Effect of X zeolite-carbon composite ratio as support of Pt nanoparticles for MOR and ORR

• Published in: Ionics Vol. 27; no. 4; pp. 1813 - 1828
• Main Authors: Pérez-Díaz, P. J., Medina-Ramírez, A., Esquivel, I. R. Galindo, Ruiz, G. García, Ruiz-Camacho, B.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-04-2021; Springer Nature B.V
• Subjects: Chemical reduction; Chemical synthesis; Chemistry; Chemistry and Materials Science; Composite materials; Condensed Matter Physics; Electrochemistry; Energy Storage; Mass ratios; Nanoparticles; Optical and Electronic Materials; Platinum; Renewable and Green Energy; Short Communication; Sol-gel processes; Ultrasonic methods; Ultrasonic testing; X ray photoelectron spectroscopy; Zeolites; Zeolite-carbon; X zeolite; DMFC; Fuel cell; ORR
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-021-03922-4

X zeolite-carbon composites as Pt supports with different mass ratios of 3:1 (S1), 1:1 (S2), and 1:3 (S3) were synthesized by sol-gel method. The catalytic performance of Pt/composites for MOR and ORR was investigated and compared to Pt/X zeolite and Pt/C. Pt nanoparticles were prepared by ultrasound method via chemical reduction of Pt precursor with alcohol. The materials synthesized were characterized by XRD, nitrogen physisorption, TEM, SEM-EDS, and XPS. The structural, acidic, and textural properties of different supports demonstrated an effect on the Pt particle size, metal dispersion, Pt load, and Pt-support interaction. Pt/composites showed higher specific activity for MOR compared to Pt/C. Pt/S3 exhibited lower onset potentials, better stability, and an increment in the specific activity for MOR, which is 2.7, 2.0, and 2.9 higher than Pt/S1, Pt/S2, and Pt/C, respectively. For ORR, Pt/composite and Pt/C catalysts synthesized presented more tolerance to methanol than commercial Pt/C.