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Helical carbon nanofiber (HCNF) is prepared by the pyrolysis of acetylene using Cu nanoparticle catalyst and investigated as the low-cost counter electrode in dye-sensitized solar cells. The obtained HCNF sample displays a form of regular single nanocoil with the coil diameter of 50nm and has a high surface area of 156m2g−1. The electrochemical measurements indicate that HCNF electrode possesses an...
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