Lanthanum-based double perovskite nanoscale motifs as support media for the methanol oxidation reaction
Journal Article
·
· Catalysis Science and Technology
- State Univ. of New York (SUNY), Stony Brook, NY (United States)
- Fordham Univ., Bronx, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
In this report we have not only analyzed the performance of perovskite oxides as support media for the methanol oxidation reaction (MOR) but also examined the impact and significance of various reaction parameters on their synthesis. Specifically, we have generated (a) La2NiMnO6, LaMnO3, and LaNiO3 nanocubes with average sizes of ~200 nm, in addition to a series of La2NiMnO6 (b) nanocubes possessing average sizes of ~70 and 400 nm and (c) anisotropic nanorods characterized by average diameters of 40-50 nm. All of these samples, when used as supports for Pt nanoparticles, exhibited activities which were at least twice that measured for Pt/C. We have investigated and correlated the effect of varying perovskite (i) composition, (ii) size, and (iii) morphology upon the measured MOR activity. (i) The Ni-containing perovskites yielded generally higher performance metrics than LaMnO3 alone, suggesting that the presence of Ni is favorable for MOR, a finding supported by a shift in the Pt d-band in XPS. (ii) MOR activity is enhanced as the perovskite size increases in magnitude, suggesting that a growth in the perovskite particle size enables favorable, synergistic metal–support interactions. (iii) A comparison of the nanorods and nanocubes of a similar diameter implied that the one-dimensional morphology achieved a greater activity, a finding which can be attributed not only to the anisotropic structure but also to a desirable surface structure. Overall, these data yield key insights into the tuning of metal–support interactions via rational control over the composition, size, and morphology of the underlying catalyst support.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1855754
- Alternate ID(s):
- OSTI ID: 1835343
- Report Number(s):
- BNL-222868-2022-JAAM
- Journal Information:
- Catalysis Science and Technology, Journal Name: Catalysis Science and Technology Journal Issue: 2 Vol. 12; ISSN 2044-4753
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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