Author/Authors :
nassif, n. central metallurgical research development institute (cmrdi), Cairo, Egypt , abdel hamid, z. central metallurgical research development institute (cmrdi), Cairo, Egypt , ghayad, i. m. central metallurgical research development institute (cmrdi), Cairo, Egypt , abdel-monem, yasser k. menoufia university - faculty of science - department of chemistry, Menoufia, Egypt , ismail, amal e. academy of scientific research and technology (asrt), Cairo, Egypt
Abstract :
Silver nanoparticles were electrodeposited on graphite by means of the double-pulse technique from cyanide-free bath to be used as electrocatalyst of ethanol oxidation in fuel cells. The effect of double-pulse parameters on the electrocatalytic performance and the stability of the electrocatalyst during the ethanol electrooxidation in alkaline media was investigated by field emission scanning electron microscope (FESEM), XRD and different electrochemical testing methods.The results derived showed that increasing the nucleation potential cathodically increase the nucleation rate and particle density and decrease the particle size. Meanwhile, increasing nucleation time increase the particle density, decrease particle size and increase disparity. On the other hand, increasing growth time increases the particle size, whereas increasing growth potential cathodically from (OCP) is beneficial. The double pulse electrocatalyst shows superior electrocatalytic performance and poisoning resistance over pulsed current electrodes.
Keywords :
Douple pulse electrodeposition , Nano silver , electrocatalytic deposition , fuel cells
