Aqueous Dispersible Graphene/Pt Nanohybrids by Green Chemistry: Application as Cathodes for Dye-Sensitized Solar Cells

Title
Aqueous Dispersible Graphene/Pt Nanohybrids by Green Chemistry: Application as Cathodes for Dye-Sensitized Solar Cells
Authors
김영곤Zico Alaia Akbar김동영조성무장성연
Keywords
Graphene/Pt Nanohybrids; grren chemistry; counter electrode; dye-sensitized solar cell; graphene nanosheet; platinum; electrocatalytic activity
Issue Date
2013-03
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 5, NO 6, 2053-2061
Abstract
Aqueous dispersible nanohybrids (NHBs) of graphene nanosheets (GNSs) and Pt nanoparticles (Pt-NPs) were synthesized through the one-pot reduction of their precursors using an environmentally benign chemical, vitamin C. The concurrent reduction of the precursors, which includes graphene oxide (GO) to GNS and H2PtCl6 to Pt0, was facile and efficient to yield GNS/Pt-NHBs in which face-centered cubic (fcc) crystalline Pt-NPs with average diameters of 5 nm were robustly attached on the surface of the GNSs. The conversion yield during Pt reduction was fairly high (90%) and the Pt content within the NHBs was easily controllable. The resulting stable aqueous colloidal dispersion of GNS/Pt-NHBs was successfully fabricated as thin films without using any binder by the electro-spray method at room temperature, and the fabricated samples were used as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). The electrocatalytic activity of the NHBs for I&#8211;/I3&#8211; redox couples in conventional DSSCs was investigated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis. Doping of GNSs with small amounts of Pt-NPs (<10 wt %) could dramatically enhance the redox kinetics. The enhanced electrocatalytic activity of the GNS/Pt-NHBs was reflected in the performance of the DSSCs. The power conversion efficiency of optimized DSSCs using the NHB-CEs was 8.91% (VOC: 830 mV, JSC: 15.56 mAcm&#8211;2, and FF: 69%), which is comparable to that of devices using the state-of-the-art Pt-based CEs (8.85%).
URI
http://pubs.kist.re.kr/handle/201004/45211
ISSN
19448244
Appears in Collections:
KIST Publication > Article
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