Direct methanol fuel cell (DMFCs) is one of the best positioned toward widespread commercialization and the most viable alternative to lithium-ion batteries for portable applications. A major drawback of this technology is in large part related to the dependence on Pt-based electrocatalysts for methanol oxidation reaction (MOR) at the anode. To address this issue, low-Pt electrocatalysts are desired for keeping high performance of MOR. In this article, tungsten carbide (WC) enhanced trimetallic AuPdPt nanocomposite was prepared through the two-step method, i) intermittent microwave heating method (IMH) and ii) direct chemical reduction method. Trimetallic AuPdPt nanoparticles are dispersed well on the nanostructured WC, confirmed by scanning electron microscopy (SEM), energy X-ray diffraction spectroscopy (EDX), and transmission electron microscopy (TEM). The electrocatalytic performance of the as-synthesized nanocomposite for MOR was tested using cyclic voltammetry and chronopotentiometry in alkaline media. The results revealed that the WC enhanced trimetallic AuPdPt nanocomposites has better performance of MOR and stability than that of commercial Pt/C catalyst.
Nano-tungsten carbide was prepared by intermittent microwave heating method (IMH) in this study. IMH has many advantages such as heating uniformity, rapid increase of temperature in heating. The method is easy to control. AuPdPt-WC/C was prepared by direct chemical reduction. The electrocatalysts are characterized by XRD, SEM, EDX, linear sweeping voltammetry and electrochemical impedance spectroscopy (EIS) for the HER in the acidic media. The results show that the AuPdPt-WC/C electrocatalyst has higher activity and stability in acidic solution compared to the Pt-WC/C electrocatalyst, and AuPdPt-WC/C electrocatalyst performs a lower overpotential and a higher exchange current density. In addition, the catalytic HER performance of AuPdPt-WC/C electrocatalyst is improved dramatically. When the mass ratio of Au:Pd:Pt:WC is 1:1:2:1, the composite electrocatalyst shows the best catalytic activity of the HER. Kinetic study shows that the HER on the AuPdPt-WC/C electrocatalyst gives a lower overpotential in 2.0 mol L −1 H 2 SO 4 solution. When the temperature changed from 313 K to 323 K, the hydrogen evolution performance can also be enhanced.
Facile synthesis of molybdenum carbide nanoparticles in situ decorated on nitrogen-doped porous carbons for hydrogen evolution reaction
Direct methanol fuel cell (DMFCs) is one of the best positioned toward widespread commercialization and the most viable alternative to lithium-ion batteries for portable applications. A major drawback of this technology is in large part related to the dependence on Pt-based electrocatalysts for methanol oxidation reaction (MOR) at the anode. To address this issue, low-Pt electrocatalysts are desired for keeping high performance of MOR. In this abstract, trimetallic AuPdPt nanocomposites supported on the tungsten carbide (WC) was prepared through two-step method, i) intermittent microwave heating method (IMH) and ii) direct chemical reduction method. Trimetallic AuPdPt nanoparticles are dispersed well on the nanostructured WC, confirmed by scanning electron microscopy (SEM), energy X-ray diffraction spectroscopy (EDX), and transmission electron microscopy (TEM). The electrocatalytical performance of the as-synthesized nanocomposite for MOR was tested using cyclic voltammetry and chronopotentiometry in alkaline media. The results revealed that the WC enhanced trimetallic AuPdPt nanocomposites has better performance of MOR and stability than that of commercial Pt/C catalyst. Alloying strategy and the introduction of WC support are good choices for preparation of MOR electrocatalysts with low loading of Pt.
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