Highly Stable and Active Pt−Cu Oxygen Reduction Electrocatalysts Based on Mesoporous Graphitic Carbon Supports
Citations Over TimeTop 10% of 2009 papers
Abstract
The activity of oxygen reduction catalysts for fuel cells often decreases markedly (30−70%) during potential cycling tests designed to accelerate catalyst degradation. Herein we achieved essentially no loss in electrochemical surface area and catalyst activity during potential cycling from 0.5 to 1.2 V for presynthesized Pt−Cu nanoparticles of controlled composition that were infused into highly graphitic disordered mesoporous carbons (DMC). The high stability is favored by the strong metal−support interactions and low tendency for carbon oxidation, which mitigates the mechanisms of degradation. Electrochemical dealloying transforms the composition from Pt20Cu80 to Pt85Cu15 with a strained Pt-rich shell, which exhibits an enhanced ORR activity of 0.46 A/mgPt, >4 fold that of pure Pt catalysts. The high uniformity in particle size and composition both before and after dealloying, as a consequence of the presynthesis/infusion technique, is beneficial for elucidating the mechanism of catalyst activity and, ultimately, for designing more active catalysts.
Related Papers
- → Catalytic Application of Mesoporous ZSM-5 Zeolite(2014)19 cited
- → Synthesis of mesoporous ceria without template(2013)17 cited
- → Mesoporous Solid Acid Catalysts(2010)25 cited
- Synthesis,Characterization and Catalytic Properties of Mesoporous Materials with Loading of TS-1 Precursors(2004)
- Research Progress of Strongly Acidic Mesoporous Materials(2009)