B. V. Mohan Kumar; R. Thomas; A. Mathew; G. Mohan Rao; D. Mangalaraj; N. Ponpandian; C. Viswanathan
Abstract
Multiwall carbon nanotubes (MWCNT) are synthesised by cost effective method of pyrolysing xylene (as hydrocarbon, precursor) in the presence of ferrocene (as catalyst) at 750 o C. The so obtained MWCNTs has a length ranging from 90 µm to 300 µm and diameter ranging from 20 nm to 200 nm depending ...
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Multiwall carbon nanotubes (MWCNT) are synthesised by cost effective method of pyrolysing xylene (as hydrocarbon, precursor) in the presence of ferrocene (as catalyst) at 750 o C. The so obtained MWCNTs has a length ranging from 90 µm to 300 µm and diameter ranging from 20 nm to 200 nm depending on the amount of ferrocene added to the xylene for the synthesis. The diameter of the MWCNT’s increased with the increase in ferrocene content in the precursor solution. Bigger agglomerates of iron particle lead to the growth of larger diameter MWCNTs. These MWCNTs with higher concentration of iron nanoparticles in it are useful for catalytic applications. X-ray diffraction (XRD) of the as-synthesised MWCNTs showed a graphitic-like peak (002). Field emission scanning electron microscope (FESEM) is utilized for its morphological analysis, Raman analysis showed the presence of D band (about 1350 cm -1 ) and G band (about 1580 cm -1 ) indicating high crystalline graphitic layers. Fourier transform infrared (FTIR) studies in the transmission mode were carried out in the range 400 - 4000 cm -1 (peaks at 1386, 1639, 2363, 3434, 3747 cm -1 etc.) for bond stretching analysis. All the characterization processes were carried out before and after purification process. The MWCNT’s diameter and their distribution are studied with the help of ImageJ software using the FESEM micrographs.
Ambily Mathew; G. Mohan Rao; N. Munichandraiah
Abstract
The present paper describes the scheme used to fabricate completely sealed dye sensitized solar cell (DSC) and its stability analysis employing acetonitrile as the solvent for redox couple. Since acetonitrile is extremely volatile a perfect sealing is essential to prevent the leakage of electrolyte. ...
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The present paper describes the scheme used to fabricate completely sealed dye sensitized solar cell (DSC) and its stability analysis employing acetonitrile as the solvent for redox couple. Since acetonitrile is extremely volatile a perfect sealing is essential to prevent the leakage of electrolyte. The usual hot melt sealing is employed for edge sealing whereas hole sealing is carried out with tooth pick and a UV curable adhesive. The degradation in efficiency is found to be 20% for low efficiency cells whereas, for high efficiency cells it is found to be 45% after 45 days. The leakage of highly volatile acetonitrile through the edge and hole is mainly responsible for the reduction in the performance of the device. Hence a high temperature sealing method is proposed to fabricate stable cells.
