Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 4, Pages 1289-1295Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ta00073c
Keywords
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Funding
- National High Technology Research and Development Program of China [2009AA03Z217]
- National Natural Science Foundation of China [90922028, 51002053]
- National Science Council in Taiwan [NSC-100-2221-E-036-022]
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Because of the large specific surface area and superior electrical conductivity of multi-wall carbon nanotubes (MWCNTs) and the high electrocatalytic activity of cobalt sulfide (CoS), CoS/MWCNT hybrid films are deposited onto Ti foil substrates by sequential electrophoresis and pulse potentiostatic electrodeposition. Field-emission scanning electron microscopy observes that the surface of the MWCNTs is wrapped with a nano-honeycomb CoS thin film of similar to 55 nm in thickness. Cyclic voltammograms, electrochemical impedance spectroscopy, and Tafel polarization characterization indicate that the CoS/MWCNT/Ti counter electrode (CE) has better electrocatalytic activity for I-3(-) reduction than Pt CE. Under full sunlight illumination (100 mW cm(-2), AM 1.5 G), the dye-sensitized solar cell based on the CoS/MWCNT/Ti CE achieves a power conversion efficiency of 8.05%, which exceeds that of the device based on Pt/Ti CE (6.39%).
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