with PtSn/GO co-catalysts was found to outperform that of the QSS DSSCs with conventional Pt catalyst. A mixed microstructure of the PtSn/GO co-catalyst was observed. Although, PtSn₂ and Pt₂Sn₃ phases were suggested by XRD, in a small region observed by EDX-STEM, it was found that C, O and Si were distributed uniformly on the graphene oxide film. Pt was also distributed uniformly, but the signal was low so there were only a few X-Ray counts across the image. There was no sign of Pt being concentrated in the particles. However, Sn was found to be concentrated in the particles without any other elements.

• Periodical: Solid State Phenomena (Volume 283)
• Pages: 55-64
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.283.55
• Online since: September 2018
• Authors: Voranuch Somsongkul, Surassawatee Jamikorn, Chanu Photiphitak, Thapanee Sarakonsri, Viratchara Laokawee, Nutpaphat Jarulertwathana, Naruephon Mahamai, Rawinunt Thanachayanont, Suchada Srisakuna, Chris Boothroyd, Taweechai Amornsakchai, Pasit Pakawatpanurut, Pennapa Muthitamongkol, Visittapong Yordsri, Chanchana Thanachayanont*
• Keywords: Co-Catalyst, Counter Electrode, Dye Sensitized Solar Cell, GO, PtSn, Quasi Solid State

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