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Alkaline fuel cell: carbon nanobeads coated with metal catalyst over porous ceramic for hydrogen electrode

DSpace at IIT Bombay

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Title Alkaline fuel cell: carbon nanobeads coated with metal catalyst over porous ceramic for hydrogen electrode
 
Creator CHATTERJEE, AK
SHARON, M
BANERJEE, R
 
Subject performance
carbon nanobeads
hydrogen electrode
chemical vapour deposition
porous ceramic
alkaline fuel
 
Description The development of a hydrogen electrode using a porous ceramic coated with carbon nanobeads for an alkaline fuel cell (AFC) is reported. This electrode can provide necessary strength and porosity to enable hydrogen to diffuse without allowing electrolyte to percolate inside the electrode. Various catalysts (Pt, Ni, Co and Fe) are electrochemically dispersed over the carbon nanobeads to examine their performance in the alkaline fuel cell. Turpentine oil has been used as a precursor for preparing the carbon nanobeads by a chemical vapour deposition technique. Scanning electron microscopic and transmission electron microscopic images show that the carbon nanobeads have sizes between 500 and 650 nm and are spread uniformly over the entire ceramic substrate. X-ray diffraction (XRD) patterns indicate that the nanobeads are graphitic in nature. Thus, the electrode is highly conductive. The current-voltage characteristics and chronopotentiometry of a half cell (i.e. hydrogen electrode coated with different electrocatalysts) and a full cell (using both hydrogen and oxygen electrodes) with 30% KOH solution are measured. About 93% of the theoretical hydrogen dissociation voltage is obtained with Ni and Pt catalyst. All other metals (Co and Fe) give a lower voltage. Ni-coated carbon nanobeads deposited over a ceramic oxide can be used in place of Raney nickel electrode as their characteristics are similar to those of a platinum electrode. (C) 2003 .
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-24T08:20:05Z
2011-12-26T13:01:43Z
2011-12-27T05:46:28Z
2011-07-24T08:20:05Z
2011-12-26T13:01:43Z
2011-12-27T05:46:28Z
2003
 
Type Article
 
Identifier JOURNAL OF POWER SOURCES, 117(1-2), 39-44
0378-7753
http://dx.doi.org/10.1016/S0378-7753(03)00111-3
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6367
http://hdl.handle.net/10054/6367
 
Language en