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Received December 24, 2019
Accepted May 11, 2020
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Electrooxidation of single-carbon molecules by nanostructured Pd-decorated spongy ceria

1Department of Chemistry, University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran 2Renewable Energies Research Institute, University of Sistan and Baluchestan,, Zahedan, Iran 3Department of Materials Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran 4Department of Inorganic Pigments and Glazes, Institute for Color Science and Technology (ICST), Tehran, Iran 5Department of Physical and Environmental Sciences, University of Toronto Scarborough 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
Korean Journal of Chemical Engineering, October 2020, 37(10), 1669-1679(11), 10.1007/s11814-020-0571-9
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Abstract

Solution 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.

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