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Ordered Mesoporous Carbon as a Support of Pd Catalysts for CO2 Electrochemical Reduction

AuthorsPérez Rodríguez, Sara; Pastor Tejera, Elena; Lázaro Elorri, María Jesús
KeywordsHard templating
Ordered mesoporous carbons
CO2 electroreduction
Issue Date2020
PublisherMultidisciplinary Digital Publishing Institute
CitationCatalysts 10(8): 912 (2020)
AbstractOrdered mesoporous carbons (OMCs) have been used as catalyst supports of Pd nanoparticles for the electrochemical reduction of CO2 in 0.1 M KHCO3. OMC with tunable porosity and morphology were obtained by the hard-template approach using synthesized SBA-15 templates. SBA-15 materials were prepared using a mass ratio of the silica precursor (TEOS) and the surfactant (P123) of 2 or 5. After removing silica particles by a purification treatment with NaOH-ethanol or HF, different OMCs were obtained, with a developed porosity (up to 1050 m2 g−1) and ordered 2D hexagonal mesostructure (p6 mm). An increase in the TEOS/P123 ratio as well as the treatment with HF resulted in a decrease in the structural ordering of the materials. Pd nanoparticles with an average size of around 3 nm were deposited on the OMC. However, larger nanoparticles were also observed, especially for the materials obtained using a mass ratio TEOS/P123 of 5. Despite these differences, electrochemical experiments showed that CO2 was successfully reduced to other species (mainly COad) for all Pd/OMC electrocatalysts. These reduced species were adsorbed on Pd active sites, inhibiting the hydrogen evolution reaction
Description© 2020 by the authors.
Publisher version (URL)https://doi.org/10.3390/catal10080912
Appears in Collections:(ICB) Artículos
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