Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 44, Pages 13885-13889Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta12972a
Keywords
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Funding
- National Natural Science Foundation of China [90922028, U1205112, 51002053]
- specialized research fund for the doctoral program of Higher University, Ministry of Education, China [20123501110001]
- Fujian Provincial Science and Technology Program [2011H2002]
- Jiangsu Provincial Science and Technology Support Program [BE2011163]
- Science Council in Taiwan [NSC-100-2221-E-036-022]
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Multi-wall carbon nanotubes (MWCNTs) were deposited on a titanium (Ti) foil substrate by using electrophoresis, then a nano-corallines nickel sulfide (NiS) was deposited on the MWCNTs by using a pulse potentiostatic method. The high performance NiS/MWCNT/Ti hybrid film was firstly used as a Pt-free counter electrode (CE) in dye-sensitized solar cells (DSSCs). The surface of MWCNTs was wrapped with a nano-corallines NiS thin film of similar to 45 nm in thickness. Under full sunlight illumination (100 mW cm(-2), AM 1.5 G), DSSCs with a NiS/MWCNT/Ti CE achieved an enhanced photovoltaic conversion efficiency of 7.90%, while DSSCs with a Pt/Ti CE obtained the efficiency of 6.36%. The characterization of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) indicated that nanocorallines NiS had high electrocatalytic activity for I-3(-) reduction, MWCNTs had high specific surface area and low resistance, and the synergistic effect of NiS and MWCNTs endowed the superior features of the hybrid film. Therefore, the NiS/MWCNT/Ti CE can be used as a promising alternative CE in low-cost and large-scale DSSCs.
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