Effect of annealing on phase sequence and their composition in the Pt-coated Mo system

Khumalo, Z.M.; Topić, M.; Comrie, C.M.; Blumenthal, M.; Pineda-Vargas, C.A.; Bucher, R.; Kisslinger, Kim

doi:10.1016/j.nimb.2014.07.029

Cited by 2 publications

(1 citation statement)

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“…At RT, the XRD patterns of PtMo/C-800 and Pt/C-800 matched well with the fcc Pt phase, indicating that PtMo/C-800 was made up of a single fcc-Pt-Mo solid-solution phase without any impurities (Figure 1b). 36,37 Furthermore, high-resolution transmission electron microscopy (HRTEM) images and fast Fourier transform (FFT) patterns of Pt/C-800 and PtMo/C-800 illustrate the lattice spacings indexed for the (222) and (111) plane group of the cubic Pt phase, respectively, implying that introducing Mo does not affect the crystal structure or lattice parameter owing to their similar atomic radii (Pt: 138.5 pm; Mo: 139 pm) (Figures 1c,d and S2). EDS elemental mapping under STEM was performed to investigate the distribution of Pt and Mo atoms in PtMo/C-800 (Figure 1e− g).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Gas-Phase Synthesis of PtMo Alloy Electrocatalysts with Enhanced Activity and Durability for Oxygen Reduction Reaction

Hyun-seok

Song

et al. 2022

ACS Sustainable Chem. Eng.

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The proton-exchange membrane fuel cell is a promising technology to effectively utilize hydrogen energy, which is the ideal alternative to fossil fuels. However, the high dependency on scarce Pt as an oxygen reduction reaction (ORR) electrocatalyst is still a severe barrier that hinders widespread commercialization. Herein, we propose a facile synthetic strategy facilitating mass production of Pt–Mo solid-solution alloy nanoparticles on a carbon support (PtMo/C) as a highly active ORR electrocatalyst. Without using organic surfactants or reducing agents, our synthesis process based on the gas-phase method in an inert atmosphere is cost-effective and does not require any post-treatment, unlike most reported solution-based reduction processes. Both molybdenum metal and carbon monoxide decomposed from molybdenum hexacarbonyl contribute to the reduction of the PtMo alloy during the annealing process. By elucidating the growth and synthesis mechanisms, we optimized the particle size of PtMo/C to approximately 3.1 nm, annealed at 800 °C (PtMo/C-800). Consequently, PtMo/C-800 shows high mass activity (146 mA mgPt –1), which is superior to that of commercial Pt/C, and excellent durability after accelerated degradation tests.

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Section: ■ Results and Discussionmentioning

confidence: 99%