Journal
ACS CATALYSIS
Volume 6, Issue 4, Pages 2654-2663Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b00525
Keywords
cerium oxide; nanocrystalline zeolite; electrocatalytic oxidation; methanol; fuel cell; bifunctional catalyst
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Funding
- Nano Mission, Department of Science and Technology, New Delhi, India [SR/NM-NS-1054/2015]
- CSIR, New Delhi, India
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Cerium oxide (CeO2) decorated nanocrystalline zeolite (Nano-ZSM-5) nanocomposites with different weight ratios were prepared by the calcination of a physical mixture of nanocrystalline CeO2 and Nano-ZSM-5. Materials were characterized by the complementary combination of Xray diffraction, N-2-adsorption, transmission electron microscopic, and X-ray photoelectron spectroscopic techniques. The material was investigated as a precious-metal-free electrode catalyst for methanol oxidation. The electrochemical oxidation of methanol was investigated at a CeO2/Nano-ZSM-5 modified glassy-carbon electrode in alkaline medium using electrochemical impedance spectroscopy, cyclic voltammetry, and chronoamperometry. Comparative investigations were made with commercial Pt(20%)/C catalyst with respect to current density, stability, and CO tolerance capacity. CeO2/Nano-ZSM-5 with a weight ratio of 30% exhibited remarkably high electrocatalytic activity in the methanol oxidation in comparison to nanocrystalline CeO2 and commercial Pt (20%)/C catalyst. The material was found to exhibit stable electrocatalytic activity even after 1000 cycles. High electrocatalytic activity in the methanol oxidation can be attributed to the synergistic contribution provided by CeO2 nanocrystals and Bronsted acidity of the high-surface-area Nano-ZSM-5. Results demonstrate that the excellent current density and high stability of CeO2/Nano-ZSM-5 would be valuable for its commercial application in direct methanol fuel cells.
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