Abstract
Pt and Pd sequentially electrodeposited Au nanoparticles loaded carbon nanotube (Au-CNT) was prepared for the electrocatalytic study of methanol, ethanol, and formic acid oxidations. All electrochemical measurements were carried out in a three-electrode cell. A platinum wire and Ag/AgCl were used as auxiliary and reference electrodes, respectively. Suspension of the Au-CNT, phosphate buffer, isopropanol, and Nafion was mixed and dropped on glassy carbon as a working electrode. By sequential deposition method, PdPtPt/Au-CNT, PtPdPd/Au-CNT, and PtPdPt/Au-CNT catalysts were prepared. Cyclic voltammograms (CVs) of those catalysts in 1 M H2SO4solution showed hydrogen adsorption and hydrogen desorption reactions. CV responses for those three catalysts in methanol, ethanol, and formic acid electrooxidations studied in 2 M CH3OH, CH3CH2OH, and HCOOH in 1 M H2SO4show characteristic oxidation peaks. The oxidation peaks at anodic scan contribute to those organic substance oxidations while the peaks at cathodic scan are related with the reoxidation of the adsorbed carbonaceous species. Comparing all those three catalysts, it can be found that the PdPtPt/Au-CNT catalyst is good at methanol oxidation; the PtPdPt/Au-CNT effectively enhances ethanol oxidation while the PtPdPd/Au-CNT exceptionally catalyzes formic acid oxidation. Therefore, a different stoichiometry affects the electrochemical active surface area of the catalysts to achieve the catalytic oxidation reactions.
Highlights
Lack of power supply with high future consuming is the problem that everyone knows that they are going to face
The slow and incomplete catalytic oxidation reactions of these organic molecules taking place at an anode are the main impediment to practical applications of the direct methanol fuel cell (DMFC), direct ethanol fuel cell (DEFC), and direct formic acid fuel cell (DFAFC) [6,7,8]
Hydrogen adsorption/desorption peaks for the catalysts are not totally sharp indicating that some Pt are blocked on the surface by Pd oxide
Summary
Lack of power supply with high future consuming is the problem that everyone knows that they are going to face. Fuel cells are recognized because achievement of an electric energy can directly produce from the reaction of chemical substances [1,2,3]. Proton exchange fuel cell (PEMFC) is a leading candidate for nowadays application but it has some problems hydrogen storage. It can be relieved by replacing hydrogen with other liquid fuels such as methanol, ethanol, and formic acid [4, 5]. There are several serious technological challenges such as kinetic of the substances in the oxidation reactions. The oxidations have low equilibrium potentials but they need a large overpotential
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