Multifunctional catalysts toward methanol oxidation in direct methanol fuel cell

Abstract

In the current study, a nanoscale perovskite SrFeO 3 (SrFNPs) was synthesized by a rapid microwave-assisted co-precipitation method and characterized by X-ray diffraction, Fourier transform-infrared spectroscopy, scanning electron microscopy, Energy dispersive X-ray, and vibrating sample magnetometer techniques. Modified glassy carbon electrode with Pt nanoparticles (PtNPs), functionalized carbon nanotubes (CNTs), and SrFNPs as multifunctional catalyst is prepared and its catalytic activity toward methanol oxidation is investigated. Based on the electrochemical studies, a PtNPs-CNTs-SrFNPs nanocomposite was shown a considerable activity for methanol oxidation in comparison of PtNPs, PtNPs-CNTs, and PtNPs-SrFNPs. A direct methanol fuel cell was designed, assembled, and tested with suggested PtNPs-CNTs-SrFNPs nanocomposites under several different conditions. The effect of some experimental factors such as temperature, methanol concentration, and flow rate as well as NaOH concentration on electrical performances of fuel cell were studied and optimized.

Palladized dysprosium fluoride nanorods as a new performance catalyst in direct methanol fuel cell

“…Lower I f / I b value illustrated that the catalyst has high accumulation of intermediate on its surface, so the catalyst does not have acceptable activity for methanol oxidation . According to Figure B, this ratio for the DyFNRs/MWCNTs‐PdNP catalyst was estimated about 3, and this value is more than most of our previous works using PdNPs‐CuNPs/G catalyst, MWCNT‐PtNPs‐SrFNPs‐CH, GC/PdNPs‐LaNi 0.5 Fe 0.5 O 3 NPs, PtNPs/NTs‐LaMnO 3 NPs, and Pt/CNT‐LaFeO 3 NPs with I f / I b 2.32, 1.2, 1.9, 1.29, and 2.13, respectively. In other words, the suggested catalyst demonstrated higher performance in oxidation of methanol, and it is more powerful in the exposure of carbon monoxide.…”

Deposition of PdPtAu Nanoparticles on Hollow Nanospheres of Fe3O4 as a New Catalyst for Methanol Electrooxidation: Application in Direct Methanol Fuel Cell

“…Based on Figure A, this ratio for the Fe 3 O 4 HNS‐PdPtAuNPs catalyst was calculated about 5.3. The ratio of I f / I b for the Fe 3 O 4 HNS‐PdPtAuNPs is higher than our provirus works using Pd‐Cu/G catalyst , MWCNT−PtNPs−SrFNPs−CH , GC/PdNPs‐LaNi 0.5 Fe 0.5 O 3 NPs , PtNPs/NTs‐LaMnO 3 NPs , Pt/CNT‐LaFeO 3 NPs , GC/PdNPs with I f / I b of 2.32, 1.2, 1.9, 1.29, 2.13 and 5.25, respectively. Accordingly, the proposed catalyst has lower intermediate accumulation showing better efficiency in methanol oxidation and more tolerance against carbon monoxide.…”

The improvement of methanol oxidation using nano-electrocatalysts

“…The high dispersion of the PtNPs on the CNTs supports was achieved this mechanism: surface functional groups such as hydroxyl, carboxyl and carbonyl groups on the CNTs were effectively produced during the chemical oxidation treatment and they had assisted at the ion adsorption and metal deposition by serving as specific nucleation sites for PtNPs. [20] The PtNPs dispersion (D Pt ) was termed as the fraction of surface-active Pt atoms in all of Pt atoms can be achieved [21]:…”