am6b13840_si_001.pdf (6.54 MB)
Nanoporous Platinum/(Mn,Al)3O4 Nanosheet Nanocomposites with Synergistically Enhanced Ultrahigh Oxygen Reduction Activity and Excellent Methanol Tolerance
journal contribution
posted on 2017-01-05, 00:00 authored by Conghui Si, Jie Zhang, Ying Wang, Wensheng Ma, Hui Gao, Lanfen Lv, Zhonghua ZhangAt
present, metal/metal oxide composites are considered as potential
oxygen reduction reaction (ORR) catalysts for energy-related applications
like fuel cells. Here, we fabricated a high-activity, low Pt loading
ORR electrocatalyst composed of nanoporous Pt (np-Pt) in intimate
contact with lamellar (Mn,Al)3O4 nanosheet (NS).
In comparison to Pt/C (Johnson Matthey), the np-Pt/(Mn,Al)3O4 NS catalyst shows a 11.5-fold enhancement in the mass-normalized
ORR activity and much better methanol tolerance because of the metal–support
interactions between np-Pt and (Mn,Al)3O4. Furthermore,
the combination of electrochemical experiments with theoretical calculations
verifies that the ORR on the np-Pt/(Mn,Al)3O4 NS catalyst is a direct 4e– pathway in the alkaline
solution. In addition, the electrocatalytic mechanisms have also been
rationalized by density functional theory (DFT) calculations.
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calculations verifiesfuel cellsSynergistically Enhanced Ultrahigh Oxygen Reduction Activityelectrocatalytic mechanismsmass-normalized ORR activityExcellent Methanol ToleranceMnoxygen reduction reactionenergy-related applicationsNSDFTnanoporous PtPt loading ORR electrocatalystmethanol toleranceelectrochemical experimentsnp-Pt
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