Electrooxidation of single-carbon molecules by nanostructured Pd-decorated spongy ceria
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Electrooxidation of single-carbon molecules by nanostructured Pd-decorated spongy ceria Zahra Yavari*,**,†, Mahdi Shafiee Afarani***, Amir Masoud Arabi****, and Meissam Noroozifar*****,† *Department of Chemistry, University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran **Renewable Energies Research Institute, University of Sistan and Baluchestan, Zahedan, Iran ***Department of Materials Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran ****Department of Inorganic Pigments and Glazes, Institute for Color Science and Technology (ICST), Tehran, Iran *****Department of Physical and Environmental Sciences, University of Toronto Scarborough 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada (Received 24 December 2019 • Revised 9 May 2020 • Accepted 11 May 2020) AbstractSolution combustion synthesis is proposed to fabricate spongy ceria by using two different fuels for combustion: glycine and urea. As-prepared samples are labeled as SCOGl and SCOUr. The acid-base properties of the cavities and surfaces of specimens are determined by measuring the pH of zero charges. Both SCOGl and SCOUr powders are decorated by the nanostructured Pd (NSPd) by the wetness incorporation. The NSPd-SCOGl and NSPd-SCOUr represent the high mass current density than NSPd as non-supported palladium for the electrooxidation of single-carbon molecules: methanol, formaldehyde and formic acid. The results show that the NSPd-SCOGl and NSPd-SCOUr are exceptional heterogeneous catalysts. The SCO as the support with porous structural network has been affected considerably on the electrochemical surface area, dispersion, and durability of NSPd. On the other hand, it can be effective for removing the poisoning species of the electrooxidation of single-carbon molecules on NSPd through the lattice oxygen, and the activation of an oxidation-reduction cycle between the high and low chemical valences of cerium, leading to improve the electrocatalytic efficiency of NSPd. Finally, it is confirmed the conversion of methanol to formaldehyde, and then to formic acid during electrooxidation by using cyclic voltammetry studies. Keywords: Single-carbon Molecules, Solution Combustion Synthesis, Methanol, Electrocatalyst, Cerium (IV) Oxide
fer from low utilization of noble metal, incomplete mass transportability, and the confined electrochemical stability of the carbonbased supports [14]. Hence, due to different properties like slight thermal conductivity, great thermal stability, and significant resistance to degradation for ceramic materials [15], they have attracted much attention to be available support for catalytic materials. The structural stability and feasibility of charge propagation are two key factors for the dispersion of noble metals in electrocatalysts in the support selection. Up to now, some ceramic structures are utilized in the catalytic electrooxidation of organic compounds, such as WO3 [16], TiO2 [7,17], SnO2 [18,
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