Graphene–CeO2 hybrid support for Pt nanoparticles as potential electrocatalyst for direct methanol fuel cells

One Pot Synthesis of Pt/Graphene Composite Using Polyamidoamine/Chitosan as a Template and Its Electrocatalysis for Methanol Oxidation

“…This point can be proved by Pt 4f XPS spectra analysis. As shown in Figure 1D, the binding energy of Pt 4f for Pt/GNs (PAMAM) and Pt/GNs (CS) presents a positive shift due to the introduction of PAMAM and CS, which means that the interaction between Pt and support materials is much stronger than that of their corresponding counterpart Pt/GNs [27,29]. A higher binding energy would increase metal bond strength and reduce the potential of metal to form strong bonds with absorbed reactants, in favor of In addition, the enhanced catalytic activity may be ascribed to the superior electric conductivities of the as-synthesized composites, which can be proven by EIS analysis.…”

“…As shown in Figure 1D, the binding energy of Pt 4f for Pt/GNs (PAMAM) and Pt/GNs (CS) presents a positive shift due to the introduction of PAMAM and CS, which means that the interaction between Pt and support materials is much stronger than that of their corresponding counterpart Pt/GNs [27,29]. A higher binding energy would increase metal bond strength and reduce the potential of metal to form strong bonds with absorbed reactants, in favor of removing the strongly adsorbed CO-like species during MOR [29]. Secondly, the protonated NH 3 + groups or -OH groups can enhance the hydrophilic properties of RGO to promote water activation [16], and as a result, the adsorbed OH− species at the surface of Pt particles promote the oxidation of CO [30].…”

“…ThenHRTEM image in Figure 2C presents the details fringes of Pt for Pt/GNs (PAMAM). The lattice fringes with a d-spacing of 0.226 nm is attributed to the spacing of the (111) planes in face-centered cubic (fcc) Pt [28,29], which further suggests the zero-valent state of Pt and high crystallinity of Pt nanoparticles. Figure 2D,E show the Pt nanoparticles of Pt/GNs (CS) are highly dispersed on the surface of GNs, mainly in the form of spherical particles.…”

Graphene based Electrocatalysts for DMFCs

“…It has been concluded that the largest ESA and I F /I R ratio with the CeO 2 content of 7 wt% had the best performance as compare to the other catalysts for the oxidation of methanol [8].…”

“…After this 30 mg of H2PtCl6 was added, and set the pH of the solution to 9 with the addition of potassium hydroxide drop wise. Then stirred the mixture for 4 hours at 90ºC and Pt-CeO2/GN electrocatalyst was collected [8]. Pt-SiO2/Graphene nanocomposites was synthesized using solvothermal method, graphene oxide was prepared by modified Hummer's method.…”