Abstract
Very active catalysts 40%Ir-10%V-3%W/C and 40%Ir-10%V-10%W/C, as a novel suitable anode catalyst in PEMFCs, have been synthesized by an ethylene glycol reduction method. The nanostructured catalysts have been characterized by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (TEM). Ir nanoparticles, after modification with V and further with W, show a narrow particle size distribution centered at 2 nm, and are uniformly dispersed on Vulcan XC-72. Investigation of the catalytic activity by means of linear sweep voltammetry (LSV) employing a rotating disk electrode (RDE) has revealed that 40%Ir-10%V-3%W/C catalyst exhibited very high electrocatalytic activity in terms of hydrogen oxidation reaction (HOR). About 76% higher current density was obtained for 40%Ir-10%V-3%W/C compared to that of 40%Pt/C except for 320% higher current density compared to that of the pure 40%Ir/C at 0.1 V versus RHE. The performance of a membrane electrode assembly (MEA) prepared with the 40%Ir-10%V-3%W/C as the anode catalyst generated a maximum power density of 625.9mW cm-2 at 0.59 V and 70 oC, which is 32% higher than that of commercial available 40%Pt/C.
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