the large increase of the oxidation current but also in a negative shift in the onset potential of the oxidation reactions. The influence of temperature on the ...
Electrocatalytic Activity of NiOx Modified Electrodes Towards Oxidation of Small Organic Molecules Sayed M. El-Refaeia, Gumaa A. El-Nagara, Ahmed M. Mohammada,b, Mohamed S. El-Deaba, Bahgat E. ElAnadoulia a
Chemistry Department, Faculty of Science, Cairo University, Cairo 12613, Egypt.
b
Department of Chemical Engineering, Faculty of Engineering, The British University in Egypt, Cairo 11837, Egypt.
Abstract The nickel oxide-platinum nanoparticles modified glassy carbon electrode (NiOx/Pt/GC) is used as an effective anode for the oxidation of formic acid (FA), methanol (ME) and ethanol (ET) in 0.3 NaOH solution. The loading of GC with NiOx and Pt is achieved electrochemically. The modified electrodes are characterized using cyclic voltammetry (CV) and scanning electron microscopy (SEM). The catalytic improvement observed at the NiOx/Pt/GC electrode for FAO, MEO, and ETO was not only confined in the large increase of the oxidation current but also in a negative shift in the onset potential of the oxidation reactions. The influence of temperature on the oxidation current is investigated and the apparent activation energy, Ea, for each fuel is calculated at a specific potential. Furthermore, the NiOx/Pt/GC electrode shows a satisfactory stability for FAO, MEO, and ETO in 0.3 M NaOH solution.
