Year-end Sale % OFF 
Abstract
The effect of the addition of three oxophilic co-metals (Sn, Mo and Re) on the electrochemical performance of Pd in the ethanol oxidation reaction (EOR) was investigated by performing half-cell and membrane-less electrolysis cell experiments. While the additions of Sn and Re were found to improve significantly the EOR performance of Pd, Mo produced no significant promotional effect. When added in significant amounts (50:50 ratio), Sn and Re produced a 3–4 fold increase in the mass-normalized oxidation peak current as compared to the monometallic Pd/C material. Both the electrochemical surface area and the onset potential also improved upon addition of Sn and Re, although this effect was more evident for Sn. Cyclic voltammetry (CV) measurements revealed a higher ability of Sn for accommodating OH- species as compared to Re, which could explain these results. Additional tests were carried out in a membrane-less electrolysis system. Pd50Re50/C and Pd50Sn50/C both showed higher activity than Pd/C in this system. Chronopotentiometric measurements at constant current were carried out to test the stability of both catalysts in the absence of a membrane. Pd50Sn50/C was significantly more stable than Pd50Re50/C, which showed a rapid increase in the potential with time. Despite operating in the absence of a membrane, both catalysts generated a high-purity (e.g., 99.99%) hydrogen stream at high intensities and low voltages. These conditions could lead to significant energy consumption savings compared to commercial water electrolyzers.
Highlights
The reduction of anthropogenic carbon dioxide emissions is a priority worldwide.most of the energy consumed is currently supplied by fossil fuels, which inevitably results in growing concentrations of carbon dioxide in the atmosphere
Electrochemical reforming of alcohols has demonstrated potential for producing pure hydrogen at lower potentials than those required for water electrolysis, thereby allowing significant energy savings [5,6]
The addition of Re to Pt/C and Pt-Sn/C catalysts improved the ethanol electrooxidation activity of these materials, and this was ascribed to the ability of Re to promote C–C breaking of intermediates adsorbed on the noble metal [36]
Summary
The reduction of anthropogenic carbon dioxide emissions is a priority worldwide. most of the energy consumed is currently supplied by fossil fuels, which inevitably results in growing concentrations of carbon dioxide in the atmosphere. OHads species, it has demonstrated significant activity to promote C–C cleavage of oxygenated molecules such as glycerol when combined with Pt [36] In this sense, the addition of Re to Pt/C and Pt-Sn/C catalysts improved the ethanol electrooxidation activity of these materials, and this was ascribed to the ability of Re to promote C–C breaking of intermediates adsorbed on the noble metal [36]. Pd in alkaline media (mostly activity and stability) These effects were compared with those produced by a more common and well-known additive such as Sn. The structures of the bimetallic catalysts prepared were studied by X-ray diffraction (XRD), and their electrooxidation performances were evaluated by cyclic voltammetry (CV) measurements via half-cell experiments. Chemical or electrochemical failures produced by membrane degradation while reducing the capital costs of these devices [37,38,39]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
