Highly Efficient CeO₂ Decorated Nano-ZSM‑5 Catalyst for Electrochemical Oxidation of Methanol

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 X-ray diffraction, N₂-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 Brønsted 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

Additional file 1: of Cytosolic phospholipase A2 (cPLA2) IVA as a potential signature molecule in cigarette smoke condensate induced pathologies in alveolar epithelial lineages

Supplementary data. Table S1. Primer Sequences of various genes. Table S2. CSC-induced mRNA expression of various cPLA2 groups in A-549 and WI-26 Cells. The values (mean ± SD of three different experiments) are in folds of control values. Figure S1. Schematic presentation of proposed plan of experimental design. Figure S2. Effect of CSC treatment at concentrations’ of 150 μg/ml (b) and 200 μg/ml (c) on cell morphology in lung epithelial type II (A-549) cells and type I (WI-26) cells. Figure 2a shows the normal morphology in two types of the cells (Magnification 5x). (DOCX 1098 kb