High performance rare earth oxides LnO<subscript> x </subscript> (Ln=Sc, Y, La, Ce, Pr and Nd) modified Pt/C electrocatalysts for methanol electrooxidation
In: Journal of Power Sources, Jg. 162 (2006-11-22), Heft 2, S. 1067-1072
academicJournal
Zugriff:
Abstract: In this paper, the LnO x (Ln=Sc, Y, La, Ce, Pr and Nd) modified Pt/C catalysts were prepared by wet precipitation and reduction method. The catalysts were characterized by transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD). TEM showed that the Pt-PrO x nanoparticles were uniformly dispersed on carbon with an average particle size of 5.0nm in the Pt3-(PrO x )1/C catalyst. EDX showed that Pt and Pr were successfully loaded on the carbon support without obvious loss. XRD showed that all the Pt/C and LnO x modified Pt/C electrocatalysts (except for the Pt3-(ScO x )1/C electrocatalyst) displayed the typical character of Pt face centered cubic (fcc) phase, whereas the Pt3-(ScO x )1/C electrocatalyst contained the diffraction pattern of Pt face centered cubic and Sc2O3 phase. LnO x modified Pt/C electrocatalysts were compared with Pt/C in terms of the electrochemical activity and stability for methanol electrooxidation using cyclic voltammetry (CV) and chronoamperometry (CA) in 0.5M H2SO4 +0.5M CH3OH solutions. The results showed that all the LnO x (except for NdO x ) modified the Pt/C electrocatalysts gave higher catalytic activity and stability than Pt/C. In particular, the Pt3-(PrO x )1/C eloctrocatalyst was found to be superior than others. Under this respect, several Pt-PrO x /C catalysts with different atomic ratio of Pt/Pr were also identically prepared and characterized. It was found by CV and CA that the Pt3-(PrO x )1/C and Pt1-(PrO x )1/C catalysts showed better catalytic activity and stability than the Pt5-(PrO x )1/C, Pt1-(PrO x )3/C and Pt/C catalysts. The Pt3-(PrO x )1/C and Pt1-(PrO x )1/C catalysts had high catalytic activity and good stability, which could be used as novel electrocatalysts for direct methanol fuel cell. [Copyright &y& Elsevier]
Titel: |
High performance rare earth oxides LnO<subscript> x </subscript> (Ln=Sc, Y, La, Ce, Pr and Nd) modified Pt/C electrocatalysts for methanol electrooxidation
|
---|---|
Autor/in / Beteiligte Person: | Tang, Zhicheng ; Lu, Gongxuan |
Link: | |
Zeitschrift: | Journal of Power Sources, Jg. 162 (2006-11-22), Heft 2, S. 1067-1072 |
Veröffentlichung: | 2006 |
Medientyp: | academicJournal |
ISSN: | 0378-7753 (print) |
DOI: | 10.1016/j.jpowsour.2006.07.052 |
Schlagwort: |
|
Sonstiges: |
|