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Graphene Supported Platinum Nanoparticle Counter-Electrode for Enhanced Performance of Dye-Sensitized Solar Cells

2011; American Chemical Society; Volume: 3; Issue: 10 Linguagem: Inglês

10.1021/am200721x

1944-8252

Reeti Bajpai, Soumyendu Roy, Pragyensh Kumar, Preeti Bajpai, Neha Kulshrestha, Javad Rafiee, Nikhil Koratkar, D.S. Misra,

Electrochemical sensors and biosensors

Composites of few layered graphene (G) and platinum (Pt) nanoparticles (NP) with different loadings of Pt were used as counter electrode (CE) in dye-sensitized solar cell (DSSC). NPs were deposited directly on to G using pulsed laser ablation method (PLD). DSSCs formed using the composite CEs show improved performance compared to conventional Pt thin film electrode (Std Pt) and unsupported Pt NPs. Composite with 27% loading of Pt shows 45% higher efficiency (η = 2.9%), greater short circuit current (Jsc = 6.67 mA cm–2), and open circuit voltage (Voc = 0.74 V) without any loss of the fill factor (FF = 58%) as compared to the cells fabricated using Std Pt electrodes. Values of η, Jsc and Voc for DSSC using Std Pt CE were 2%, 5.05 mA cm–2 and 0.68 V, respectively. Electrochemical impedance spectroscopy using I–3/I– redox couple confirm lower values of charge transfer resistance for the composite electrodes, e.g., 2.36 Ω cm2 as opposed to 7.73 Ω cm2 of Std Pt. The better catalytic activity of these composite materials is also reflected in the stronger I–3 reduction peaks in cyclic voltammetry scans.