PtFeCu Concave Octahedron Nanocrystals as Electrocatalysts for the Methanol Oxidation Reaction

Abstract

In this work, PtFeCu concave octahedron nanocrystals were synthesized by a one-pot solvothermal method. The PtFeCu concave octahedron nanocrystals were applied as an electrocatalyst for the electrooxidation of methanol and have shown high electrocatalytic activity and long-term durability. The electrocatalysis performances of the PtFeCu concave octahedron nanocrystals are better than those of the PtFe and PtCu nanocrystals and commercial Pt/C. The synergistic effect of the Pt, Fe, and Cu metals and the unique concave octahedron morphology may be the main cause of the superior electrocatalytic performances of the PtFeCu nanocrystals. The PtFeCu concave octahedron nanocrystals have a potential application as an anode catalyst for direct methanol fuel cells.

Pt1(CeO2)0.5 Nanoparticles Supported on Multiwalled Carbon Nanotubes for Methanol Electro-oxidation

“…To overcome these issues, Pt-based alloyed catalysts, including bimetallic alloy [PtM (M = Er, Pr, Ce, Dy, Tb, Nd, Ho, etc. ), Pt/MO 2 (M = Ce, Pr, Nd, and Sm), PtRh, , PtCu, , and PtNi , ], ternary alloy (PtFeCu, PtCuRu, PtCuBi, PtCuCo, and PtCuPd), and quaternary alloy (PtCuCoNi, PtCoNiMo, and PtRuFeCo) catalysts, were prepared. Particularly, catalysts mixed with CeO 2 have received wide attention.…”

Cubic-like PtCuRu Nanocrystals with High Activity and Stability for Methanol Electro-oxidation

“…Generally, the ratio of the forward peak current of methanol electro-oxidation (I f ) to the backward peak current (I b ) could be employed to evaluate the poisoning tolerance of the catalysts to the intermediates. 18 As calculated, the I f /I b values for the PtCu, PtCuRu, and Pt/C were 1.68, 1.71, and 0.93, respectively, suggesting a large increase of the antipoisoning performance for PtCu and PtCuRu nanocrystals. In addition, the electrooxidation of CO was performed to study the antipoisoning ability of the catalysts after methanol electro-oxidation.…”

“…In addition, it was widely discovered that pure Pt catalysts are easily poisoned by the harmful intermediates adsorbed on the surfaces, and, however, the synergistic effect of Pt and Cu as well as Ru in the PtCuRu nanocrystals favored the C–H bond cleavage and facilitated the elimination of poisonous molecules during methanol oxidation. Generally, the ratio of the forward peak current of methanol electro-oxidation ( I f ) to the backward peak current ( I b ) could be employed to evaluate the poisoning tolerance of the catalysts to the intermediates . As calculated, the I f / I b values for the PtCu, PtCuRu, and Pt/C were 1.68, 1.71, and 0.93, respectively, suggesting a large increase of the antipoisoning performance for PtCu and PtCuRu nanocrystals.…”

“…For example, the alloying of highly oxophilic metals such as Ru and Ni to Pt has been evidenced to be the efficient method to increase the antipoisoning ability, resulting from bifunctional mechanisms and the ligand effect. Especially, the presence of the Ru species in the Pt catalysts can supply the adsorbed hydroxyl groups (OH ads ), which could oxidize the poisoning species from methanol at a lower potential, which is beneficial for eliminating the intermediates during methanol oxidation. − In addition, because of the reduction of the d band energy of Pt, the introduction of metallic Cu has been proved to promote the catalytic performance of the alloying Pt catalyst. Accordingly, PtCu nanoalloys with different structures and compositions have been well investigated as catalysts for methanol electro-oxidation.…”

Surfactant-Free Monodispersed Pd Nanoparticles Template for Core-Shell Pd@PdPt Nanoparticles as Electrocatalyst towards Methanol Oxidation Reaction (MOR)

“…However, a large amount of Pt is required for a practical activity with high costs that hinders the commercialization of PEMFCs. In the literature, researchers have been devoted to developing electrocatalysts with improved Pt use and enhanced catalytic activity [19][20][21][22]. Among them, palladium-platinum (PdPt) electrocatalysts have received considerable interest recently as Pd costs much less than Pt (one-quarter of Pt).…”