High performance Pd-based catalysts for oxidation of formic acid
College of Chemistry, South China University of Technology, Guangzhou, 510641, China; South Africa Institute for Advanced Materials Chemistry, University of the Western Cape, South Africa
Two novel catalysts for anode oxidation of formic acid, Pd2Co/C and Pd4Co2Ir/C, were prepared by an organic colloid method with sodium citrate as a complexing agent. These two catalysts showed better performance towards the anodic oxidation of formic acid than Pd/C catalyst and commercial Pt/C catalyst. Compared with Pd/C catalyst, potentials of the anodic peak of formic acid at the Pd2Co/C and Pd4Co2Ir/C catalyst electrodes shifted towards negative value by 140 and 50 mV, respectively, meanwhile showed higher current densities. At potential of 0.05 V (vs. SCE), the current density for Pd4Co2Ir/C catalyst is as high as up to 13.7 mA cm-2, which is twice of that for Pd/C catalyst, and six times of that for commercial Pt/C catalyst. The alloy catalysts were nanostructured with a diameter of ca. 3-5 nm and well dispersed on carbon according to X-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements. The composition of alloy catalysts was analyzed by energy dispersive X-ray analysis (EDX). Pd4Co2Ir/C catalyst showed the highest activity and best stability making it the best potential candidate for application in a direct formic acid fuel cell (DFAFC). © 2008 Elsevier B.V. All rights reserved.
Current density; Electrocatalysts; Energy dispersive X ray analysis; Formic acid fuel cells (FAFC); Oxidation; Complexing agents; Organic colloid method; Sodium citrate; Formic acid